Low cycle fatigue assessments of corner welded joints based on local strain approach

• Published in: International journal of steel structures Vol. 14; no. 3; pp. 579 - 587
• Main Authors: Hanji, Takeshi, Park, Jin-Eun, Tateishi, Kazuo
• Format: Journal Article
• Language: English
• Published: Heidelberg Korean Society of Steel Construction 01.09.2014; 한국강구조학회
• Subjects: Civil Engineering; Engineering; Materials Science; Solid Mechanics; 토목공학; low cycle fatigue strength; effective notch strain; corner welded joints
• ISSN: 1598-2351; 2093-6311
• DOI: 10.1007/s13296-014-3015-8

Low cycle fatigue strengths of corner welded joints with single bevel groove welding were studied. Low cycle fatigue tests were performed with three types of specimens which have different sizes of weld root face. The test results indicated that the low cycle fatigue strength of the corner welded joints strongly depends on the weld root size. Then, the fatigue strength of the corner joints was evaluated based on the effective notch strain at the weld root tip which was calculated by elasto-plastic finite element analyses. A unique relationship between the effective notch strain and the fatigue life of the joint was observed regardless of the weld root size. Therefore, it was revealed that the effective notch strain approach is applicable to evaluate the low cycle fatigue strength of the corner welded joints.