Crack growth mechanism in precracked torsional fatigue specimens

被引：27
|
作者：
Makabe, C
Socie, DF
机构：
[1] Univ Ryukyus, Dept Mech Syst Engn, Okinawa 9030213, Japan
[2] Univ Illinois, Dept Mech & Ind Engn, Urbana, IL 61801 USA
来源：
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES | 2001年 / 24卷 / 09期
关键词：
crack opening; crack propagation; friction of crack surfaces; low cycle fatigue; micro-crack; shear bands; shear deformation;
D O I：
10.1046/j.1460-2695.2001.00430.x
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The mechanists of crack growth of precracked materials was investigated under cyclic torsion loading with and without axial static stress using 4340 steel. During the crack growth, branching of the crack was observed. The length of the crack between the first branching points was dependent on loading conditions. This length was longer when the applied shear amplitude and the static axial stress level were higher. When the crack tips were opened by the tension loads, the crack had the tendency to grow in a shear mode during cyclic torsion, It was found that friction of the crack surfaces prevented shear mode crack growth. Furthermore, at higher stresses the initiation of new microcracks was observed in front of the main crack and their density was dependent on loading conditions. This helped the crack grow in a shear mode before and after branching.
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页码：607 / 615
页数：9
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