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- 저자 : 李龍福 (검색결과 1 건)
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朴庚銀,鄭鎭成,李龍福 弘益大學校 科學技術硏究所 1995 科學技術硏究論文集 Vol.6 No.-
In this study, to evaluate the fatigue life of surface crack in welding material general structural rolled steel(SS400) was used and welding was performed by MIG butt process. After that, it was machined the same pattern`s initial surface flaw on each welding zone divided by welding metal zone(WM), heat affected zone(HAZ), base metal zone(BM) and boundaries. Using this specimen it could be well evaluated the fatigue life in welding zone. The result are summarized as follows: 1. In each welding zone surface fatigue crack varies from initial aspect ratio of two to semicircle shape at first, after that the aspect ratio of it is reduced gradually. Aspect ratio indicates largely in order of the boundary of HAZ and BM, BM and HAZ, the boundary of WM and HAZ and WM. 2. Surface fatigue crack growth rate is larger in surface direction compare with depth direction at first and it shows that approaches in two direction during fatigue crack propagate continuously. Fatigue crack growth rate indicates largely in order of the boundary of HAZ and BM, BM and HAZ, the boundary of WM and HAZ, and WM. 3. Fatigue life indicates largely in order of WM, the boundary of WM and HAZ, HAZ, BM and the boundary of HAZ and BM. 4. The ratio of initial life to fatigue life indicates largely in order of HAZ, the boundary of HAZ and BM, BM, the boundary of WM and HAZ, and WM. It belongs to 34% to 58% in welding zone.
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