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首页> 外文会议>Israel Annual Conference on Aerospace Sciences >RESIDUAL TENSILE STRESSES INDUCED BY COLD-WORKING A NEARBY FASTENER HOLE
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RESIDUAL TENSILE STRESSES INDUCED BY COLD-WORKING A NEARBY FASTENER HOLE

机译：通过冷加工附近的紧固件孔引起的残留拉伸应力

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摘要

During a spectrum component fatigue test performed at IAI, a crack initiated at a notched edge near a cold-worked fastener hole, and propagated towards the hole. Fractographic analysis confirmed that the crack initiated at the edge and grew towards the hole. Since the maximum measured stress in the notch was not sufficiently high to explain crack-initiation during the test, it was suspected that the tensile residual stresses at the edge contributed to the cracking. An experimental study was initiated in order to measure the tensile residual stresses induced by cold working at various edges located near cold-worked holes. Tensile residual stresses as high as 35 ksi were measured at an edge near a cold-worked hole. Finite-element analysis results showed good agreement with the experimental results. Fatigue analysis has shown that when these residual stresses are combined with high cyclic notch stresses that arise from external loading, the fatigue life at the edge can be drastically reduced.
机译：在IAI在IAI进行的频谱分量疲劳试验期间，在冷加工的紧固件孔附近的凹口边缘处引发的裂缝，并朝向孔繁殖。 Fretography分析证实，在边缘发起的裂缝并朝向孔增长。由于凹口中的最大测量应力不足以在测试期间解释裂缝引发，因此怀疑边缘处的拉伸残余应力有助于裂化。启动了实验研究，以测量在冷工作孔附近的各种边缘的冷加工诱导的拉伸残余应力。在冷加工孔附近的边缘测量高达35 ksi的拉伸残余应力。有限元分析结果表明与实验结果吻合良好。疲劳分析表明，当这些残留应力与外部负荷产生的高循环槽应力结合时，沿边缘处的疲劳寿命可以大幅减少。

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