Ti 용접재의 잔류응력에 의한 피로크랙 진전거동에 관한 연구

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The purpose of this thesis was to investigate the welding characteristics and the fatigue crack propagation behavior according to the residual stress of titanium, commonly using power station, aircraft and ship.
The experimented material was TIG welded in order to look over the characteristics according to the notch position and compare with other materials.
We compared and reviewed the fatigue crack propagation behavior of nonwelded base metal and welded specimens having different notch position to evaluate the fatigue crack propagation behavior by welding condition.
The summerized results are as fallows;
1. As the result of specimens data, specimen2 Crack Behavior rate was lower 30 times than base metal, and so total fracture life was very influenced by it.
2. The fatigue life was shown higher as following the order, boundary zone> HAZ >Welding Zone > Base metal. Especially the fatigue life of boundary zone notched specimen was shown 700% higher than that of base metal.
3. The initial fatigue crack propagation rate is slower in this order, Boundary zone < Welding zone < HAZ < Base metal.
4. Notch tip of specimen2 was offsetted 6.7mm from boundary HAZ and it formed 25percent in total fracture length.
Alternative Title
A Study on the Fatigue Crack Propagation Behavior according to theResidual Stress of Ti Welding Material
Alternative Author(s)
Heo, Se-Heon
조선대학교 교육대학원
교육대학원 기술.가정교육
Awarded Date
2006. 2
Table Of Contents
Nomenclatures = Ⅲ
List of Figures = Ⅳ
List of Table = Ⅵ
List of Photographs = Ⅶ
제1장 서론 = 1
1.1 연구배경 = 1
1.2 연구목적 = 5
제2장 이론적 배경 = 7
2.1 티타늄의 용접 = 7
2.2 단면법에 의한 용접부의 잔류응력 측정 = 13
2.3 피로크랙 발생 및 전파거동 = 23
제3장 실험 = 25
3.1 시험편 = 25
3.2 실험방법 = 40
제4장 실험결과 및 고찰 = 44
4.1 용접잔류응력 분포의 형태 = 44
4.2 피로크랙길이와 하중 반복수와의 관계 = 51
4.3 피로크랙전파속도와 크랙길이와의 관계 = 54
4.4 피로크랙전파속도와 응력확대계수와의 관계 = 62
제5장 결론 = 66
참고문헌 = 67
조선대학교 교육대학원
허세헌. (2006). Ti 용접재의 잔류응력에 의한 피로크랙 진전거동에 관한 연구
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Education > Theses(Master)(교육대학원)
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