高导无氧铜圆柱-平板冲击实验及不同本构模型效果比较  

A cylinder-plate impact test for oxygen-free high-conductivity copper and comparison of effects of three constitutive models

作　　者：吴善幸[1] 陈大年[1,2] 胡金伟[2] 张铎[1] 金扬辉[2] 王焕然[2] 

机构地区：[1]西北工业大学航天学院,陕西西安710072 [2]宁波大学力学与材料科学研究中心,浙江宁波315211

出　　处：《爆炸与冲击》2009年第3期295-299,共5页Explosion and Shock Waves

基　　金：国家自然科学基金项目(10672082)

摘　　要：利用一级气炮对高导无氧铜(OFHC)进行了圆柱以205 m/s速度冲击平板实验,并进行了数值模拟。用锰铜应力计测试了靶中应力随时间的变化,并进行了回收观测。采用Johnson-Cook(J-C)、Zerilli-Arm-strong(Z-A)、Steinberg-Cochran-Guinan(S-C-G)3种本构模型对实验进行了数值模拟。实验结果与数值模拟结果比较表明:就峰值应力而言,采用J-C、Z-A及S-C-G本构模型的计算结果都比较接近实验;就圆柱变形而言,Z-A及S-C-G模型的计算较J-C模型结果更符合实验。然而,速度为500 m/s冲击实验的数值模拟结果表明:3种本构模型的计算结果差异明显。An oxygen-free high-conductivity copper（OFHC） cylinder was driven by a single-stage gun to impact OFHC plates at the velocity of 205 m/s. The longitudinal stress-time traces in the plates were recorded by the manganin stress gauge and the recovered samples were observed. And the longitudinal stress-time traces in the plates were computed by using the Johnson-Cook（J-C）, Zerilli-Armstrong（Z-A） and Steinberg-Cochran-Guinan（S-C-G） constitutive models. Comparison between the experimental and computational results indicates that the peak stresses in the plates computed by the three constitutive models are consistent with the experiments, while the deformations of the cylinder computed by the Z-A and S-C-G models, are more agreeable to the experiments than the J-C model. but, when the impact velocity is 500 m/s, the computed results by the three constitutive models appear markedly different from one another.

关 键 词：固体力学 本构模型 冲击实验 高导无氧铜 圆柱 平板 

分 类 号：O347.3[理学—固体力学]