레이저용접부의 파괴에 미치는 잔류응력의 영향

• 영문명: The Effect of residual stress for fracture behavior in the laser weldment
• 발행기관: 한국레이저가공학회
• 저자명: 조성규 양영수
• 간행물 정보: 『한국레이저가공학회 학술대회 논문집』2006년도 춘계학술발표대회 논문집, 3~8쪽, 전체 6쪽
• 주제분류: 공학 > 기계공학
• 파일형태: PDF
• 발행일자: 2006.06.01

영문 초록

  The integrity of laser welded structures is decided with fracture strength and fatigue strength. This study presents fracture behavior considering residual stress in the laser welding. Experiments are conducted and analyses are performed to explore the influence of residual stress on fracture behavior of bead-on laser welded compact specimen. Fracture experiments are performed using ASTM 1820. The performed analyses included thermo-elasto-plastic analyses for residual stress and subsequent J-integral calculation. A modified J integral is calculated in the presence of residual stresses. The J-integral is path-independent for combination of residual stress field and stress due to mechanical loading. The results indicates that the tensile residual stress near crack front bring the low fracture load while the compressive residual stress bring the high fracture load compared to no residual stress specimen. These results quantitatively understand the influence of residual stress on fracture behavior.

목차

ABSTRACT
1. 서론
2. 실험 및 유한요소해석
3. 결과 및 고찰
4. 결론
논문 후기
참고문헌

키워드

Laser welding J-integral Residual stress Fracture mechanics