典型文献
A Macro-Mechanical Study for Capturing the Dynamic Behaviors of a Rate-Dependent Elastomer and Clarifying the Energy Dissipation Mechanisms at Various Strain Rates
文献摘要：
A strain-rate-sensitive polyurethane elastomer is numerically investigated to reveal improved impact characteristics and analyze the concerned rate dependencies and dynamic energy dissipation features.A physical constitutive model in view of amorphous molecular struc-ture of the elastomer is proposed by relating the macro-mechanical behaviors to micro-structural changes through molecular transitions and flow activations.Two distinct relaxation processes are considered because of entangled molecular networks,with each possessing a unique activa-tion energy.Through calibration with experimental data,finite element simulations based on the model are conducted.Related to the loading rate,the structural entropy of molecular chain entanglements,rate-dependent yielding,plateau flow and densification are well predicted by the model.The investigations are extended further regarding the material recoverability and accord-ingly,strain energy absorptions are illustrated.A power law function is proposed for designing the energy absorption relation to the applied loading rate.Finally,the inherent mechanisms caus-ing the dynamic energy absorptions are analyzed with notable clarifications of post-experimental observations obtained via scanning electron microscopy.
文献关键词：
中图分类号：
作者姓名：
Shahzad Fateh Ali;Jitang Fan;Jianqing Feng;Xiangquan Wei
作者机构：
State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China;Aerospace System Engineering shanghai,Shanghai 201109,China
文献出处：
引用格式：
[1]Shahzad Fateh Ali;Jitang Fan;Jianqing Feng;Xiangquan Wei-.A Macro-Mechanical Study for Capturing the Dynamic Behaviors of a Rate-Dependent Elastomer and Clarifying the Energy Dissipation Mechanisms at Various Strain Rates)[J].固体力学学报（英文版）,2022(02):228-238
A类：
absorptions,caus,clarifications
B类：
Macro,Mechanical,Study,Capturing,Dynamic,Behaviors,Dependent,Elastomer,Clarifying,Energy,Dissipation,Mechanisms,Various,Strain,Rates,strain,sensitive,polyurethane,elastomer,numerically,investigated,reveal,improved,impact,characteristics,concerned,dependencies,dynamic,energy,dissipation,features,physical,constitutive,model,view,amorphous,molecular,proposed,by,relating,macro,mechanical,behaviors,structural,changes,through,transitions,flow,activations,Two,distinct,relaxation,processes,are,considered,because,entangled,networks,each,possessing,unique,Through,calibration,experimental,data,finite,element,simulations,conducted,Related,loading,entropy,chain,entanglements,dependent,yielding,plateau,densification,well,predicted,investigations,extended,further,regarding,material,recoverability,accord,ingly,illustrated,power,law,function,designing,relation,applied,Finally,inherent,mechanisms,analyzed,notable,post,observations,obtained,via,scanning,electron,microscopy
AB值：
0.653539
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