复合型启裂韧度 J_(MC) 的测定方法和断裂准则的探讨  

Study on the Measurement of Fracture Toughness J MC and Fracture Criterion under Mixed Mode Ⅰ+Ⅱ Loading

作　　者：沙江波[1] 邓增杰[1] 周惠久[1] 

机构地区：[1]西安交通大学

出　　处：《西安交通大学学报》1997年第8期87-92,98,共7页Journal of Xi'an Jiaotong University

基　　金：国家教委博士点基金

摘　　要：应用有限元方法和断裂实验对铝合金材料Ｌｙ１２和４０ＣｒＮｉＭｏ钢在Ⅰ＋Ⅱ型载荷下启裂韧度ＪＭＣ的测定方法及弹塑性断裂行为进行了研究，给出了２种材料复合断裂的Ｊ积分准则．结果表明：１）根据复合型ＪＲ阻力曲线，应用裂纹延伸区零扩张量法测定的不同复合比下的启裂韧度ＪＭＣ值能够满足工程精度，且简便易行；２）不同复合比下的启裂韧度ＪＭＣ值满足一定的关系式．只要能得到材料的ＪⅠＣ、ＪⅡＣ值，任何复合比下的ＪＭＣ值都可由一定的关系式计算得到．另外。The elastic plastic fracture behavior and the measurement method of fracture toughness J MC in Ly12 and 40CrNiMo under mixed mode Ⅰ+Ⅱ loading were studied with the finite element method and fracture test. The mixed mode elastic plastic fracture criterion was proposed. The results show that 1) Based on the mixed mode J R resistance curve, it is easy to implment the method of zero extension of crack tip stretch zone for measuring the fracture toughness J MC under mixed Ⅰ+Ⅱ mode loading, and the measurement result can meet engineering precision reqairement; 2) The fracture toughness J MC of different mixed ratios satisfies certain equation, from which the J MC with arbitrary mixed ratios can be obtained if J Ⅰc and J Ⅱc of the material are known.

关 键 词：复合型 启裂韧度 断裂准则 金属材料 

分 类 号：TG111.91[金属学及工艺—物理冶金]