考虑宽应变率的修正Johnson-Cook模型及蜂窝板动态力学响应模拟  

A modified Johnson-Cook model for wide-range strain rate and dynamic mechanical response simulation of honeycomb panel

作　　者：李双蓓[1,2,3] 赵璇 吴园 常岩军[1,2,3] Li Shuangbei;Zhao Xuan;Wu Yuan;Chang Yanjun(College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, China;Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Guangxi University, Nanning 530004, China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西大学工程防灾与结构安全教育部重点实验室,广西南宁530004 [3]广西大学广西防灾减灾与工程安全重点实验室,广西南宁530004

出　　处：《武汉科技大学学报》2021年第5期394-400,共7页Journal of Wuhan University of Science and Technology

基　　金：国家自然科学基金资助项目(51878186,11962001);广西科技重大专项(桂科AA18118029).

摘　　要：本文以Ludwik准则和Voce准则线性叠加的模型为应变硬化项、Cowper-Symonds模型为应变率项对Johnson-Cook模型进行修正,提出了一种能够反映宽应变率条件下金属材料力学行为的H/V-CS本构模型并对该模型的正确性进行了验证。此外,还基于H/V-CS模型结合有限元分析,研究了蒙皮厚度、芯层壁厚和芯层高度对蜂窝板吸能效果的影响。结果表明,本文所建H/V-CS模型可以准确地模拟金属材料在宽应变率条件下的动态力学响应;蜂窝板吸能速率随着蒙皮厚度、芯层厚度及高度的增加而增大,吸能稳定值则随着蒙皮厚度及芯层厚度的增加而减小并随芯层高度的增加而增大。The Johnson-Cook model was modified by taking the linear superposition model of the Ludwik criterion and the Voce criterion as the strain hardening term,the Cowper-Symonds model as the strain rate term.A H/V-CS constitutive model that can reflect the mechanical behavior of metal materials under wide-range strain rate conditions was proposed,and the validity of the model was verified.In addition,the influences of skin thickness,core layer thickness and height on the energy absorption effect of the honeycomb panel were studied via the H/V-CS model and finite element analysis.The results show that the dynamic mechanical response of metal materials under wide-range strain rate conditions can be accurately simulated by the proposed H/V-CS model.The energy absorption rate of the honeycomb panel increases with the increase of skin thickness,core layer thickness and height,while the stability value of energy absorption decreases with the increase of skin thickness and core layer thickness,and increases with the increase of core layer height.

关 键 词：金属蜂窝板 宽应变率 应变硬化 修正Johnson-Cook模型 VUMAT子程序 动态力学响应 吸能性能 

分 类 号：O344[理学—固体力学]