粉末冶金盘中夹杂位置随机性的裂纹扩展失效概率分析方法

摘要

根据非金属夹杂在粉末冶金合金中的分布特点，提出了夹杂分布模型。在此基础上提出的裂纹扩展失效概率分析方法，能考虑夹杂空间位置随机性及扩展过程中的裂纹合并情况。文中对对某型发动机粉末冶金涡轮盘进行失效概率分析。%In the paper, a model is established according to the distribution of non-metallic inclusions in powder metallurgy(PM) alloys. Based on the model, a failure probability analysis method of crack growth is presented which takes the randomness of inclusions′ position into consideration. A PM disk is used as an example in the paper.