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Fracture Analysis of Thick Plate for Partial Penetration Multi-pass Weldment Using J-integral

J-적분을 이용한 후판 부분용입 다층용접재의 파괴 해석

  • Kim, Seok (Defense Quality Assurance Agency) ;
  • Song, Jung-Il
  • 김석 (국방품질관리소) ;
  • 송정일 (창원대학교 기계공학과)
  • Published : 2002.02.01

Abstract

Partial penetration welding joint is defined as groove welds welded from one side, without steel backing or groove welds welded from both sides but without back gouging. So it has an unwelded portion at the root of the weld. Study of partial penetration weldment fracture behavior includes residual stress analysis and fracture analysis. The J-integral loses its path independency in residual stress field. Therefore, it is necessary to introduce a new J-integral, J, which is defined including the effect of plastic deformation and thermal strain. In this study, theoretical formulation and program were developed for the evaluation of J-integral for the crack tip located in the weldment. Evaluations of fracture behavior were performed for partial penetration multi-pass weldment of 25.4mm thick plate by J-integral. From a point of fracture in partial penetration multi-pass welding, it seemed to be better to control root face smaller than 6.35mm.

Keywords

Partial Penetration Welding;Multi-Pass Weld;J-integral;Fracture Analysis

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