铜基粉末冶金摩擦材料冲击临界应变率和本构失稳研究  

On impact critical strain rate and constitutive dis-stabilization

作　　者：刘建秀[1] 王红卫[1] 魏秀兰[1] 

机构地区：[1]郑州轻工业学院机电工程学院,河南郑州450002

出　　处：《郑州轻工业学院学报（自然科学版）》2005年第1期59-63,共5页Journal of Zhengzhou University of Light Industry:Natural Science

基　　金：河南省重点攻关项目资助(03230239000);河南省2000年杰出青年基金资助项目;中国工程物理研究院基金项目(421010201)

摘　　要：研究了铜基粉末冶金摩擦材料的组织结构及其静态和动态力学性能,为高速列车摩擦材料的研制提供参考.试验结果表明:1)该摩擦材料的破坏是以微裂纹等内部损伤的发展为前导的,高应变率下的绝热温升通过材料的热软化效应带来相应的应力降,部分抵消材料原有的应变率强化作用.2)通过实验发现硬质颗粒的粒度和形状直接影响着材料的强度.The institutional framework of Cu-P/M friction material,and its static behavior and dynamic mechanics performance were studied,which offers reference for the study of friction material in high-speed train.The result of the test indicated:1)The destruction of material was led to by the development of inside damage in the form of little crackle and the absolution thermal temperature rise caused the stress fall with thermal intenerate at high strain rate,the result counteract partly the strain-hardening effect. 2)The test result showed that the size and shape of hard partial were related with the strength.

关 键 词：铜基 本构 临界应变 失稳 粉末冶金 高应变率 强化作用 摩擦材料 高速列车 硬质颗粒 

分 类 号：TS101.9[轻工技术与工程—纺织工程] TG142.71[轻工技术与工程—纺织科学与工程]