Effect of Crack Depth and Strength Mis-Matching on the Relation between J-integral and CTOD for Welded Tensile Specimens(Mechanics, Strength & Structure Design)

概要

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In the present studies the effects of strength mis-matching of materials, crack length, and weld width on the relation between the J-integral and the crack tip opening displacement (CTOD) have been investigated using an elastic plastic finite element method available in ABAQUS The analysis is performed for a center-cracked welded specimens with strength mis-matching from M=0.8 to 1.2, crack length from a/W=0.1 to 0.5, and weld width from h/c=0.1 to 0.5. Effects of the strength mis-matching and the crack length on the plastic constraint factor are also discussed in detail. The main results indicate that the strength mis-matching of materials has no influence on the relation between the J-integral and CTOD in elastic and small-scale yield regime. With increasing the load, effect of strength mis-matching appears to be notable. The plastic constraint factor investigated here may include the effect of the strength mis-matching on the local plastic deformation of welded joints. The crack length has a strong influence on the relation between the J-integral and CTOD as well as the constraint factor. Furthermore, the investigation indicates that the weld width appears to have no effect on the relation between the J-integral and CTOD, with the exception of very narrow weld widths.
大阪大学の論文