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윤종헌(Jong Hun Yoon),이정환(Jung Hwan Lee) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.9
수송기기의 연비향상과 에너지 절감을 위하여 자동차 업계를 비롯한 각종 산업 전반에 마그네슘 합금의 적용이 확대되고 있는 추세이다. 조밀육방 격자 구조(HCP)를 갖는 마그네슘 합금의 경우, 낮은 성형성과 강한 소성 비대칭성 및 소성 이방성으로 인하여 실제 부품의 적용에 많은 제약조건이 수반되고 있다. 본 논문에서는 CPB06 항복함수를 이용하여 AZ31 의 인장-압축 비대칭성을 모델링하고 이를 이용하여 AZ31 튜브의 압괴해석을 수행하고자 하였다. With the increasing demand for lightweight materials to reduce fuel consumption, especially in the transportation industry, magnesium alloys are being widely studied. However, there are several limitations to the largescale application of magnesium alloys in a structure because of their low formability and strong anisotropy. In order to take into account both the strong anisotropy and tension-compression asymmetry of AZ31 sheet alloy, the Cazacu-Plunkett-Barlat yield criterion (Cazacu, 2006) was adopted in material modeling. The variation of the anisotropic coefficients that describe the yield surface evolution of AZ31 is optimized using an interpolation function based on specific calibration results. It generates continuous yield surfaces, which makes it possible to describe different hardening rates in tension and compression as well as the tension-compression asymmetry of magnesium alloys. The performance of the CPB06 yield criterion for simulating an axial crushing test was tested and compared with that of the Hill (1948) yield criterion.
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알루미늄 후판을 이용한 Moss spherical 타입의 LNG 탱크 곡면 성형
전효원(Hyo-won Jeon),윤종헌(Jong-Hun Yoon),이정환(Jeong-Hwan Lee),김세종(Se-Jong Kim) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.5-3
One of the main streams of LNG tanker building is the Moss spherical tank design since it can be precisely analyzed on reliability and safety of construction by stress analysis. As the materials for the Moss spherical tank, aluminum alloy 5083 is generally applied to the wall of LNG tanker building, which are free of low temperature brittleness, corrosion resistance, weldability, and excellent material properties in usage. The Moss spherical tank is constructed with several patches of A5083 thick plate with curved surface by welding together. It is essential to predict the amount of springback for deformed thick plates in design of reliable construction because they should be assembled exactly into the perfect sphere. Unless it is constructed based on the initial design, there are additional processes for fixing those together and LNG tanker has to pay the penality to a consumer. In this paper, FE analyses are conducted for predicting the amount of springback according to the various forming conditions and forming processes. Newly proposed forming process is evaluated by how reducing the springback compared with conventional forming process for curved surface of Al thick plate.
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