Further numerical investigation on concrete dynamic behaviors with considering stress non-equilibrium in SHPB test based on the waveform features

作     者：T.H.Lv X.W.Chen Y.J.Deng G.Chen T.H.Lv;X.W.Chen;Y.J.Deng;G.Chen

作者机构：State Key Laboratory of Explosion Science and TechnologyBeijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary ScienceBeijing Institute of TechnologyBeijing 100081China Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan ProvinceSouthwest University of Science and TechnologyMianyang 621000China Institute of Systems EngineeringChina Academy of Engineering PhysicsMianyang 621999China 

出 版 物：《Acta Mechanica Sinica》 (力学学报（英文版）)

年 卷 期：2020年第36卷第4期

页      面：873-886页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：supported by the National Natural Science Foundations of China(Grants 11390361 11627901 and 11872118) 

主　　题：Concrete material Split Hopkinson pressure bar test Numerical investigation Waveform feature Stress non-equilibrium Damage failure volume 

摘      要：In this study,with the meso-scale model reliably validated in our previous work(Construction and Building Materials,2018),the waveform features of plain concrete under various loading conditions and especially with considering stress non-equilibrium are reliably reproduced and *** with waveform features,the violation indicator of the specimen stress equilibrium in the split Hopkinson pressure bar test is identified for concrete-like damage softening *** concrete material behaviors for stress non-equilibrium are further analyzed,*** dynamic increase factor(DIF)and damage development,*** conception of“damage failure volumeis introduced,and a new method of defining the development of concrete dynamic damage is given in the nimierical ***’s more,the“compression waveand“double peakphenomena observed in the experiment are further interpreted based on the means of numerical *** features how to reflect the concrete material properties is also *** results show that,the disappearance of the“double peak phenomenon of reflection curve under high strain rate can be regarded as the indicator of the violation of stress *** the violation of the stress equilibrium,the relevant DIFs of the concrete specimen will not change ***,the concrete specimen will turn into structural response from material *** conception of“damage failure volumecan well explain the generation of the“double peakphenomenon of the reflection *** “compression wave phenomenon of reflection curve under lower strain rates is derived from the unloading expansion recovery of the concrete ***,under the same loading condition,the amplitude of the first peak of the reflection curve can be used as the evaluation standard of the bonding quality between mortar and aggregates.