铸造E级钢CT试样疲劳裂纹扩展试验与仿真分析  

FATIGUE CRACK PROPAGATION TEST AND SIMULATION ANALYSIS OF CAST E-GRADE STEEL CT SPECIMEN

作　　者：王超[1] 朱涛[1] 肖守讷[1] 刘宇杰[2] 杨冰[1] 阳光武[1] 尹敏轩 徐京涛 WANG Chao;ZHU Tao;XIAO ShouNe;LIU YuJie;YANG Bing;YANG GuangWu;YIN MinXuan;XU JingTao(Traction Power State Key Laboratory,Southwest Jiaotong University,Chengdu 610031,China;School of Mechanics and Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学牵引动力国家重点实验室,成都610031 [2]西南交通大学力学与工程学院,成都610031

出　　处：《机械强度》2021年第2期281-286,共6页Journal of Mechanical Strength

基　　金：国家自然科学基金项目(51675446);国家自然科学基金联合基金项目(U1534209)资助。

摘　　要：为准确获取铸造E级钢材料的断裂力学参数,并研究该材料的裂纹扩展规律和影响因素,开展了铸造E级钢CT试样的疲劳裂纹扩展试验,并将材料的裂纹扩展速率采用Paris公式进行表征;以CT试样裂纹扩展计算模型为例,采用M积分数值方法计算了5组试样疲劳裂纹扩展长度与载荷循环周期结果,仿真与试验相对误差在10%以内,具有较好的一致性。通过进一步对比分析试验与仿真的误差原因,载荷幅值为主要误差要素,初始裂纹位置、扩展速率参数、裂纹长度参量影响较小,从而为复杂结构三维疲劳裂纹扩展规律的预测提供参考。In order to accurately obtain the fracture mechanics parameters of the cast E-grade steel material,and to study the crack propagation law and influencing factors of material,a fatigue crack growth test of the CT specimens of the cast E-grade steel was carried out.The Paris formula was used for characterization.Taking the crack growth calculation model of CT samples as an example,the fatigue crack growth length and load cycle period results of 5 groups of samples were calculated by using the M-integral numerical method.The relative error was within 10%,which had better consistency.Through further comparison and analysis of the reasons for the error between the test and the simulation,it is shown that the load amplitude is the main error factor,and the initial crack position,propagation rate parameters,and crack length parameters have little effect,so as to provide a reference for the prediction of three-dimensional fatigue crack propagation rules for complex structures.

关 键 词：铸造E级钢 疲劳裂纹扩展 CT试样 M积分 

分 类 号：TB302[一般工业技术—材料科学与工程] O346.1[理学—固体力学]