THE EFFECTIVE FATIGUE THRESHOLD - SIGNIFICANCE OF THE LOADING CYCLE BELOW THE CRACK OPENING LOAD

被引：30
|
作者：
CHEN, DL
WEISS, B
STICKLER, R
机构：
[1] Institute for Physical Chemistry Department of Materials Science, University of Vienna, A-1090 Vienna
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 1994年 / 16卷 / 07期
基金：
中国国家自然科学基金; 美国国家科学基金会;
关键词：
FATIGUE THRESHOLD; CRACK PROPAGATION; CRACK CLOSURE; EFFECTIVE FATIGUE THRESHOLD; COPPER; ALUMINUM; STEEL;
D O I：
10.1016/0142-1123(94)90199-6
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Experiments were carried out to demonstrate the validity of a new concept for the evaluation of the effective fatigue threshold values for loading conditions with K(min) below the crack opening value. For this, load-CTOD curves were determined for different R-ratios keeping K(th,max) constant and reducing K(min) below K(th,min), which resulted in a resumption of the fatigue crack growth. This observation is explained on the basis of a new closure evaluation, which takes into account the total range of CTOD to affect the driving force for fatigue crack growth. Three methods to measure the effective threshold values are proposed and critically compared. Experimental data are given for Cu, high-strength Al alloys and a dual-phase steel.
引用
收藏
页码：485 / 491
页数：7
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