摘要
本文基于连续介质力学理论和最大拉应力准则 ,从能量的观点出发 ,根据能量守恒定律 ,提出了脆性材料的断裂应变能密度与断裂应变成线性关系 ,由此确定的平均应力为材料常数。并通过PMMA材料在不同应变率下的拉伸实验验证。同时通过表面银纹显微镜观察实验 ,研究了应变率对银纹密度的影响。
Based on the theory of continuum mechanics and maximum tensile stress criterion and conservation law of energy, this paper has proposed that fracture strain energy density of brittle materials is linear with their fracture strain, and that average stress decided by them is a material constant, which have been verified by PMMA materials tensile test at the different loading rates. At the same time, through the microscope test of surface, the effect on craze density by strain rate has been investigated as well.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2005年第1期92-95,共4页
Journal of Materials Science and Engineering
基金
国家自然科学基金资助项目 (1 0 372 0 87)
湖南省自然科学基金资助项目(0 1JJY2 0 0 1 )
关键词
应变能密度
断裂
应变率
失效准则
银纹密度
strain energy density
fracture
strain rate
failure criterion
craze density