Fatigue crack propagation from a precrack under combined torsional and axial loading

被引:8
作者
Tanaka, K [1 ]
Akiniwa, Y [1 ]
Kato, T [1 ]
Mikuriya, T [1 ]
机构
[1] Nagoya Univ, Dept Mech Engn, Nagoya, Aichi 4648603, Japan
关键词
body force method; crack-face contact; crack-propagation path; crack-propagation rate; fatigue crack; mixed-mode loading;
D O I
10.1111/j.1460-2695.2005.00861.x
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
Fatigue tests of crack propagation from a precrack in thin-walled tubular specimens made of a medium-carbon steel were performed under cyclic torsion with and without superposed static or cyclic axial loading. The stress ratio of cyclic loading was -1. The fatigue crack-propagation path from a precrack was compared with the predictions based on the maximum tangential stress criterion. The direction of fatigue crack propagation follows the direction of the maximum of the range of the tangential stress, Deltasigma(thetamax)(*), near the crack tip determined from the stress intensity factor (SIF) which was calculated by considering the contacts of crack faces at the minimum load. The SIF calculated from the actual crack path by using the body force method (BFM) showed that the mode II SIF range quickly approached zero after a small amount of crack extension. The crack-propagation rate decreased first and then increased with crack extension. The initial dip of the crack-propagation rate was caused by the development of crack closure with crack extension. As cracks extended a long distance, the propagation rate was faster than the uniaxial data. This acceleration of crack propagation was caused by excessive plasticity near the crack tip.
引用
收藏
页码:73 / 82
页数:10
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