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분기관 용접부의 크리프 특성 불균일이 응력 재분배에 미치는 영향
이국희(Kuk-Hee Lee),김윤재(Yun-Jae Kim),윤기봉(Kee-Bong Yoo),Kamran Nikbin,Dave Dean 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
This paper attempts to quantify the effect of mismatch in creep properties on steady-state stress distributions for a welded branch vessel. A particular geometry for the branch vessel is chosen. The vessel is modeled by only two materials, the base and weld metal. Idealized power law creep laws with the same creep exponents are assumed for base and weld metals. A mismatch factor is introduced, as a function of the creep constant and exponent. Steady-state stress distributions within the weld metal, resulting from threedimensional, elastic-creep finite element (FE) analyses, are then characterized by the mismatch factor. We can find that average stresses in the weld can be characterized by the mis-match factor. And there is an analogy between elastic-creep and elastic-perfectly plastic.