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Effect of Strength of Mismatch Interface on Crack Driving Force

Abstract. A welded joint is a critical part of a welded structure with respect to defects, pores, geometry, misalignments, and mechanical anisotropy. Differences in the mechanical properties appear between weld metals, heat affected zone, and base metal. Crack growth resistance curves, e.g., determined in terms of crack tip opening displacement (CTOD), exhibit variations in the crack growth resistance of the welded joint as a consequence of the local variations in the material properties. Theoretical investigations have shown that also the local near-tip crack driving force (CDF) may deviate strongly from the far-field CDF, if the material properties vary locally. The reason is that the material inhomogeneity induces an additional CDF-term, called the material inhomogeneity term, Cinh, which leads to a shielding or anti-shielding of the crack tip. A model developed by Simha et al. is applied to evaluate the magnitude of Cinh in a welded joint with a strength mis-match interface. Both a stationary and a propagating crack are considered.