MnR钢在不同应力比下的疲劳裂纹扩展的试验研究及模拟.pdf

16MnR 钢在不同应力比下的疲劳裂纹扩展的 试验研究及模拟 1,2 1,2 1, 2 1, 2 3 4 , , , , ,Y. Jiang ( 1 , 310032;2 , 310032;3, 230031;4University of Nevada, Reno, Depart ent of Mechanical Engineering, Reno, NV 89557, USA) :采用38 厚带有圆形缺口的CT 试样,研究了16MnR 钢在不同应力比的恒幅循环载荷作 用下的疲 裂纹扩展开发了 一种基于疲 损伤的方法来模拟疲 裂纹扩展速率将16MnR 钢 的循环塑性本构模型通过用户材料子程序UMAT 嵌入到ABAQUS 中把有限元计算得到的疲 裂 纹尖端附近区域的弹塑性循环应力应变结果, 代入到疲 损伤模型中, 得到每个加载循环在裂尖各 点产生的疲 损伤值通过疲 损伤准则, 导出疲 裂纹稳定扩展速率的计算公式疲 裂纹扩 展试验验证了模拟结果实验结果和模拟结果都表明,该试样厚度下, 应力比对裂纹扩展速率几乎 没有影响 :疲劳裂纹扩展;应力比; 16MnR钢;疲劳损伤;有限元模拟 :TG145;TG11325 :A : 1001- 4837(2007)03- 0001- 07 An Experimental Study and Simulation of Fatigue Crack Propagation of 16MnR Steel 1,2 1,2 1,2 1,2 ZHUANG i- jian , GAO Zeng- liang ,WANG Xiao- gui , CHEN Bing- bing , 3 4 CHEN Xue- dong ,JIANG Y (1Institute of Process Equip ent and Control Engineering, Zhejiang University of Technology, Hangzhou 310032, China;2TheMOE Key Laboratory ofMechanical Manufacture and Auto ation, ZhejiangUniversity ofTechnology, Hangzhou 310032, China;3HefeiGeneralMachinery Research Institute, Hefei230031,Chi na;4University of Nevada, Reno, Depart ent of Mechanical Engineering, Reno, NV 89557, USA) Abstract:Fatigue crack growth behavior of 16MnR steel was experi entally studied using co pact speci ens subjected to different R - atio cyclic loading. The fatigue crack growth rate for 16MnR steel was si ulated based on da age ethod. The elastic- plastic stress- strain field nearthe crack tip under cyclic loading was co puted by using thefinite ele ent code(ABAQUS) with the i ple entation o