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Fatigue behaviour of dissimilar Al 5052 and Mg AZ31 resistance spot welds with Sn-coated steel interlayer.
- Source :
- Fatigue & Fracture of Engineering Materials & Structures; Jul2017, Vol. 40 Issue 7, p1048-1058, 11p
- Publication Year :
- 2017
-
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<subscript>f</subscript> < 10<superscript>5</superscript> 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]
Details
- Language :
- English
- ISSN :
- 8756758X
- Volume :
- 40
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- Fatigue & Fracture of Engineering Materials & Structures
- Publication Type :
- Academic Journal
- Accession number :
- 123394619
- Full Text :
- https://doi.org/10.1111/ffe.12563