应用数学和力学2025，Vol.46Issue(9)：1083-1107,25.DOI:10.21656/1000-0887.450176
聚脲弹性体动态力学行为:实验表征、微观机制及本构建模
Dynamic Behaviors of Polyurea Elastomer:Experimental Characterization,Microscopic Mechanisms and Constitutive Modeling
摘要
Abstract
The application of polyurea elastomer to impact protection has broad prospects.However,the physi-cal mechanisms of dynamic deformation and failure of the polyurea under high-pressure impact,delamination,and other conditions are still unclear.Besides,effective constitutive and damage models to describe the dynam-ic behaviors of polyurea under various strain rates and stress states are still scarce.In response to these chal-lenging issues,the dynamic behaviors of polyurea elastomers under different strain rates,impact pressures,and stress states were systematically studied through experimental characterization,molecular dynamics simu-lation,and macroscopic mechanical modeling.Full atomic and 2 coarse-grained models for polyurea were es-tablished,its microstructure evolution was analyzed,and the microscopic physical mechanisms of deformation and failure of polyurea under high-strain-rate tension,high-pressure impact and high stress triaxiality loading,were revealed.A constitutive model for polyurea elastomers was established in view of the coupling effects of strain rates,temperature and pressure under strong impact.A macroscopic damage model uniformly describing multiple deformation modes was built,including void nucleation criteria and void flow rules.Through verifica-tion,the established macroscopic mechanical models can accurately describe the dynamic behaviors of polyurea under impact loading.This work provides a guidance for the optimization design and impact protection applica-tion of polyurea elastomers in the future.关键词
聚脲弹性体/动态力学行为/孔洞损伤/本构模型/分子动力学Key words
polyurea elastomer/dynamic behavior/void damage/constitutive model/molecular dynamics分类
数理科学引用本文复制引用
初东阳,姚凯丽,庄茁,柳占立..聚脲弹性体动态力学行为:实验表征、微观机制及本构建模[J].应用数学和力学,2025,46(9):1083-1107,25.基金项目
国家自然科学基金(11972210) （11972210）
国家重点研发计划项目(2022YFC3320502) （2022YFC3320502）
