高应变率下的率相关损伤演化及其对材料动态行为的影响(英文)  

Rate-dependent Damage Evolution and its Influence on Dynamic Behavior of Materials at High Strain Rates

作　　者：王礼立[1] 周风华[1] 孙紫建[1] 黄德进[1] WANG Li-li;ZHOU Feng-hua;SUN Zi-jian;HUANG De-jin(Mechanics and Materials Science Research Center,Ningbo University,Ningbo 315211,China)

机构地区：[1]宁波大学力学和材料科学研究中心,浙江宁波315211

出　　处：《宁波大学学报（理工版）》2012年第1期27-34,共8页Journal of Ningbo University：Natural Science and Engineering Edition

基　　金：Supported by the National Natural Science Foundation of China(11032001);Russian Foundation for Basic Research(11-01-91217);K.C.Wong Magna Fund in Ningbo University

摘　　要：实验和数模结果都揭示动态损伤演化同时依赖于应变和应变率.基于热激活机理提出了一个新的损伤演化率和一个新的断裂准则.为确定材料的损伤参数,发展了两种途径:DM-ZWT途径和BP神经网络途径.两种途径的理论预示都与实验数据很好地相一致.Both experimental and numerical results reveal that dynamic damage evolution depends on both strain and strain rate. Based on the thermal activated mechanism, a new damage evolution law and a new fracture criterion are proposed. For determining the damage parameters of material, two approaches are developed： the DM-ZWT approach and the SHPB＋BP neural network approach. The predictions by both approaches are in good agreement with the experimental data.

关 键 词：损伤演化 材料动态行为 高应变率 绝热剪切 

分 类 号：O346.5[理学—固体力学]