2.25Cr-1 Mo复杂应力状态下低周疲劳裂纹扩展规律研究  

STUDY ON FATIGUE CRACK PROPAGATION OF 2.25Cr-1Mo STEEL UNDER COMPLEX STRESS STATE

作　　者：王正[1] 何鑫[2] 崔宁[2] 贾松峰[2] 

机构地区：[1]大连理工大学动力工程系,大连116023 [2]抚顺石油学院机械系,抚顺113001

出　　处：《机械强度》2001年第3期341-343,349,共4页Journal of Mechanical Strength

基　　金：辽宁省自然科学基金资助项目 (972 0 53);中石化集团公司资助项目 (X3980 1 8)~~

摘　　要：通过对 2 .2 5Cr 1Mo材料进行不同温度下的低周疲劳试验 ,并应用NHRDS有限元程序进行裂纹尖端各应力应变分量 ,各当量弹、塑性应变范围的计算 ,利用当量J积分范围 ,研究了该材料在复杂应力状态下的低周疲劳裂纹扩展规律。结果表明 ,在复杂应力状态下 2 .2 5CrLow cycle fatigue tests were carried out on 2.25Cr-1Mo steel notched cylinder specimens under strain range control at three different temperatures. The three-dimension stressed and strains within the specimens were calculated by the NHRDS(two-surface model within non-harden region) program. The equivalent stress ranges, equivalent elastic and plastic strain ranges at the crack tip were used to compute equivalent J-integral ranges which were employed to study the fatigue crack propagation. The results showed that crack propagation rate of this material under complex stress state can be characterized by the equivalent J-integral range.

关 键 词：复杂应力状态 裂纹扩展速率 当量J积分范围 温度 低周疲劳 石油化工设备 

分 类 号：TE96[石油与天然气工程—石油机械设备] TG142.33[一般工业技术—材料科学与工程]