45钢复杂应力状态下低周疲劳损伤准则  

Damage criterion of low cycle fatigue of medium carbon steel under complicated stress state

作　　者：何雪宏 郭成璧[1] 

机构地区：[1]大连理工大学动力工程系

出　　处：《大连理工大学学报》1996年第2期203-207,共5页Journal of Dalian University of Technology

摘　　要：以单轴载荷条件下带有沟槽的轴对称试样作为基本模型，研究复杂应力状态下低周疲劳的损伤特性，对稳定循环阶段和非稳定循环阶段的损伤提出了不同的损伤定义．定义了局部有效应力损伤概念，并以此建立复杂应力状态下一种新的累积损伤准则．对４５钢低周疲劳损伤进行了分析．Axial symmetrical notched specimens under one-dimensional stress state are selected to be the basic research models to discuss the low cycle fatigue damage criterion under complicated stress state. Different definitions are given to the different damages of steady-cycle fatigue and unsteady-cycle tatigue. Local effective stress is defined to establish a new accumulated damage criterion under complicated stress state. Damage analysis is taken to the low cycle fatigue of medium carbon steel.

关 键 词：裂纹 疲劳寿命 复杂应力状态 钢 损伤 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG113.255[金属学及工艺—金属材料]