循环应力作用下紧固孔冷胀强化残余应力的衰减响应分析

 对冷胀强化孔残余应力衰减的有关问题以及试验结果进行了研究。以LY12CZ与LC4CS为基材的铝合金无衬套冷胀残余应力在外加循环应力作用下有明显的衰减趋势，并以不同速率形式反映了衰减的变化差异。根据冷胀强化最大临界值理论，提出了冷胀饱和度概念。针对衰减曲线的不同变化特征，分析了产生的原因、条件以及主要参数之间的影响作用。

ANALYSIS OF ATTENUATION RESPONSE FOR THE RESIDUAL STRESS OF COLD EXPANDED STRENGTHENING OF TIGHT HOLE UNDER APPLIED CYCLIC STRESS

A study is described on the attenuation of residual stress of a cold expanded hole and its experimental results. The residual stress of the cold expanded hole of aluminum alloy LY12CZ and LC4CS, when bush is not used, has an obvious trend towards attenuation, and the change in attenuation is characterized by different speed forms. According to the greatest critical value principle for cold expanded strengthening, this paper puts forward a concept of cold expanded saturation degree. In accordance with the different change features of the attenuation curves, the authors analyze the cause,condition and the effect among main parameters.