Abstract
AbstractTowards a simple and robust model for void‐based fatigue prediction, we investigate the interaction of voids with its surrounding by using a multi‐field method. We couple the concentration fields of tin c1 and lead c2 with an additional field c3, where the latter is assigned with a void field. The interaction potential manifests three stable states. Two are obtained by experimental results of tin‐lead (SnPb) and the void stable state is postulated by construction. The logarithmic form of the thermodynamically consistent configurational entropy is approximated within this study by a fourth order polynom. It has been shown that the interfacial energy coefficient is independent of void's size, but rather depends numerically on the mesh size, which is used in the model presented here. Both governing equations follows a Cahn‐Hilliard‐type equation to mimic the microstructural changes. (© 2017 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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