摘要
介绍了一种利用相对Ｍｉｎｅｒ法则估算构件在变幅载荷谱下裂纹形成寿命的当量Ｓ－Ｎ曲线方法。与常规的名义应力法相比，此方法不用常幅试验下得到的Ｓ－Ｎ曲线，而是根据该构件在两种载荷谱下的疲劳试验寿命，推导出能反映在变幅载荷谱条件下构件疲劳特性的当量Ｓ－Ｎ曲线，并以此当量Ｓ－Ｎ曲线为依据进行寿命估算。运用此方法，本文对文献［１］所给六种载荷谱下的试片寿命进行了计算，并以试验寿命为依据对按常规Ｓ－Ｎ曲线法修正的Ｓ－Ｎ曲线法、局部应力应变法和本文当量Ｓ－Ｎ曲线法所估算出的结果进行了比较，结果表明。本文所介绍的方法不仅简单实用，而且精度要明显高于其他几种方法。
A method for predicting fatigue life of coupon (or component) under variable amplitude loading byusing equivalent(eq.)S-N curve was presented in this paper。The eq,S-N curve can be derived from test re-sults under two load spectra. The theoretical derivation of eq.S-N curve was given,Life predictiqns of specimenunder several different spectra was made using the eq.S-N curve, Fatigue life predictions by this method andseveral other methods were compared with test results. It has been shown that the accuracy of fatigue life predic-tions by this method is higher than those by other methods.
出处
《机械强度》
CAS
CSCD
北大核心
1994年第1期50-53,共4页
Journal of Mechanical Strength
关键词
疲劳寿命
估算
疲劳裂纹
形成
fatigue,life,prediction. fatigue crack,initiation
