• 대한조선학회 특별논문집
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• 대한조선학회 2005년도 특별논문집
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• pp.211-215
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• 2005

The binary Al-Mg alloys are the basis for the 5000 series of non-heat-treatable aluminum alloys. In general, 5000 series of aluminum alleys have a high strength, good welding characteristics and a high resistance to corrosion, especially under the seawater. Thus the aluminum alloys are adopted in the hull material of hovercraft that is required light in weight as well as high strength. It is very important that the weldability problem of these alloys caused by high thermal conductivities welding deformation, porosity and so on. in this study, auto-welding equipment was applied for aluminum welding automation. Also, optimal welding data were studied by investigating welding characteristics for various shapes of weldment to use Al 5083 that is representative structural materials of the 5000 series of aluminum alloys.

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 2006년도 춘계 학술대회 개요집
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• pp.97-99
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• 2006

A ship owner has been disappointed with the wrinkle, phenomenon visually occurring at the side shell structure of VLCC(very large crude oil carrier). In order to solve this problem, we have firstly performed a variety of actual measurements. Furthermore, comparing the welding deformation level of DSME(Daewoo Shipbuilding & Marine Engineering Co. Ltd.) with that of SHI(Samsung Heavy Industries), the superiority of deformation control level of Korean shipyard has been substantiated.

• 한국분말야금학회:학술대회논문집
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• 한국분말야금학회 1998년도 춘계학술대회 및 발표대회 강연 및 발표논문 초록집
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• pp.30-31
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• 1998

• 한국분말야금학회:학술대회논문집
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• 한국분말야금학회 1998년도 추계학술대회 및 발표대회 강연 및 발표논문 초록집
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• pp.28-28
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• 1998

• 한국분말야금학회:학술대회논문집
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• 한국분말야금학회 1999년도 춘계학술대회 및 발표대회 강연 및 발표논문 초록집
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• pp.39-39
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• 1999

• 한국CDE학회논문집
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• 제21권2호
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• pp.143-150
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• 2016

In shipbuilding, hull assemblies are manufactured by welding. The thermal deformation caused by the welding produces shape deformation. Counter-deformed design methods have been used in shipyards to cope with the weld-induced deformation of ship assembles. Finite element methods (FEMs) are frequently used to estimate welding distortion in the counter-deformed design. For the estimation of welding distortion, producing uniform rectangular elements is required to enter thermal loads on the welding line and obtain accurate analysis results. In this paper, a new automatic mesh generation method is proposed for prediction of welding deformation in FEM. Meshes are constructed for test cases to demonstrate the feasibility of the proposed mesh generation method.

• 동력기계공학회지
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• 제16권3호
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• pp.51-56
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• 2012

The effect of deformation induced martensite transformation on the mechanical properties in austenitic stainless steel with high Mn was studied. ${\alpha}$'-martensite was formed by deformation in austenitic stainless steel with high Mn. Deformation induced ${\alpha}$'-martensite was formed with surface relief by cold rolling. With the increase of deformation degree, volume fraction of deformation induced martensite was increased rapidly in early stage of deformation and then, increased slowly. With the increase of deformation degree, hardness and tensile strength were rapidly increased with linear relations, while elongation was rapidly decreased and then slowly decreased. Hardness, tensile strengths and elongation were influenced strongly by deformation induced martensite.

• Journal of Ship and Ocean Technology
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• 제7권4호
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• pp.41-49
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• 2003

Welding deformation reduces the accuracy of ship hull blocks and decreases productivity due to the need for correction work. Preparing an error-minimizing guide at the design stage will lead to higher quality as well as higher productivity. Therefore, developing a precise method to predict the weld deformation is an essential part of it. This paper proposes an efficient method for predicting the weld deformation of complicated structures based on the inherent strain theory combined with the finite element method. A simulation of a stiffened panel confirmed the applicability of this method to simple ship hull blocks.

• Journal of Welding and Joining
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• 제25권2호
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• pp.70-75
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• 2007

Simplified mathematical formulas are presented to predict deformations during the plate forming process when the heating parameters are given. To obtain the formulas, firstly, the thermal analysis for steel plate is performed, and the thermo-mechanical analysis is followed with actual heating conditions. The analyses have been carried out by the commercial software MARC, which is programmed based on the FEM. Secondary, the results of the mechanical analysis are synthesized with their variables for a statistical approach, which results in simplified formulas. The results of the analysis are well compared with those of experimental measurements.

• 한국산학기술학회논문지
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• 제11권8호
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• pp.2727-2733
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• 2010

본 연구에서는 비닐하우스 기존모델과 이번에 개발한 모델의 모델링 하였으며, 해석은 폭설이 250mm 왔을 때 쌓인 눈의 하중에 의하여 비닐하우스가 어떠한 변형을 하는 지를 구조해석을 통하여 비교하는 것이 주된 목적이다. 기존의 비닐하우스와 개발한 비닐하우스의 구조에 있어서 개발 모델을 적용함으로서 기존 모델보다 비용이 덜 들고 최대 50% 이상의 변형량을 줄일 수 있어 안정성이 좋고, 그 제작비용도 절감할 수 있다.