1. Fatigue behaviour of dissimilar Al 5052 and Mg AZ31 resistance spot welds with Sn-coated steel interlayer.
- Author
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Sun, M, Behravesh, S B, Wu, L, Zhou, Y, and Jahed, H
- Subjects
FATIGUE (Physiology) ,WELDED joints ,CYCLIC loads ,MECHANICAL loads ,CRACK propagation (Fracture mechanics) - Abstract
The fatigue property of dissimilar spot welds between an aluminium alloy (AA5052) and a magnesium alloy (AZ31) was studied in this research. The AA5052 and AZ31 coupons were resistance spot welded together by using an interlayer of Sn-coated steel between the two coupons. The fatigue test results revealed that the Mg/Al joints had the same level of fatigue strength as Mg/Mg resistance spot welds. It was found that within the life range of N
f < 105 cycles, Mg/Al welds degraded faster than Mg/Mg joints. This was attributed to the larger bending moment on the plane of fatigue failure in the Mg/Al welds. Three failure modes were observed under different cyclic loading regimes: Al/steel interfacial failure, Mg coupon failure and Al coupon failure. Fatigue fracture surface of Mg/Al welds consisted of two distinct regions: crack propagation region with brittle morphology and final rupture with ductile morphology. [ABSTRACT FROM AUTHOR]- Published
- 2017
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