冲击加载参数对纯铝中微孔洞长大动力学行为的影响  

On the Influence of Shock Loading Parameters upon the Dynamic Behavior of Void Growth in Pure Aluminum

作　　者：王春雷[1] 王永刚[1] 

机构地区：[1]宁波大学力学与材料研究中心,浙江宁波315211

出　　处：《宁波大学学报（理工版）》2011年第2期94-97,共4页Journal of Ningbo University：Natural Science and Engineering Edition

基　　金：国家自然科学基金NSAF项目(10876014)

摘　　要：采用LS-DYNA瞬态动力学有限元程序研究了冲击加载参数对纯铝中微孔洞长大的动力学行为的影响,结果显示:(1)在孔洞周围塑性应变场的驱动下,微孔洞呈现球形快速长大,长大速率与冲击加载应力的峰值相关;(2)无论是改变飞片厚度,还是样品分层技术,微孔洞半径的增长量随着加载持续时间而增大;(3)微孔洞半径相对增长量随着载荷冲量呈线性变化关系,在载荷冲量恒定条件下,冲击加载应力强度与持续时间之间可以相互进行"等效".Using LS-DYNA software as a tool for nonlinear dynamic finite element analysis,the effect of shock loading parameters on the growth of void in aluminum under plate impact loading is investigated.Results can be described as follows： Firstly,the velocity of the growth of void radius increases with the increasing of shock stress peak amplitude;Secondly,the maximum amplitude of void radius increases with the increasing of loading pulse duration;Finally,the relative value of the growth of void radius changes linearly with the shock loading impulse under the varying shock loading pulse shapes,which indicates that there is a synergy between the peak amplitude and duration.

关 键 词：固体力学 微孔洞长大 冲击加载参数 纯铝 

分 类 号：TU473[建筑科学—结构工程]