【摘要】 铆接结构的疲劳寿命在很大程度上取决于孔边的微裂纹及其扩展,而铆接工艺参数对微裂纹的萌生与扩展影响显著。从细观角度分析铆接工艺参数对孔边细观结构的影响,探索铆接工艺参数对孔边细观结构的影响规律。采用试验方法,构建孔边细观结构表征参数,选择壁板与墩头和钉杆接触处圆角半径(MR)、孔边塑性层厚度(Md、MD)为表征的3个参数,分别研究了铆接工艺参数压铆力(Riveting Force)、镦铆过程时间(Riveting Process Time)、上铆头空腔(Upper Riveting Cavity)对孔边细观结构表征参数的影响规律。通过铆接工艺参数对孔边细观结构影响规律的研究,在装配连接时通过控制工艺参数实现对细观结构的改善,进而提高铆接结构的疲劳性能。更多还原

【Abstract】 The fatigue life of the riveted structure greatly depends on the meso-cracks around the hole and the crack expansion. Furthermore, the riveting process parameters have significant effect on the initiation and growth of the mesocracks. It is analyzed that how these parameters affect the mesoscopic quality of the areas around the hole in this paper.There are three parameters used to describe the mesoscopic structure around the hole. Here MR represents the fillet radius of the area where the panel touches the riveting head and rod. MD and Md are both the parameters for the plastic layer thickness around the hole. The effects of some riveting process parameters on the above three characterization parameters for the meso-structure around the hole are researched respectively, including riveting force, riveting process time and upper riveting cavity. This study helps to polish up the quality of the meso-structure through adjusting riveting process parameters,and get further improvements on the fatigue performance of the riveted structure.更多还原