Numerical Investigations on Ductile Constraint near Crack Tip in Weldment with Mechanical Heterogeneity(Mechanics, Strength & Structure Design)

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The stress triaxiality near the crack tip can be used to reflect the ductile constraint in elastic plastic fracture mechanics of metallic materials. The J-integrals and stress triaxiality near the crack tip in a weldment with mechanical heterogeneity were numerically investigated. The effect of ductile constraint on the ductile fracture of the weldment with mechanical heterogeneity was also discussed. The standard three-point bend specimen was analyzed numerically in the plane strain condition. The mechanical heterogeneity of a mis-matched weldment is described by the matching property M, and the weld metal width parameter H/C. In order to keep the same image for the matching property effect on performance of the mis-matched weldment, it is supposed in this paper that the matching property M should be the ratio of the yielding strength of the weld metal to that of base metal in the condition of the same base metal yielding stress, and the ratio of the yielding stress of base metal to that of weld metal in the condition of the same weld metal yielding stress. The matching property of weldment and the width parameter of weld metal have a large effect on the stress triaxiality near crack tip. The larger the matching property is, the small the stress triaxiality near the crack tip. The stress triaxiality near the crack tip is dependent on the property of weld metal when the weld metal width parameter H/C is less than 0.63 in this investigation.
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Numerical Investigations on Ductile Constraint near Crack Tip in Weldment with Mechanical Heterogeneity(Mechanics, Strength & Structure Design)

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