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.
出处
《机械科学与技术》
CSCD
北大核心
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
