Abstract
In order to reduce weight of a vehicle, application of light metals has increased. Magnesium alloy is very light and has high specific strength compared to other structural metals. SPR (Self Piercing Rivet) joining has been applied mainly for an aluminum alloy in motor industries. However, application of SPR joining to a magnesium alloy is very limited. In this study, SPR joining was carried out with AM50 magnesium alloy sheets. According to the result of joining experiment, cracking easily occurred at the lower sheet due to poor formability of the alloy. Static and fatigue strength of the joint were evaluated under shear tensile loading condition. The crack introduced in SPR process affects on strength of the joint. As a practical way to solve the problem, adhesive aided SPR joining was proposed. Adhesive was spread on the surface and then SPR joining was conducted before its hardening. The maximum shear tensile load of the joint increased by using an adhesive and was strongly influenced by kind of adhesive used. Fatigue strength also improved by using an adhesive. It is proposed that control for deformation due to SPR process at the edge of the joining area could be effective to improve the strength.
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