2.25Cr-1Mo复杂应力状态下低周疲劳寿命预测  

Life prediction of the low circumferential fatigue under the complicated stress condition of 2.25 Cr-1Mo.

作　　者：王正[1] 崔宁[2] 张振华[2] 郝俊文[3] 贾松峰 

机构地区：[1]大连理工大学 [2]抚顺石油学院 [3]华东理工大学

出　　处：《化工机械》1999年第6期323-326,361,共4页Chemical Engineering & Machinery

摘　　要：通过对无预裂纹圆柱形缺口试件的常温、高温低周疲劳总寿命试验以及对带有预裂纹圆柱形缺口试件的常温、高温裂纹扩展寿命试验，并利用ＮＨＲＤＳ有限元程序进行了缺口附近轴对称问题的循环应力和应变计算，研究了非均匀分布复杂应力状态下低周疲劳寿命。结果表明，２ ．２５Ｃｒ１Ｍｏ 材料复杂应力状态下低周疲劳总寿命和裂纹扩展寿命可采用当量形式的ＭａｎｓｏｎＣｏｆｆｉｎ 公式进行表征。The low circumferential fatigue life under the non avaraged distributive complicated stress condition was studied through the general life test of a cylinder notch specimen without prepared cracks at normal and high temperatures and the crack propogation life test of a cylinder notch specimen with prepared cracks at normal and high temperatures,and using NHRDS finite element program to make the calculations of the cyclic stress and cyclic strain of the axial symmetry near the notches.The result shows that the general life in low circumferential fatigue and the crack propagation life of 2.25Cr 1Mo under a complicated stress status might be characterized using Manson Coffin formula in equivalent form.

关 键 词：复杂应力状态 疲劳寿命 裂纹扩展 铬钼合金 

分 类 号：TG115.57[金属学及工艺—物理冶金] TG146.412[金属学及工艺—金属学]