KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)
- Volume 5 Issue 2
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- Pages.121-131
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- 1985
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- 1015-6348(pISSN)
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- 2799-9629(eISSN)
An Experimental Study on the Inner Crack Growth of Welded Connections of Steel Structures
강구조용접연결부(鋼構造鎔接連結部)의 내부구열성장(內部龜裂成長)에 관한 실험적(實驗的) 연구(硏究)
- Received : 1985.05.06
- Published : 1985.06.30
Abstract
The characteristic of fatigue crack growth in the homogeneous or the soft welded connections used SWS-53 steel and HT-80 steel as base metals is examined by fractographic analysis. As a result of this analysis, the fact that the characteristic of fatigue crack growth which is observed and measured at the surface has wide application to engineering practice is verified. Also, the fact that the welded parts of HT-80 steel have much danger of brittle fracture is prooved. Considering that the striations are observed at the welded parts of SWS-58 steel and the spacing of striations has higher numerical value than da/dN, we can prove that inner fatigue crack growth may develop in zig-zag directions.
SWS-58 강재(鋼材)와 HT-80 강재(鋼材)를 모재(母材)로 한 등질(等質) 또는 연질용접연결(軟質鎔接連結)의 피로구열성특성(疲勞龜裂成特性)을 파면해석(破面解析)을 통(通)하여 검토(檢討)하여 표면(表面)에서 관측(觀測), 측정(測定)하는 피로구열성특성(疲勞龜裂成特性)의 공학적(工學的)인 응용성(應用性)이 높은 것을 탐지하였다. 또한 HT-80 강재(鋼材)의 용접부(鎔接部)는 포성파괴(胞性破壞)의 위험성(危險性)이 높은 것을 밝혔다. SWS-58 강재(鋼材)의 용접부(鎔接部)에는 줄무늬 모양이 발견되며, 줄무늬 간격은 da/dN 보다 높은 값을 표시(表示)하는데 이것으로 내부피로구열(內部疲勞龜裂)이 지그재그 방향(方向)으로 성장(成長)하는 것을 알 수가 있었다.
Keywords