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首页> 外文会议>17th European conference on fracture : Multilevel approach to fracture of materials, components and structures : Book of abstracts amp; proceedings on CD ROM >Effect of various drilling procedureson the fatigue life of rivet holes
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Effect of various drilling procedureson the fatigue life of rivet holes

机译：各种钻孔工艺对铆钉孔疲劳寿命的影响

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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 field’s distribution and to stress localization in the drilled zonesrnwhich will be affecting the fatigue life of 2024-T3 aluminium alloy. In addition the machiningrnprocess used for drilling can increase or decrease the fatigue life of materials. This paper presentsrnthe results of an experimental study whose main objective was to determine which drillingrnprocedure least affect the fatigue life and to show the role of the residual stresses introduced byrneach process on the fatigue behaviour of material. For that four drilling procedures are compared inrnfatigue: Direct drilling bit of the wanted diameter, drilling a small diameter hole called a pilot holernin the rivet hole location prior to drilling the final diameter using a reamer, water jet and finallyrnpunching. Hole’s quality is compared in two parameters: Conicity and surface quality which willrnbe observed using a scanning electron microscopy (SEM). X-ray diffraction is used to determinernthe residual stress profile resulting of each drilling procedures.
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，这将影响2024年的疲劳寿命-T3铝合金。另外，用于钻孔的加工过程可以增加或减少材料的疲劳寿命。本文介绍了一项实验研究的结果，其主要目的是确定哪种钻孔程序对疲劳寿命的影响最小，并说明每种工艺引入的残余应力对材料疲劳行为的作用。为此，比较了四种钻孔过程的疲劳程度：直接钻出所需直径的钻头，在使用铰刀，水刀和最终冲孔钻出最终直径之前，先在铆钉孔的位置钻一个称为导向孔的小直径孔。在两个参数中比较孔的质量：锥度和表面质量，这将使用扫描电子显微镜（SEM）进行观察。 X射线衍射用于确定每个钻孔过程产生的残余应力分布。

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