冲击载荷下铜基粉末冶金材料性能及本构关系研究  

Study of Cu-P/M Friction Material′s Properties and Constitutive Relation under Impact Load

作　　者：邵建敏[1] 刘建秀[1] 李蔚[1] 韩长生[2] 

机构地区：[1]郑州轻工业学院,郑州450002 [2]中国工程物理研究院流物所,绵阳621900

出　　处：《机械科学与技术》2005年第6期689-692,共4页Mechanical Science and Technology for Aerospace Engineering

基　　金：中国工程物理研究院基金项目(421010201);河南省杰出青年基金项目;河南省重点攻关项目(03230239000)资助

摘　　要：在hopkinson压杆上做了铜基粉末冶金摩擦材料的冲击压缩试验。结果表明:在1000/s应变率以下时,材料表现为应变率强化效应;在1000/s应变率以上时,材料表现为应变率弱化效应。得出结论:应变率1000/s为材料的临界应变率。根据实验得出的应力应变曲线,在朱王唐模型的基础上加入表征材料粘性特征的塑性项,对试验曲线进行数值模拟,取得了较好效果,填补铜基粉末冶金摩擦材料在冲击动态参数上的空白,为工程应用提供了理论依据。Impact compress tests of Cu-P/M friction material were conducted on Hopkinson pressure bar. The result shows that strain rate hardening effect was observed at rates under 1000/s, whereas weakening effect was seen at higher rates, which means that 1000/s is the critical shock strain rate. Based on the stress-strain test curve and Zhu-Wang-Tang model, adding the plastics term that had the visco properties, it fits the test curve. The fitted curve is satisfactory.

关 键 词：铜基粉末冶金 摩擦材料 冲击 应力 应变 本构方程 

分 类 号：TG14[一般工业技术—材料科学与工程]