空军工程大学学报（自然科学版）2011，Vol.12Issue(6)：79-82,4.DOI:10.3969/j.issn.1009-3516.2011.06.016
给定存活率下45钢的疲劳寿命估算
Fatigue Life Prediction for 45 Steel with Given Survivability
摘要
Abstract
Based on the critical damage principle, a new prediction model for fatigue crack initiation life (FCIL) is developed through taking the cyclic damage strain range as the damage parameter. Correlations between the mono-tonic tensile data and two of the material constants (the stress fatigue - resisting coefficient and the theoretical fatigue threshold) in the proposed FCIL prediction model are founded as well. In contrast to Zhengs model, the fatigue ductility exponent contained in the proposed FCIL prediction model is a material constant which doesn't identically equal to the constant value -0.5. Besides, the fatigue ductility exponent shows the damage resistance ability of the material. The expressions of fatigue life curves with given survivability ( PSN curves) for 45 steel notched specimen are developed on the basis of the proposed FCIL predication model. In comparison with the Zhengs model - based PSN curves, the new PSN curves can be used to predict the fatigue life with given survivability of 45 steel better.关键词
寿命预测/FCIL估算模型/PSN曲线/45钢Key words
life prediciton/FCIL prediction model/PSN curve/45 steel分类
数理科学引用本文复制引用
刘嘉,李静,杨友社,李强,张忠平..给定存活率下45钢的疲劳寿命估算[J].空军工程大学学报（自然科学版）,2011,12(6):79-82,4.基金项目
空军工程大学研究生科技创新计划资助项目(DX2010403) （DX2010403）
