（1  兰州理工大学土木工程学院  730050；   2  苏州科技学院土木系  215011）
［提要］  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，通过对延性金属刻痕杆刻痕根部断裂应力场分析，推导了延性金属在应力三轴空间的微观裂纹形成准则。根据
铝合金和结构钢开孔板断裂试验的数值模拟结果，验证了该准则的普适性和精度。
［关键词］  断裂  延性金属  刻痕杆  应力三轴空间  裂纹形成准则
Crack Formation Criterion of Ductile Metal in Stress Triaxiality Space/Wang Wanzhen1，Gu Qiang2，Sun Yuping1(1 Lanzhou University of Technology， Lanzhou  730050，China； 2 University of Science & Technology of Suzhou， Suzhou 215011，China)
Abstract:Combining with the mechanics theory of yield and fracture of metal in classical mechanics and fracture mechanics, crack formation criteria of ductile metal in stress triaxiality space is deduced by studying fracture stress field in root of notched bar made by ductile metal. Comparing with results of numerical simulations and experiments of flat rectangular plates with a circular hole made of aluminum alloy and constructional steel, the effectiveness and accuracy of the crack formation criteria are verified in engineering application.
Keywords:fracture； ductile metal； notched bar； stress triaxiality space； crack formation criteria
*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(SB04200408，0416B.05)。