Influence of the transient material behaviour in the fatigue life estimation under random loading

被引：2

作者：

Tomasella, A. ^{[1
]}

Wagener, R. ^{[2
]}

Melz, T. ^{[1
,2
]}

机构：

[1] Tech Univ Darmstadt, Chair Syst Reliabil & Machine Acoust SzM, Magdalenenstr 4, D-64289 Darmstadt, Germany

[2] Fraunhofer Inst Struct Durabil & Syst Reliabil LB, D-64289 Darmstadt, Germany

来源：

3RD INTERNATIONAL CONFERENCE ON MATERIAL AND COMPONENT PERFORMANCE UNDER VARIABLE AMPLITUDE LOADING, VAL 2015 | 2015年 / 101卷

关键词：

cyclic material behaviour; strain softening; mean stress relaxation; fatigue life estimation; local strain approach; DAMAGE;

D O I：

10.1016/j.proeng.2015.02.058

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The estimation of the fatigue life under variable amplitude loading is a fundamental step in the design phase. To consider variable amplitudes in the fatigue design the linear damage accumulation is applied, thus disregarding non linearity. When materials show cyclic hardening/softening, the hypotheses from Palmgren and Miner are not valid and this causes appreciable errors in the fatigue life estimation. Fatigue tests were carried out on the steel HC340LA. The influence of strain softening and mean stress relaxation is shown. A simplified method for considering this transient phase is presented. More accurate results can be achieved by applying this method. (C) 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

引用

页码：485 / 492

页数：8

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