A Macro-Mechanical Study for Capturing the Dynamic Behaviors of a Rate-Dependent Elastomer and Clarifying the Energy Dissipation Mechanisms at Various St rain Rates
作者机构：State Key Laboratory of Explosion Science and TechnologyBeijing Institute of TechnologyBeijing 100081China Aerospace System Engineering shanghaiShanghai 201109China
出 版 物：《Acta Mechanica Solida Sinica》 (固体力学学报（英文版）)
年 卷 期：2022年第35卷第2期
页 面：228-238页
核心收录：
学科分类：08[工学] 080102[工学-固体力学] 0801[工学-力学（可授工学、理学学位）]
基 金：The authors acknowledge the financial support from the Independent Research Project of State Key Laboratory of Explosion Science and Technology with Grant No.QNKT20-02 the National Natural Science Foundation of China with Grant No.11602024
主 题：Elastomer Constitutive model Energy absorption Ratedependent Scanning electron microscopy
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 *** distinct relaxation processes are considered because of entangled molecular net works,with each possessing a unique activation *** calibration with experimental data,finite element simulations based on the model are *** to the loading rate,the structural entropy of molecular chain entanglements,rate-dependent yielding,plateau flow and densification are well predicted by the *** investigations are extended further regarding the material recoverability and accordingly,strain energy absorptions are illustrated.A power law function is proposed for designing the energy absorption relation to the applied loading ***,the inherent mechanisms causing the dynamic energy absorptions are analyzed with notable clarifications of post-experimental observations obtained via scanning elec Iron microscopy.
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