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首页> 外文学位 >Fatigue of self-piercing riveted joints in 5754 aluminum alloy sheets.
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Fatigue of self-piercing riveted joints in 5754 aluminum alloy sheets.

机译：5754铝合金薄板的自冲铆接接头疲劳。

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摘要

Self-piercing riveting is emerging as a strong alternative to spot welding for joining aluminum sheets. Self-piercing riveting is the pressing of semi-tubular rivets into two overlapping sheets. Flaring out of the rivet in the bottom sheet creates a mechanical interlock between the sheets. Sometimes self-piercing riveting is combined with adhesive to improve the joint strength. Previous studies have shown that self-piercing riveted joints in aluminum alloys have a longer fatigue life than spot-welded joints.;Since cold forming during self-piercing riveting operation can significantly alter the material properties and influence the fatigue failure of self-piercing riveted joints, the first part of the thesis was involved in determining the effect of cold work on the fatigue life of AA5754 alloy. It was observed that introducing of a hole by either drilling or punching greatly decreased the fatigue strength. However, the fatigue strength of punched-hole specimens was greater than the drilled-hole specimens, presumably due to cold work induced by punching.;Failure of self-piercing riveted joints in AA5754 under fatigue was either due to conventional fatigue or due to fretting depending on the sheet thickness combination. Conventional fatigue cracks were observed in the top substrate collar slightly away from the hole boundary, whereas fretting was observed around the hole edge on the faying surfaces of the two sheets. The former was due to high longitudinal tensile stresses, while the latter was due to lack of interlocking between the sheets and slippage at the contacting surfaces. The rivet-bonded joints showed a significantly better fatigue performance than the self-piercing riveted joints. The typical paint baking condition used in the auto industry did not affect the fatigue of self-piercing riveted joints. Ring coining improved fatigue life of self-piercing riveted joint; however, the degree of improvement depended on the coining condition and the sheet thickness combination.
机译：自穿孔铆接作为连接铝板的点焊的强大替代品正在出现。自冲铆接是将半管状铆钉压制成两个重叠的薄片。底板上的铆钉向外张开，在底板之间形成机械互锁。有时将自冲铆钉与粘合剂结合使用以提高接头强度。以前的研究表明，铝合金的自冲铆接接头比点焊接头具有更长的疲劳寿命;由于自冲铆接过程中的冷成型会显着改变材料性能并影响自冲铆接的疲劳破坏接头，论文的第一部分涉及确定冷作对AA5754合金疲劳寿命的影响。观察到通过钻孔或冲压而引入孔大大降低了疲劳强度。但是，穿孔试样的疲劳强度要比钻孔试样大，这可能是由于冲压引起的冷作。疲劳下，AA5754的自冲铆接接头失效是由于传统疲劳或由于微动引起的。取决于板材厚度的组合。在顶部基片轴环稍微远离孔边界的地方观察到了常规的疲劳裂纹，而在两张薄片的接合面的孔边缘周围观察到了微动。前者归因于高的纵向拉伸应力，而后者归因于片材之间缺乏互锁和接触表面打滑。铆钉连接的接头比自穿孔铆钉的接头具有明显更好的疲劳性能。汽车行业使用的典型烤漆条件不会影响自穿孔铆钉接头的疲劳。环形压印提高了自冲铆接接头的疲劳寿命；但是，改善程度取决于压印条件和片材厚度的组合。

著录项

  • 作者

    Jin, Zheng.;

  • 作者单位

    University of Michigan College of Engineering Graduate Professional Programs.;

  • 授予单位 University of Michigan College of Engineering Graduate Professional Programs.;
  • 学科 Engineering Automotive.;Engineering Mechanical.;Engineering Industrial.
  • 学位 D.Eng.
  • 年度 2005
  • 页码 177 p.
  • 总页数 177
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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