| 摘要 |
A self-piercing rivet for forming joints in high strength steel has a partially hollow shank of a particular form in order to ensure that it has sufficient column strength to pierce the material. The thickness of the shank is such that adequate joint strength is achieved with a lower degree of flare than would be necessary for conventional riveted joints. The ratio of the thickness of the shank (outside diameter minus inside diameter) is in the range 0.47 to 0.52. The ratio of the cross sectional area of the shank in the region around the bore to the outside diameter of the shank is in the range 3.0:1 to 3.6:1
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