摘要
结合经典力学和断裂力学对金属屈服和断裂解释的力学原理,提出了刻痕杆刻痕根部亚表层屈服和开裂的近似重合性假设.通过对铝合金深槽刻痕杆刻痕根部亚表层断裂应力场的数值分析和等效简化,导出了常温下铝合金在应力三轴空间宏观脆断强度的上、下限建议值分别为:σUF=2σY和σLF=σY/(1-μ).铝合金低温下断裂模式的定性剖析结果显示,建议的断裂准则能较好地解释铝合金低温试验中的脆断现象.最后,将铝合金宏观脆断机理和抗断设防结合起来,给出了铝合金常低温下的抗断设防框架及建议.
By combining mechanics theory of metal material yield and fracture in classical mechanics with fracture mechanics, simultaneity hypothesis of yield and fracture was brought forward in sub-surface of notched root. By study and equivalent simplification of fracture stress field in notched root , lower and upper limits of aluminum alloy brittle fracture strength in stress triaxiality space were deduced as follows respectively：σLF=σY/（1-μ）andσUF=2σY. Qualitative analysis results of aluminum alloy at low temperature revealed that the suggested fracture criterion could well explain brittle fracture phenomenon of aluminum alloy at low temperature. As conclusions, fracture design frame and recommendations of aluminum alloy at atmospheric or low temperature were put forward.
出处
《西安建筑科技大学学报（自然科学版）》
CSCD
北大核心
2007年第3期386-390,共5页
Journal of Xi'an University of Architecture & Technology(Natural Science Edition)
基金
甘肃省自然科学基金资助项目(3ZS051-A25-044)
兰州理工大学科研发展基金资助项目(SB042004080416B-05)
关键词
屈服
断裂
铝合金
刻痕杆
应力三轴空间
yield
fracture
metal material
notched bar
stress triaxiality space
