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首页> 外文会议>Eighth International Fatigue Congress Vol.3, Jun 3-7, 2002, Stockholm, Sweden >FATIGUE CRACK PROPAGATION FROM NOTCH UNDER COMBINED TORSIONAL AND AXIAL LOADING
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FATIGUE CRACK PROPAGATION FROM NOTCH UNDER COMBINED TORSIONAL AND AXIAL LOADING

机译：扭转和轴向组合载荷下缺口的疲劳裂纹扩展

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摘要

Fatigue tests of crack propagation from a circular notch in thin-walled tubular specimens made of a medium-carbon steel were performed under cyclic torsion with and without superposed static and cyclic axial loading. The propagation path of Mode Ⅰ fatigue cracks followed the direction perpendicular to the maximum of the total range of the normal stress. The propagation rate was faster than the uniaxial data when compared at the same stress intensity range. The negative nonsingular stress induced excessive plasticity ahead of the fatigue crack, and then accelerated the fatigue crack. The J-integral range was proved to be an appropriate parameter for crack propagation with excessive plasticity under combined loading.
机译：在有和没有叠加的静态和循环轴向载荷的情况下，在循环扭转下，对中碳钢制薄壁管状试样中的圆形缺口的裂纹扩展进行了疲劳试验。 Ⅰ型疲劳裂纹的扩展路径沿垂直于法向应力总范围最大值的方向。在相同的应力强度范围内，传播速率比单轴数据快。负非奇异应力会在疲劳裂纹之前引起过多的可塑性，然后加速疲劳裂纹。事实证明，J积分范围是组合载荷下塑性过度扩展时裂纹扩展的合适参数。

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