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고온하 복수 표면균열의 성장 합체거동과 시뮬레이션에 관한 연구
서창민(C.M Suh),황남성(N.S Hwang),윤기봉(K.B Yoon) 한국해양공학회 1995 韓國海洋工學會誌 Vol.9 No.1
A simulation program concerned with multi-surface fatigue cracks which initiated at the semi-circular surface notches has been developed to predict their growth and coalescence behaviors at the elevated temperature. Three kinds of coalescence models such as SPC(surface point connection), ASME and BSI(British Standards Institution) conditions were applied, and the results of the simulation were compared with those of the experiment.<br/> This simulation is able to enhance the reliance and integrity of structures especially under the elevated temperature which have lots of difficulties in experiments and applications. This shows that the simulation result has utility for fatigue life prediction.<br/> Even though all the specimens were the same shape, the error rate was increased in accordance with the applied stress to the specimen. Among the material constants C and m in the narrow band, the results applied upper values of the band to the simulation has shown quite small error compared with the experiment results.
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高溫下 304 스테인리스鋼의 複數表面龜裂의 成長學動에 관한 實驗的 硏究
서창민(C. M. Suh),신형섭(H. S. Shin),황남성(N. S. Hwang),정대윤(D. Y. Jung) 한국해양공학회 1995 韓國海洋工學會誌 Vol.9 No.1
The crack which is discovered in various structures and machine elements is multi-cracks. Multi-cracks may cause serious problems because they grow individually, and coalesce into one and it leads to fracture.<br/> Fatigue tests have been carried out to study the growth and coalescence behavior of multi-surface-cracks initiated at the semicircular surface notch in type 304 stainless steel at elevated temperature.<br/> The results are as follows;<br/> When multi-surface-cracks are lying on the surface of material, the major surface crack has greater influence on the the fatigue life than the subcracks.<br/> The aspect ratio of multi-surface-cracks is lower than that of single crack because of the interaction and coalescence of surface cracks.<br/> Crack growth shape turns to semiellipse from the semicircle notch. After coalescence, the surface crack length increases rapidly, and it leads to fracture.<br/> Further, the slope transition of Paris law was found in the da/dN-ΔK₁ plots.
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