• Title/Summary/Keyword: 횡수축량

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Development of Formulas to Predict Deformations in Plate by Line Heating Method (선상가열법에 의한 강판의 변형 예측식 개발)

  • Lee, Joo-Sung;Lee, Joung-Ho
    • Journal of Ocean Engineering and Technology
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    • v.22 no.6
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    • pp.83-87
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    • 2008
  • Although a great deal of research has been carried out to solve the plate forming problem and to improve the effectiveness and productivity of the plate forming process, no practical way of automating the plate forming process has been proposed yet. Since characteristics of heating machines may vary, it is necessary to investigate the thermal deformation characteristics of the heating machine that will be used in the automation system its characteristics may be modified as new information about thermal deformation by heating becomes available. In this paper, experiments for line heating have been carried out to calculate the formula of predicting thermal deformation due to line heating with varying affecting parameters, and numerical study has been carried out to produce data beyond the range where a line heating test is impractical. Formulas of predicting transverse distortion and shrinkage have been proposed and derived, based on the present experimental and numerical works. This paper also illustrates how the formula has been modified as new experimental data are added.

On the Deformation Control of Ship's Thin Plate Block by Applying the Tensioning Method (장력법을 적용한 선체 박판블록의 변형감소 방안에 관한 실험연구)

  • Lee Joo-Sung;Kim Cheul-Ho
    • Journal of Ocean Engineering and Technology
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    • v.20 no.3 s.70
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    • pp.103-108
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    • 2006
  • It has been well appreciated that reducing weld-induced deformation as law as possible is important during fabrication for a more efficient production of blocks. The weld-induced deformation is more serious in thin plates than in thick plates because heat affect zone of thin plates is wider than that of thick plates and in addition internal and external constraints much more influence upon weld-induced deformation of thin plates. This paper deals with the application of the mechanical tensioning method to butt weld of thin plates to reduce the weld-induced deformation. In order to investigate the quantitative effect of tensioning method upon the reduction of angular deformation and shrinkage in longitudinal and transverse direction of weld line, butt welding test have been carried out for several thin plate specimens with varying plate thickness and magnitude of tensile load. From the present experimental study, it has been found that the tensioning method is very effective on reduction of weld-induced residual stress as well as weld-induced deformation.