Dependence of J-integral and Failure Assessment Diagram on Strength Mismatching and Crack Length for Welded Joint Specimen(Mechanics, Strength & Structure Design)

概要

論文の詳細を見る
In this paper five kinds of strength matching weldments are considered. The degree of matching is defined by the match factor M, a ratio of yield strength of weld metal to that of parent metal. The values of M are chosen to be 1.4, 1.2, 1.0, 0.8 and 0.6, respectively. Five typical ratios of half crack length to half specimens width from shallow to deep: a/W=0.1, 0.175, 0.25, 0.375 and 0.5 are assumed. Center-cracked panel (CCP) specimens with weld joints are numerically analyzed by using the elastic-plastic finite element method. The emphasis is placed on the effects of the strength matching factor and the crack length on the J-integral as well as the shape of the failure assessment curve (FAC). The most complex option, termed as option 3 in the third revision of R6, is used to generate the FAC. It is demonstrated that the strength mismatching of a welded joint has a great influence on the value of the J-integral and the shape of FAC, but the influence of crack length is relatively small. The increase of M for cases the with same value of a/W expands the safe region in the failure assessment diagram (FAD), and conversely a decrease of M makes it contract. From the numerical results, it is concluded that when making a failure assessment for the initiation of fracture from defects in a welded structure, the FAC obtained by using the finite element method under the conditions of real mismatched joints should be adopted. However, when option 1 or option 2 are selected, the engineering formulae of these two options should be revised in consideration of the influence of strength mismatching of welded structures.
大阪大学の論文

Dependence of J-integral and Failure Assessment Diagram on Strength Mismatching and Crack Length for Welded Joint Specimen(Mechanics, Strength & Structure Design)

スポンサーリンク

概要

著者

関連論文

スポンサーリンク