Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Fracture Analysis of Spot-Welds with Edge Cracks using 2-D Hybrid Special Finite Element

이차원 하이브리드 요소를 이용한 균열을 내포하는 용접점의 유한요소 파단해석

  • 송정한 (한국과학기술원 기계공학과) ;
  • 양춘휘 (한국과학기술원 기계공학과) ;
  • 허훈 (한국과학기술원 기계공학과) ;
  • 김홍기 (POSCO 기술연구소) ;
  • 박성호 (POSCO 기술연구소)
  • Published : 2004.10.01
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Abstract

This paper employed a systematic analysis using a 2-D hybrid special finite element containing an edge crack in order to describe the fracture behavior of spot-welds in automotive structures. The 2-D hybrid special finite element is derived form a mixed formulation with a complex potential function with the description of the singularity of a stress field. The hybrid special finite element containing an edge crack can give a better description of its singularity with only one hybrid element surrounding one crack. The advantage of this special element is that it can greatly simplify the numerical modeling of the spot welds. Some numerical examples demonstrate the validity and versatility of the present analysis method. The lap-shear, lap-tension and angle-clip specimens are analyzed and some useful fracture parameters such as the stress intensity factor and the initial direction of crack growth are obtained simultaneously.

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References

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