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Residual stress effect on fatigue life of a cold worked rivet hole

机译:残余应力对冷加工铆钉孔疲劳寿命的影响

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摘要

The use of riveting as assembly technique, especially in the aeronautical construction,rnrequires the implementation of several holes in aluminium alloy sheets, which leads to anrninhomogeneous stress and strain fields distribution and to a stress localization in the drilled zonesrnwhich will be affect the fatigue life of 2024-T3 aluminium alloy.rnThe cold expansion is largely employed to obtain improvement in fatigue life of rivet holes. Thisrnpaper presents the results of an experimental work whose main objective was to evaluate the effectsrnof the residual stress field caused by the cold expansion of the hole on improving the fatigue lifernand on the crack initiation and propagation in the 2024-T3 aluminium alloy. X- ray diffraction isrnused to measure the residual stresses resulting of the cold expansion on the hole edge.
机译:使用铆接作为装配技术,特别是在航空结构中,要求在铝合金薄板上实施多个孔,这会导致应力和应变场分布不均匀,并导致钻孔区域的应力局部化,从而影响疲劳寿命。 2024-T3铝合金。冷膨胀主要用于提高铆钉孔的疲劳寿命。本文介绍了一项实验工作的结果,其主要目的是评估孔的冷膨胀引起的残余应力场对改善疲劳寿命以及对2024-T3铝合金中裂纹萌生和扩展的影响。使用X射线衍射来测量孔边缘冷膨胀产生的残余应力。

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