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首页> 外文会议>2011 IEEE International Conference on Intelligence and Security Informatics >Study on distributions of fatigue crack-nucleating particle sizes and cracks formation in aluminum alloy
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Study on distributions of fatigue crack-nucleating particle sizes and cracks formation in aluminum alloy

机译：铝合金疲劳裂纹成核粒径分布及裂纹形成研究

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The fatigue test for LY12 aluminum alloys specimens at various stresses and stress ratios were performed. The distributions of the crack-nucleating particle sizes and ratios were determined using scanning electron microscopy (SEM) measured from specimens fracture surfaces. The results show that the correlation between particles sizes and ratios versus fatigue lives. And with the increase of stress ratio, fatigue crack originated from deeper subsurface at the same maximal stress. With the increase of maximal stress, fatigue crack originated from shallower subsurface or surface at same stress ratio. It has been also observed that the incubated fatigue micro cracks source localizes at the triple junction adjacent particle boundaries. The calculated results show that microcracks could nucleate and propagate from a smaller particle under a higher stress ratio, which agree reasonably with experimental observation.
机译：对LY12铝合金试样在各种应力​​和应力比下进行了疲劳试验。裂纹成核粒径和比的分布是使用扫描电子显微镜（SEM）从样品断裂表面测量的来确定的。结果表明，颗粒尺寸和比例与疲劳寿命之间的相关性。随着应力比的增加，疲劳裂纹产生于相同最大应力下的更深的地下。随着最大应力的增加，疲劳裂纹起源于较浅的地下或表面在相同的应力比下。还已经观察到，温育的疲劳微裂纹源位于邻近颗粒边界的三重结处。计算结果表明，微裂纹可以在较高的应力比下从较小的颗粒中成核并扩展，这与实验观察相吻合。

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