용접지단부 TIG처리에 의한 피로강도향상 및 피로특성

• 영문명: Fatigue Strength Improvement and Fatigue Characteristics by TiG-Dressing on Weld Bead Toes
• 발행기관: 강원대학교 산업기술연구소
• 저자명: 정영화(Jung Young Hwa) 김익겸(Kim lk Gyeom) 남왕현(Nam Wang Hyone) 장동휘(Chang Dong Huy)
• 간행물 정보: 『산업기술연구』vol.20, 1~10쪽, 전체 10쪽
• 주제분류: 공학 > 공학일반
• 파일형태: PDF
• 발행일자: 2000.09.30

영문 초록

The 4-point bending tests have been performed in order to estimate the effect of TIG-dressing on fatigue strength and fatigue characteristics quantitatively for nonload-carrying fillet welded joints subjected to pure bending. As a result of fatigue tests, fatigue strengths of as-welded specimens have satisfied the grade of fatigue strength prescribed in specifications of korea, AASHTO and JSSC. Fatigue strength at 2 million cycles of TIG-dressing specimens have increased compared with as-welded specimens. As the result of beachmark tests, fatigue cracks occurred at several points, where the radius of curvature and flank angle in the weld bead toes were low, and grew as semi-elliptical cracks, then approached to fracture, As a result of finite element analysis, stress concentration factor in weld bead toes has closely related to the flank angle and radius of curvature, and between these, the radius of curvature has more largely mechanics approaches, the crack correction factor than flank angle. As a result of fracture mechanics approaches, the crack correction factor of test specimens has largely affected on stress gradient correction factor in case a/t is below 0.4 from the relations between stress intensity factor range estimated from FEM analysis and fatigue crack growth rate, fatigue life has been correctly calculated.

목차

Abstract

1. 서론

2. 실험

3. 실험결과 및 고찰

4. 유한요소해석

5. 파괴역학적 해석

6. 결론

참고문헌

키워드

TIG 처리 응력집중계수 피로강도 피로균열성장속도 응력확대계수범위 TIG-Dressing Stress Concentration Factor Fatigue Strength Fatigue Crack Growth Rate Stress Intensity Factor Range