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PUKYONG Repository 산업대학원 토목공학과

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Alternative Title: Effect of Blast Surface Treatment on Fatigue Behavior of Out-of-Plane Gusset Welded Joints

Abstract: Blast method has been applied in newly-built steel structures for cleaning forged surface and increasing adhesive property of applied painting systems. However, the effect of the blast surface preparations on fatigue behavior of welded joints is not clarified.
In this paper, fatgiue tests were carried out on out-of-plane gusset welded joints and the effect of the blast surface preparation on the fatigue strength was studied.
The radius of curvature at weld toe of surface treatment specimens by using the blast method is larger than that of as-welded specimens.
The experiment results have been found that the fatigue life of the surface-treated specimens is longer than that of as-welded specimens, even though the fatigue life of surface-treated specimens and that of as-welded specimens are not clearly different in the range of high stress. Over 150% increase in fatigue limit could be realized by using blast method.

URI: https://repository.pknu.ac.kr:8443/handle/2021.oak/4098
http://pknu.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000001984256

Table Of Contents: 1. 서론 = 1
2. 피로파괴 = 4
2.1 피로파괴의 기초 = 4
2.1.1 반복하중과 수명 = 4
2.1.2 피로수명 = 6
2.1.3 S-N선도 = 7
2.1.4 피로파괴의 파면 특징 = 8
2.2 피로강도의 제 인자 = 9
2.2.1 응력비가 피로강도에 미치는 영향 = 9
2.2.2 용접잔류응력이 피로강도에 미치는 영향 = 10
2.3 용접연결부의 피로설계기준 = 15
2.3.1 도로교설계기준의 피로설계기준 = 15
2.3.2 각국의 피로설계기준 = 17
2.4 쇼트피닝 가공 = 19
2.4.1 쇼트피닝의 기본 개념 = 19
2.4.2 쇼트피닝 가공의 장점 = 21
3. 피로시험 = 23
3.1 시험체 제작 = 23
3.2 시험방법 = 26
3.3 용접토우부 비드형상 및 잔류응력 측정 = 29
3.3.1 용접토우부 비드형상 측정 = 29
3.3.2 잔류응력 측정 = 32
4. 피로시험 결과 = 37
4.1 피로균열 진전 = 37
4.2 피로수명 = 40
5. 결론 = 43
참고문헌 = 44
감사의 글 = 47

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