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- W2095301669 abstract "Two-dimensional, plane strain, finite element analyses of strength-mismatched welded joints have been performed using the modified boundary layer formulation. The welds were idealized as two-material joints with the material interface running parallel to the crack, which was embedded in the weld material. The Rousselier ductile damage model was employed within the weld material to simulate crack extension due to the growth and coalescence of microvoids. By analysing models with different levels of material mismatching, weld dimensions and applied T-stress levels, it was possible to analyse the effects of crack tip constraint due to both material mismatching and specimen geometry on the fracture resistance of the weld material. The results show that material strength overmatching (where the weld material is stronger than the base material) reduces the level of constraint ahead of the crack, which can increase the resistance to fracture of the weld material. Conversely, material strength undermatching increases crack tip constraint, reducing the fracture resistance of the joint. By employing estimates for the crack tip constraint levels, QM , based on the applied load, level of material mismatching and weld region thickness, it has been possible to ‘order’ the J–resistance curves of overmatched joints by generating a family of J–QM loci which describe the effects of constraint on the fracture resistance of the weld material. However, it is shown that the QM-stress parameter is not capable of describing the effect of material strength undermatching on the fracture resistance of a joint, which can be much lower than that obtained from a high-constraint homogeneous specimen of weld material." @default.
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- W2095301669 date "2000-08-01" @default.
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- W2095301669 title "Damage mechanics models of ductile crack growth in welded specimens" @default.
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- W2095301669 doi "https://doi.org/10.1046/j.1460-2695.2000.00317.x" @default.
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