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Application of computational fluid dynamics in design of viscous dampers-CFD modeling and full-scale dynamic testing 认领 引用 被引量：2
1
作者 Hassan Lak Seyed Mehdi Zahrai +1 位作者 Seyed Mohammad Mirhosseini Ehsanollah Zeighami 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2023年第4期1065-1080,共16页
Computational fluid dynamics(CFD)provides a powerful tool for investigating complicated fluid flows.This paper aims to study the applicability of CFD in the preliminary design of linear and nonlinear fluid viscous dam... Computational fluid dynamics(CFD)provides a powerful tool for investigating complicated fluid flows.This paper aims to study the applicability of CFD in the preliminary design of linear and nonlinear fluid viscous dampers.Two fluid viscous dampers were designed based on CFD models.The first device was a linear viscous damper with straight orifices.The second was a nonlinear viscous damper containing a one-way pressure-responsive valve inside its orifices.Both dampers were detailed based on CFD simulations,and their internal fluid flows were investigated.Full-scale specimens of both dampers were manufactured and tested under dynamic loads.According to the tests results,both dampers demonstrate stable cyclic behaviors,and as expected,the nonlinear damper generally tends to dissipate more energy compared to its linear counterpart.Good compatibility was achieved between the experimentally measured damper force-velocity curves and those estimated from CFD analyses.Using a thermography camera,a rise in temperature of the dampers was measured during the tests.It was found that output force of the manufactured devices was virtually independent of temperature even during long duration loadings.Accordingly,temperature dependence can be ignored in CFD models,because a reliable temperature compensator mechanism was used(or intended to be used)by the damper manufacturer. 展开更多
关键词 fluid viscous damper passive control dynamic testing energy dissipation device computational fluid dynamic thermography
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High-frequency interference waves in low strain dynamic testing of X-section concrete piles 认领 引用 被引量：1
2
作者 Qu Liming Fan Yuming +2 位作者 Ding Xuanming Yang Changwei Zhang Yanling 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2021年第4期877-885,共9页
Stress waves propagate along vertical,radial and circumferential directions when a non-uniformly distributed load is applied at one end of a three-dimensional shaft.As a result,the receiving signals are usually mixed ... Stress waves propagate along vertical,radial and circumferential directions when a non-uniformly distributed load is applied at one end of a three-dimensional shaft.As a result,the receiving signals are usually mixed with undesired interference components,often featuring as high-frequency fluctuations.Previous studies have revealed that sectional geometry(shape and size)greatly affects the high-frequency interference.In this study,low strain dynamic testing on full-scale X-section concrete is conducted in order to investigate the influences of high-frequency interference on velocity responses at the pile head.Emphasis is placed on the frequency and peak value of interference waves at various receiving points.Additionally,the effects of the geometrical,and mechanical properties of the pile shaft on high-frequency interference are elaborated on through the three-dimensional finite element method.The results show that the measured wave is obscured by interference waves superposed by two types of high-frequency components.The modulus and cross-sectional area are contributing factors to the frequency and peak value of the interference waves.On the other hand,the position with the least interference is determined,to some extent,by the accurate shape of the X-section. 展开更多
关键词 low strain dynamic testing X-section concrete pile high-frequency interference full-scale model test finite element method
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Control system for dynamic testing platform of asymmetrical pitch mechanism 认领 引用
3
作者 李恒宇 罗均 +1 位作者 谢少荣 郝山波 《Journal of Shanghai University(English Edition)》 2009年第4期276-278,共3页
A novel asymmetrical pitch system for rotary wing is presented. The pitch control characteristics are studied and analyzed. Because elastic linkage is a key part in whole asymmetrical pitch system, in order to obtain ... A novel asymmetrical pitch system for rotary wing is presented. The pitch control characteristics are studied and analyzed. Because elastic linkage is a key part in whole asymmetrical pitch system, in order to obtain the variation of the elastic linkage deformation, an experimental platform mainly based on the device of micro aerial vehicles （MAVs） and a new control system mounted on TMS320LF2407 are designed. This control system has its compacted configuration and reliability. Finally, using this system to control the MAV for simulating the flying forward, experimental results show the MAV＇s flight attitude can he controlled based on the variation of the elastic linkage. 展开更多
关键词 asymmetrical pitch micro aerial vehicle （MAV） experimental system dynamic testing platform
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Performance of identical rockbolts tested on four dynamic testing rigs employing the direct impact method 认领 引用 被引量：3
4
作者 Charlie C.Li John Hadjigeorgiou +5 位作者 Peter Mikula Greig Knox Bradley Darlington Renee Royer Andrzej Pytlik Michael Hosp 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2021年第4期745-754,共10页
Impact drop tests are routinely used to examine the dynamic performance of rockbolts.Numerous impact tests have been carried out in the past decades on independently designed,constructed and operated testing rigs.Each... Impact drop tests are routinely used to examine the dynamic performance of rockbolts.Numerous impact tests have been carried out in the past decades on independently designed,constructed and operated testing rigs.Each laboratory has developed testing procedures;thus,the results are often reported in different ways by various laboratories.The inconsistency in testing procedures and reporting formats presents a challenge when comparing results from different laboratories.A series of impact tests of identical rockbolts was carried out using the direct impact method(i.e.the mass free-fall method)on the rigs in four laboratories in different countries.The purpose of these tests was to investigate the level of consistency in the results from the four rigs.Each rig demonstrated a high level of repeatability,but differences existed between the various rigs.The differences would suggest that there is noticeable equipment-dependent bias when test results obtained from different laboratories are compared.It was also observed that the energy dissipated for the plastic displacement of the bolt was smaller than the impact energy in the tests.The average impact load(AIL)and the ultimate plastic displacement(D)of the bolt describe the ultimate dynamic performance of the bolt.In the case where the bolt does not rupture,the specific plastic energy(SPE)is an appropriate parameter in describing the impact performance of the bolt.Two other relevant parameters are the first peak load(FPL)and the initial stiffness(K)of the bolt sample.The information from this test series will guide the formulation of standardised testing procedures for dynamic impact tests of rockbolts. 展开更多
关键词 Dynamic test Drop test Impact test Rockbolt Rock reinforcement Ground support
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Networked collaborative pseudo-dynamic testing of a multi-span bridge based on NetSLab 认领 引用 被引量：1
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作者 Cai Xinjiang Tian Shizhu +1 位作者 Wang Dapeng Xiao Yan 《Earthquake Engineering and Engineering Vibration》 SCIE EI 2009年第3期387-397,共11页
Modem dynamic tests such as networked collaborative pseudo-dynamic testing （PDT） provide new tools to study the dynamic performance of large and complex structures. In this paper, several networked collaborative PDT... Modem dynamic tests such as networked collaborative pseudo-dynamic testing （PDT） provide new tools to study the dynamic performance of large and complex structures. In this paper, several networked collaborative PDT systems established in China and abroad are introduced, including a detailed description of the first networked collaborative platform that involved the construction of a standardized demonstration procedure for networked collaborative PDT. The example is a multi-span bridge with RC piers retrofitted by FRP, and a networked structural laboratory （NetSLab） platform is used to link distributed laboratories located at several universities together. Substructure technology is also used in the testing. The characteristics, resource sharing and collaborative work of NetSLab are described, and the results illustrate that use of the NetSLab is feasible for studying the dynamic performance of multi-span bridge structures. 展开更多
关键词 dynamic tests networked pseudo-dynamic testing multi-span bridges RC short piers FRP NetSLab
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Dynamic Testing of Elastic Modulus,Shear Modulus,and Poisson’s Ratio of Bamboo Scrimber 认领 引用
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作者 Xiaoyu Gu Linbi Chen +2 位作者 Seithati Mapesela Zheng Wang Aijin Zhou 《Journal of Renewable Materials》 SCIE EI CAS 2023年第12期4197-4210,共14页
The bamboo scrimber is an anisotropic material.The elastic constant values of the bamboo scrimber specimens measured by the dynamic and static methods are consistent,and the dynamic test method has the advantages of r... The bamboo scrimber is an anisotropic material.The elastic constant values of the bamboo scrimber specimens measured by the dynamic and static methods are consistent,and the dynamic test method has the advantages of rapidity,simplicity,good repeatability,and high precision.Bamboo scrimber has strong potential as a building material,and its elastic constant is an important index to measure its mechanical properties.To quickly,simply,non-destructively,and accurately detect the elastic constant of the bamboo scrimber,they were dynamically tested by the free plate transient excitation method and cantilever plate torsional vibration method.The static four-point bending method was used to verify the accuracy and reliability of the dynamic elastic modulus,shear modulus,and Poisson’s ratio of the bamboo scrimber.The mechanism analysis and evaluation of the quality grade,homogeneity,and size effect of the bamboo scrimber whole board were carried out.The main results show that the dynamic elastic modulus,shear modulus,and Poisson’s ratio of the bamboo scrimber are 12 GPa,1500 MPa,and 0.31,respectively,which meet the requirements of GB/T 40247-2021 for structural bamboo scrimber. 展开更多
关键词 Bamboo scrimber elastic constant dynamic test static verification free plate transient excitation
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Improved dynamic testing by impedance control 认领 引用
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作者 Jochen Carl Mettupalayam V. Sivaselvan 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2011年第3期423-435,共13页
In this paper, the issue of actuator-structure interaction in dynamic testing of structures is considered. The problem is approached from the novel standpoint of impedance control. It is shown that an effective strate... In this paper, the issue of actuator-structure interaction in dynamic testing of structures is considered. The problem is approached from the novel standpoint of impedance control. It is shown that an effective strategy to design controls for dynamic testing is by designing the test system impedance. It is also shown that this can be achieved using feedforward compensation. The analysis is carried out in the context of displacement controlled dynamic testing, when the tested structure has a high and nonlinear stiffness. It is demonstrated that stable and accurate dynamic testing can be achieved using the proposed strategy, when this is not possible using traditional feedback control techniques. Furthermore, the impedance control and feedforward strategies are applied in the context of hybrid simulation, a technique of coupling computational and physical substructures applied in earthquake engineering. Here, a delay compensation scheme is necessary in addition to feedforward. Experimental results are presented that demonstrate both improved dynamic testing performance when impedance control is employed, and its applicability in hybrid simulation. 展开更多
关键词 dynamic test actuator-structure interaction impedance control hybrid simulation feedforward strategy
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Fatigue damage characteristics of moraine soil subjected to dynamic loading via the energy dissipation method 认领 引用
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作者 LIU Meng-xin WANG Xiao-yu +2 位作者 ZHU Long-kang SONG Dan-qing LIU Xiao-li 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第5期2302-2325,共24页
The evolution mechanism of the dynamic response and failure mode of moraines under dynamic loading is unclear because of the special structure of mixed coarse and fine particles and sharp edges.This work established a... The evolution mechanism of the dynamic response and failure mode of moraines under dynamic loading is unclear because of the special structure of mixed coarse and fine particles and sharp edges.This work established a novel fatigue parameter(a)and a fatigue damage model for moraine on the basis of its strain development mechanism and energy dissipation observed through cyclic loading experiments.The strain mode,dynamic strength characteristics and fatigue damage development process of the moraine were investigated.The fatigue parameters reflected the speed of fatigue damage,and the fatigue damage model describes the development process and characteristics of fatigue damage.The results reveal that the moraine exhibits a strain hardening mode and fatigue damage under low cyclic loading,and the fatigue life is related to the particle size and water content.The dynamic strength is positively correlated with the coarse particle size and negatively correlated with the water content.Furthermore,the fatigue parameters are positively correlated with the dynamic stress and negatively correlated with the particle size.The fatigue parameters converge when the water content is 8%.The fatigue parameters are influenced by the particle size,water content and stress.Under different dynamic stresses,water contents and particle sizes,the moraine exhibited three fatigue damage development modes,including convex,linear and concave fatigue damage.Moreover,the development of convex damage is rapid in the early stage,and concave damage is rapid in the late stage.At a low fatigue parameter(a1.86).This work can provide a reference for disaster assessment and prevention of moraine slopes in complex environments. 展开更多
关键词 moraine dynamic triaxial test fatigue damage characteristics fatigue parameters fatigue damage model
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Energy absorption mechanism and design method of anchor cable under dynamic-static coupling condition 认领 引用
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作者 Qi Wang Jingxuan Liu +4 位作者 Mingzi Wang Bei Jiang Rugang Duan Shuo Xu Xuepeng Wang 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第5期941-956,共16页
To effectively control the large deformation of the surrounding rock under complex conditions,it is often necessary to apply prestress to anchor cables.However,due to the influence of surrounding rock deformation,mini... To effectively control the large deformation of the surrounding rock under complex conditions,it is often necessary to apply prestress to anchor cables.However,due to the influence of surrounding rock deformation,mining disturbance,and strong impact,anchor cables are often in a dynamic and static coupling stress state.Therefore,it is crucial to study the dynamic and static coupling mechanical characteristics of anchor cables.Based on this,the self-developed dynamic and static coupling test equipment is developed.The dynamic and static coupling mechanical test of anchor cables is conducted.Test results indicate that the energy absorption for anchor cables under the initial load of 350 kN decreased by 69.8%compared to the condition without initial load,and the energy absorption efficiency increased by 6.6 times.The increase of initial load can improve its energy absorption efficiency,but it can also lead to a decrease in its energy absorption.The energy absorption and energy absorption efficiency shows a bilinear variation law with the increase of initial load.On this basis,the energy absorption calculation formula and the support design model of the anchor cable are established.It provides new ideas for the safety control of dynamic disasters in deep engineering. 展开更多
关键词 Anchor cable support Working load Dynamic and static coupling test Energy absorption characteristics Design method
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Dynamic deformation characteristics of EPS particles lightweight soil based on Ramberg-Osgood model 认领 引用
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作者 Hou Tianshun Cui Yixiang Fu Shaojun 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2026年第3期683-693,共11页
To explore the dynamic deformation characteristics of expanded polystyrene(EPS)particle lightweight soil under dynamic loads,based on the Ramberg-Osgood(R-O)model with variable parameters,we extracted the parameters t... To explore the dynamic deformation characteristics of expanded polystyrene(EPS)particle lightweight soil under dynamic loads,based on the Ramberg-Osgood(R-O)model with variable parameters,we extracted the parameters through dynamic triaxial test results for lightweight soil.Thus,the variation laws and applicable ranges of the model parameters R andα1 with the dynamic shear strain(γd)of the lightweight soil were obtained.The influences of the EPS particle content,cement mixing ratio,and confining pressure on the model parameters were analyzed.The applicability of the R-O model to lightweight soil was verified by changing the stress state and stress path in the dynamic triaxial tests.The results reveal that the range of R applicable to lightweight soil under dynamic loads is(1,+∞)and thatα1 should be considered within the range of effectiveγd.Whenγd is less than 1×10-3,R of the R-O model with variable parameters for lightweight soil decreases rapidly and subsequently tends to remain stable with an increase inγd;the stable value range of R is(1,2).Further,whenγd is less than 1×10-3,α1 decreases rapidly and then increases withγd.The damping effect of lightweight soil exhibits two types of curve forms:bell-shaped and S-shaped curves.Notably,the variable parameters of the R-O model can be adjusted with the changes inγd.Thus,this model can adequately describe the variation laws of the dynamic shear modulus ratio and the damping ratio for lightweight soils subjected to complex dynamic loads. 展开更多
关键词 lightweight soil dynamic shear modulus ratio damping ratio Ramberg-Osgood model dynamic triaxial test
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Spatial dynamic response of aeolian sand subgrade reinforced by geocell 认领 引用
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作者 LIU Jie LIU Qinli +3 位作者 LIU Xuejun LI Kaiqiang HU Changtao AI Yuhao 《水利水电技术（中英文）》 CSCD 北大核心 2026年第4期187-201,共15页
[Objective]The spatial dynamic response of a new desert highway subgrade structure by geocell reinforcement with aeolian sand is studied.[Methods]Based on the dynamic triaxial test,a field test via monitoring the resp... [Objective]The spatial dynamic response of a new desert highway subgrade structure by geocell reinforcement with aeolian sand is studied.[Methods]Based on the dynamic triaxial test,a field test via monitoring the response acceleration change is carried out.The attenuation law and dynamic response range of the response acceleration along the depth and horizontal directions of the subgrade are obtained for the geocell-reinforced subgrade structure.The mechanism of dynamic response of geocell-reinforced materials to aeolian sand subgrade is further discussed.[Results]The result show that both vehicle load and vehicle speed have a great influence on the response acceleration of the new aeolian sand subgrade.The response acceleration shows a nonlinear attenuation in the depth direction,and the attenuation rate gradually slows down with increasing depth.Meantime,the horizontal direction shows a variation of exponential decay.Therefore,an attenuation prediction model of response acceleration along the horizontal direction of aeolian sand subgrade is established.[Conclusion]Based on this field test condition,the most dominant dynamic response region of the subgrade is in a range of 1.2 m in depth and 2.5 m in horizontal.The reinforcement effect of geocell on aeolian sand increases the confining pressure level,and restricts the lateral displacement of soil.In addition,the generation of shear bands in the soil is inhibited by the reinforcement effect.This makes the energy dissipation of the subgrade soil more obvious. 展开更多
关键词 subgrade engineering geocell aeolian sand large-scale triaxial test spatial dynamic response dynamic triaxial test field test influencing factors
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Simulation of large-scale numerical substructure in real-time dynamic hybrid testing 认领 引用 被引量：10
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作者 Zhu Fei Wang Jinting +2 位作者 Jin Feng Zhou Mengxia Gui Yao 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2014年第4期599-609,共11页
A solution scheme is proposed in this paper for an existing RTDHT system to simulate large-scale finite element （FE） numerical substructures. The analysis of the FE numerical substructure is split into response anal... A solution scheme is proposed in this paper for an existing RTDHT system to simulate large-scale finite element （FE） numerical substructures. The analysis of the FE numerical substructure is split into response analysis and signal generation tasks, and executed in two different target computers in real-time. One target computer implements the response analysis task, wherein a large time-step is used to solve the FE substructure, and another target computer implements the signal generation task, wherein an interpolation program is used to generate control signals in a small time-step to meet the input demand of the controller. By using this strategy, the scale of the FE numerical substructure simulation may be increased significantly. The proposed scheme is initially verified by two FE numerical substructure models with 98 and 1240 degrees of freedom （DOFs）. Thereafter, RTDHTs of a single frame-foundation structure are implemented where the foundation, considered as the numerical substructure, is simulated by the FE model with 1240 DOFs. Good agreements between the results of the RTDHT and those from the FE analysis in ABAQUS are obtained. 展开更多
关键词 real-time dynamic hybrid testing large-scale numerical substructure control signal generation finite element simulation
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Delay-dependent stability and added damping of SDOF real-time dynamic hybrid testing 认领 引用 被引量：14
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作者 Chi Fudong Wang Jinting Jin Feng 《Earthquake Engineering and Engineering Vibration》 SCIE EI 2010年第3期425-438,共14页
It is well-recognized that a transfer system response delay that reduces the test stability inevitably exists in real-time dynamic hybrid testing(RTDHT).This paper focuses on the delay-dependent stability and added da... It is well-recognized that a transfer system response delay that reduces the test stability inevitably exists in real-time dynamic hybrid testing(RTDHT).This paper focuses on the delay-dependent stability and added damping of SDOF systems in RTDHT.The exponential delay term is transferred into a rational fraction by the Pad6 approximation,and the delay-dependent stability conditions and instability mechanism of SDOF RTDHT systems are investigated by the root locus technique.First,the stability conditions are discussed separately for the cases of stiffness,mass,and damping experimental substructure.The use of root locus plots shows that the added damping effect and instability mechanism for mass are different from those for stiffness.For the stiffness experimental substructure case,the instability results from the inherent mode because of an obvious negative damping effect of the delay.For the mass case,the delay introduces an equivalent positive damping into the inherent mode,and instability occurs at an added high frequency mode.Then,the compound stability condition is investigated for a general case and the results show that the mass ratio may have both upper and lower limits to remain stable.Finally,a high-emulational virtual shaking table model is built to validate the stability conclusions. 展开更多
关键词 real-time dynamic hybrid testing root locus analysis delay-dependent stability Pade approximation added damping
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Dynamic mechanical properties and constitutive model of red sandstone under different loading rates and high temperatures 认领 引用 被引量：3
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作者 LI Ye YANG Sheng-qi +2 位作者 LIU Zi-lu WANG Chao LI Zi-li 《Journal of Central South University》 SCIE EI CAS CSCD 2025年第5期1922-1937,共16页
Dynamic compression experiments were conducted on red sandstone utilizing a split Hopkinson pressure bar(SHPB)to study the loading rate and high temperatures on their mechanically deformed properties and ultimate fail... Dynamic compression experiments were conducted on red sandstone utilizing a split Hopkinson pressure bar(SHPB)to study the loading rate and high temperatures on their mechanically deformed properties and ultimate failure modes,and to analyze the correlation between the strain rate,temperature,peak strength,and ultimate failure modes.The results show that the mass decreases with the increase of treatment temperature,and the pattern of the stress−strain curves is not impacted by the increase of impact velocity.Under a fixed temperature,the higher the impact velocity,the higher the strain rate and dynamical compression strength,indicating a strain rate hardening effect for red sandstone.With an increasing treatment temperature,the strain rate gradually increases when the impact loading remains unchanged,suggesting a rise in the deformability of red sandstone under high-temperature environment.Raise in both impact velocity and treatment temperature leads to an intensification of the damage features of the red sandstone.Similarly,higher strain rates lead to the intensification of the final damage mode of red sandstone regardless of the change in treatment temperature.Moreover,a dynamic damage constitutive model that considers the impacts of strain rate and temperature is proposed based on experimental results. 展开更多
关键词 high temperature strain rate SHPB dynamic tests dynamic damage constitutive
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Stability and accuracy of central difference method for real-time dynamic substructure testing considering mass participation coefficient 认领 引用
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作者 Zheng Lichang Xu Guoshan +3 位作者 Yang Ge Wang Zhen Yang Kaibo Zheng Zhenyun 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2024年第3期625-636,共12页
For real-time dynamic substructure testing(RTDST),the influence of the inertia force of fluid specimens on the stability and accuracy of the integration algorithms has never been investigated.Therefore,this study prop... For real-time dynamic substructure testing(RTDST),the influence of the inertia force of fluid specimens on the stability and accuracy of the integration algorithms has never been investigated.Therefore,this study proposes to investigate the stability and accuracy of the central difference method(CDM)for RTDST considering the specimen mass participation coefficient.First,the theory of the CDM for RTDST is presented.Next,the stability and accuracy of the CDM for RTDST considering the specimen mass participation coefficient are investigated.Finally,numerical simulations and experimental tests are conducted for verifying the effectiveness of the method.The study indicates that the stability of the algorithm is affected by the mass participation coefficient of the specimen,and the stability limit first increases and then decreases as the mass participation coefficient increases.In most cases,the mass participation coefficient will increase the stability limit of the algorithm,but in specific circumstances,the algorithm may lose its stability.The stability and accuracy of the CDM considering the mass participation coefficient are verified by numerical simulations and experimental tests on a three-story frame structure with a tuned liquid damper. 展开更多
关键词 real-time dynamic substructure testing central difference method stability mass participation coefficient tuned liquid damper
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Method of Testing of Dynamic Forces on Digital Jet Elements 认领 引用 被引量：6
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作者 莫波 杨彩霞 《Journal of Beijing Institute of Technology》 EI CAS 2002年第4期393-396,共4页
Method of testing for dynamic output forces from jet elements is studied, the handwidth is large in testing with this method. By establishing a model of the test system and simulating it, principles of how inherent fe... Method of testing for dynamic output forces from jet elements is studied, the handwidth is large in testing with this method. By establishing a model of the test system and simulating it, principles of how inherent features of the test system affect the dynamic force test are found out. Thus a theoretical foundation is given for the design and error modification to the actual test system. 展开更多
关键词 digital jet element dynamic force test modeling error analysis
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Mechanistic Analysis of Porous Iron Scaffold Degradation in Cancellous Bone Structure Subjected to Dynamic Simulated Body Fluid 认领 引用
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作者 Muhammad Azfar Noordin Abdul Hakim Md Yusop +1 位作者 Ardiyansyah Syahrom Amir Putra Md Saad 《Journal of Bionic Engineering》 SCIE EI CSCD 2025年第1期306-321,共16页
This work examines the impact of incorporating the physiological conditions of human cancellous bone,by integrating similar porosity of porous Fe with the cancellous bone under dynamic immersion test.All of the porous... This work examines the impact of incorporating the physiological conditions of human cancellous bone,by integrating similar porosity of porous Fe with the cancellous bone under dynamic immersion test.All of the porous Fe specimens with~80%porosity were immersed in Simulated Body Fluid(SBF)with a flow rate of 0.3 ml/min integrated with cancellous bone for 7,14 and 28 days.Porous Fe with the lowest surface area has the highest degradation rate despite having the lowest relative weight loss.The relationship between fluid induced shear stress and weight loss of specimens have been established. 展开更多
关键词 Dynamic immersion test Cancellous bone Physiological activities Degradation rate Porous Fe
Dynamic Mechanical Behavior and Failure Characteristics of Sandstone Subjected to Freeze-thaw Treatment at Different Strain Rates 认领 引用
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作者 ZHANG Chunyang TAN Tao +1 位作者 LI Xiaoshuang ZHANG Yuchao 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2025年第5期1262-1274,共13页
The influence of FT(freeze-thaw)cycles and average strain rate on the dynamic impact performance,energy evolution characteristics,and failure behavior of sandstone was studied through dynamic impact tests.Results disp... The influence of FT(freeze-thaw)cycles and average strain rate on the dynamic impact performance,energy evolution characteristics,and failure behavior of sandstone was studied through dynamic impact tests.Results displayed that the FT damage process of samples can be divided into three stages based on the changes in weight,porosity,and P-wave velocity.The dynamic peak strength,dynamic elastic modulus,and strength ratio decreased with increasing FT cycles,and increased with increasing average strain rate.Moreover,the average strain rate reduced the influence of FT cycles on dynamic peak strength.In general,the incident energy,reflected energy and dissipated energy increased with increasing average strain rate,the transmitted energy was negligibly affected by the average strain rate,and the energy dissipation ratio decreased with increasing average strain rate.In addition,the influence of FT cycles on each type of energy and energy dissipation ratio during sample failure was smaller than that of average strain rate.The average size of fragments can accurately demonstrate the impact of FT damage and average strain rate on dynamic peak strength and failure mode,and quantitatively evaluate the sample’s fragmentation degree.Fractal dimension varies with FT cycles and average strain rate,and the threshold is between 148.30 and 242.57 s-1.If the average strain rate is in the threshold range,the relationship between the fractal dimension and dynamic peak strength is more regular,otherwise,it will become complicated.The results reveal the dynamic failure mechanism of white sandstone samples,providing assistance for dynamic rock-breaking and disaster prevention in cold regions. 展开更多
关键词 white sandstone FT cycles dynamic impact tests dynamic mechanical characteristics energy conversion fractal dimension of fragments
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Mechanical properties of rock under coupled static-dynamic loads 认领 引用 被引量：17
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作者 Xibing Li Zilong Zhou +4 位作者 Fujun Zhao Yujun Zuo Chunde Ma Zhouyuan Ye Liang Hong 《Journal of Rock Mechanics and Geotechnical Engineering》 2009年第1期41-47,共7页
Rock drilling machine,INSTRON testing system,and SHPB device are updated to investigate the characteristics of rocks at great depth,with high loads from overburden,tectonic stresses and dynamic impacts due to blasting... Rock drilling machine,INSTRON testing system,and SHPB device are updated to investigate the characteristics of rocks at great depth,with high loads from overburden,tectonic stresses and dynamic impacts due to blasting and boring.It is verified that these testing systems can be used to study the mechanical properties of rock material under coupled static and dynamic loading condition and give useful guidance for the deep mining and underground cavern excavation.Various tests to determine the rock strength,fragmentation behavior,and energy absorption were conducted using the updated testing systems.It is shown that under coupled static-dynamic loads,if the axial prestress is lower than its elastic limit,the rock strength is higher than the individual static or dynamic strength.At the same axial prestress,rock strength under coupled loads rises with the increasing strain rates.Under coupled static and dynamic loads,rock is observed to fail with tensile mode.While shear failure may exist if axial prestress is high enough.In addition,it is shown that the percentage of small particles increases with the increasing axial prestress and impact load based on the analysis of the particle-size distribution of fragments.It is also suggested that the energy absorption ratio of a specimen varies with coupled loads,and the maximum energy absorption ratio for a rock can be obtained with an appropriate combination of static and dynamic loads. 展开更多
关键词 rock dynamic testing system coupled static-dynamic loads strength fragmentation energy absorption
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Exploring the coherence function across the soft soil depth in seismic ground motion,based on a multi-dimensional autoregressive model 认领 引用
20
作者 Lan Jingyan Liu Xiangyu +3 位作者 Liu Juan K.C.Diwakar Jeevan Rawal Hu Liangbo 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2026年第2期301-313,共13页
The present study designs a dynamic centrifugal model test to simulate water-free and water-covered free-field sites with the objective of identifying the main characteristics of seismic motion at sea and evaluating h... The present study designs a dynamic centrifugal model test to simulate water-free and water-covered free-field sites with the objective of identifying the main characteristics of seismic motion at sea and evaluating how overlying seawater affects the spatial coherence between any two points during an earthquake.The acceleration time history at various subsurface depths was recorded in response to El Centro seismic waves that were used as input.The coherence function between each point is obtained using a multi-dimensional autoregressive(AR)model.The results show that coherence generally increases with the input acceleration magnitude.The coherence function exhibits a general diminishing tendency with increasing distance.The effect of overlying water weight and the interaction between the water and the soil play an important role in ground motion response.Overall,coherence in the water-covered site is found to be lower than in the water-free site under the same working condition. 展开更多
关键词 spatial coherency coefficient autoregressive model overlying seawater dynamic centrifugal model test offshore soft soil sites
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