纯铜杆件局部受控的动态拉伸试验(英文)  

An Interrupted Dynamic Tensile Testing for Pure Copper Bars

作　　者：马东方[1] 陈大年[1] 吴善幸[1] 王焕然[1] 蔡灿元[1] MA Dong-fang;CHEN Da-nian;WU Shan-xing;WANG Huan-ran;CAI Can-yuan(Mechanics and Materials Science Research Center,Ningbo University,Ningbo 315211,China))

机构地区：[1]宁波大学力学与材料科学研究中心,浙江宁波315211

出　　处：《宁波大学学报（理工版）》2012年第1期83-88,共6页Journal of Ningbo University：Natural Science and Engineering Edition

基　　金：Supported by the National Natural Science Foundation of China(11032001,10872100,11072118);Russian Foundation for Basic Research(11-01-91217)

摘　　要：在所发明的一种基于一级气体炮的高速冲击拉伸试验装置(HSTF)上,于多根纯铜杆件上安装特制夹具,控制试件不同的局部延伸,得到试件不同阶段的实验结果,取得冲击拉伸杆颈缩与断裂"凝固化"了的过程信息,揭示了纯铜试件在冲击拉伸下动态断裂过程的不同阶段.对于回收的纯铜试件,进行了扫描电镜分析.将Ragab提出的在轴对称颈缩区域中心放置特征空穴的简化模型从准静态推广到动态,旨在预测纯铜杆件在冲击拉伸下的局部化颈缩与断裂.A high-speed tensile facility （HSTF） invented by us was applied to interrupt tests for pure copper bars controlled locally at different levels of elongation. It was realized to isolate and identify the various stages of the dynamic fracture process of pure copper bars under impact tension. The results of scanning electron microscopical （SEM） investigation of recovered pure copper specimens were shown. The axisymmetric necking rod model with a central void under static tension presented by Ragab was extended to predicting localized necking and fracture of pure copper bars under impact tension.

关 键 词：局部受控试验 高应变率 本构方程 颈缩 空穴演化 纯铜杆件 

分 类 号：O347.3[理学—固体力学]