Abstract
In this work, we propose a model for predicting fatigue damage in friction stir spot welded (FSSW) joints made of Mg AZ31 alloy. In this modeling approach, an attempt is made to capture failure mechanisms due to the influence of variation in welding parameters including tool plunge depth, tool rotation speed, and tool pin diameter. As such, the fatigue model presented here is a deterministic approach, where fatigue lifetimes are estimated based on specific geometrical and micro structural information. In particular, the model addresses the observed variation in failure mechanisms commonly observed in Mg FSSW coupons under a range of applied loading. Further, a distinction is made between fatigue crack incubation, micro structural small and physically small fatigue crack growth, and finally long crack growth of the coupon. The fatigue model presented here showed good correlation for fatigue lifetimes for variation in welding conditions.
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© 2013 TMS (The Minerals, Metals & Materials Society)
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Rao, H.M., Jordon, J.B. (2013). A Multi-stage Approach for Predicting Fatigue Damage in Friction Stir Spot Welded Joints of Mg AZ31 Alloy. In: Hort, N., Mathaudhu, S.N., Neelameggham, N.R., Alderman, M. (eds) Magnesium Technology 2013. Springer, Cham. https://doi.org/10.1007/978-3-319-48150-0_32
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DOI: https://doi.org/10.1007/978-3-319-48150-0_32
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