통합 검색 | Korea Science

최동준;오정택;정재현;조종래
- Journal of Advanced Marine Engineering and Technology
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- 제32권1호
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- pp.131-136
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- 2008
The double-walled steel vessel with powder insulation in the space between the walls is used to minimize heat transfer by radiation and conduction in cryogenic storage tank. The vacuum required the insulation is much less extreme than with high-vacuum or multilayer insulations. The solid supports are used to bear the weight of the inner container. Thermal and structural analysis of the tank have been carried out to study the effect of vacuum and weldment geometry of the internal supports. Heat flux in wall is increased with increasing of thermal conductivity of perlite. Heat flux and stress of support is not affected by weldment geometry.
https://doi.org/10.5916/jkosme.2008.32.1.131 인용 PDF KSCI

이용복
- 한국생산제조학회지
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- 제7권3호
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- pp.68-78
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- 1998
Welding structure contains residual stress due to thermal-plastic strain during welding process, and its magnitude and distribution depend on welding conditions. Cracks initiate from various defects of the weldment, propagate and lead to final fracture, The crack initiation and propagation processes are affected by the magnitude and distribution. Therefore, the magnitude and distribution of weldment residual stress should be considered for safety design and service of welding structures. Also it is very important that more accurate assessment method of fatigue crack growth must take into account the redistributing the residual stress quantitively. because the residual stress in weldment has characteristics of its redistribution with loading magnitude, number of cycles and fatigue crack propagation. In this study fatigue crack behavior of STS-304 weldment was investigated during crack propagation into tensile residual stress region or compressive residual stress region. Crack growth rates were predicted and compared with experimental results.
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장재일;양영철;김우식;이백우;권동일
- 한국가스학회지
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- 제3권2호
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- pp.1-10
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- 1999
각종 발전설비 및 LNG 저장탱크 등 대형산업구조물의 구조적 건전성을 확보하기 위해서는 강구조물을 형성하는 강용접부의 파괴인성 평가가 필수적이다. 강용접부는 모재와는 달리 다양한 재질적 불균질성을 가지는 경우가 대부분인데, 이러한 불균질성은 파괴변수 및 인성치에 대하여 역학적, 야금학적으로 많은 영향을 미치게 되므로 파괴인성 시험시에는 불균질 인자들의 영향을 반드시 고려해 주어야 한다. 하지만 국내의 경우는 강용접부의 불균질성에 대한 체계적인 연구가 이루어져 있지 않은 상태이므로, 본 논문에서는 강용접부가 가지는 인성적, 강도적 불균질에 대하여 정리하고 이에 따른 문제점을 리뷰하였다.
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김성우;배동호;조선영;김철한
- Journal of Welding and Joining
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- 제17권2호
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- pp.76-83
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- 1999
Fracture toughness({TEX}$J_{IC}${/TEX}) on 304 austenitic stainless steel weldments artificially degraded for long period under SCC environments were evaluated to investigate its reliability and environmental characteristics. Electro-chemical polarization tests were previously carried out to evaluate corrosion susceptiblility of weldment, and stress corrosion cracking was tested under various conditions of 3.5wt.% NaCl solution, the temperature of $25^{\circ}$C and $95^{\circ}$C, and oxygen concentration during 3000hours. From the results obtained, it was found that 304 stainless steel weldment was so susceptible under high temperature and high oxygen concentration of 3.5wt.% NaCl solution, and fracture toughness({TEX}$J_{IC}${/TEX}) was also considerably reduced by material degradation.
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