复杂应力状态下镍基单晶合金低周疲劳寿命预测模型  

A Model of Multiaxial Low Cycle Fatigue Life Time of a Nickel Base Single Crystal

作　　者：岳珠峰[1] 吕震宙[1] 

机构地区：[1]西北工业大学,西安710072

出　　处：《稀有金属材料与工程》2000年第1期28-31,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金! (批准号 :5 95 0 10 0 9);航空科学基础研究基金

摘　　要：镍基单晶合金的低周疲劳(LCF)晶体取向相关性和其弹塑性的晶体取向相关性有密切关系,基于所建晶体取向各向异性弹塑性晶体滑移模型,本文推导了复杂应力状态下镍基单晶合金低周疲劳寿命预测模型,结论为LCF寿命与修正的滑移应变呈指数关系。在详细分析薄壁圆筒试样受拉扭载荷下应力应变分布规律的基础上,利用不同拉扭载荷下的低周疲劳寿命数据,对本文所提模型进行了成功的考核。Based on the anisotropic crystallographic theory, a model of low cycle fatigue (LCF) life time of a nickel base single crystal in a multiaxial stress state is proposed. The model indicates that LCF life time has a power relationship to total shear strain of modified octahedral slip. The detail distributions of stress and strain in a hellow cylinder specimen under tension torsion LCF loadings are analyzed in detail. The LCF life time model has been confirmed successfully using the results of tension torsion LCF tests of CMSX 2 NI base single crystal superalloy.

关 键 词：镍基 单晶 超合金 低周疲劳寿命 晶体塑性理论 

分 类 号：TG113.25[金属学及工艺—物理冶金]