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대형 용접구조물의 탄소성 열변형 해석을 위한 용접부의 변형률 경계조건에 관한 연구

A Study on Weldment Boundary Condition for Elasto-Plastic Thermal Distortion Analysis of Large Welded Structures

  • 하윤석 (삼성중공업 산업기술연구소 용접연구파트)
  • Ha, Yun-Sok (Welding Research Part, Samsung Heavy Industries CO., LTD.)
  • 투고 : 2011.02.14
  • 심사 : 2011.08.18
  • 발행 : 2011.08.31

초록

A thermal distortion analysis which takes strains directly as boundary conditions removed barrier of analysis time for the evaluation of welding distortion in a large shell structure like ship block. If the FE analysis time is dramatically reduced, the structure modeling time or the input-value calculating time will become a new issue. On the contrary to this, if the calculation time of analysis input-value is dramatically reduced and its results also are more meaningful, a little longer analysis time could be affirmative. In this study, instead of using inherent strain based on elastic analysis, a thermal strain based on elasto-plastic analysis is used as the boundary condition of weldments in order to evaluate the welding distortion. Here, the thermal strain at the weldment was established by using a stress-strain curve established from the test results. It is possible to automatically recognize the modeling induced-stiffness in the shrinkage direction of welded or heated region. The validity of elasto-plastic thermal distortion analysis was verified through the experiment results with various welding sequence.

키워드

참고문헌

  1. Changdoo Jang, Seungil Seo and Daeeun Ko : A Study on the Prediction of Deformations of Plates Due to Line Heating Using a Simplified Thermal Elasto-Plastic Analysis, Journal of Ship research, 13-1 (1997), 22-27
  2. Yunsok Ha, Sihoon Cho and Taewon Jang : Development of Welding Distortion Analysis Method Using Residual Strain as Boundary Condition, Materials Science Forum, 580-582 (2008), 649-654 https://doi.org/10.4028/www.scientific.net/MSF.580-582.649
  3. Yunsok Ha and Changdoo Jang : An Improved Inherent Strain Analysis for Plate Bending by Line Heating Considering Phase Transformation of Steel, International Journal of Offshore and Polar Engineering, 17-2 (2007), 139-144
  4. Yunsok Ha, Changdoo Jang, Jongtae Kim and Hyungsuk Mun : Analysis of Post-Weld Deformation at the Heat-Affected Zone Using External Forces Based on the Inherent Strain, International Journal of Precision Engineering and Manufacturing, 8-4 (2007), 56-62
  5. Changdoo Jang, Changhyun Lee and Daeeun Ko : Prediction of Welding Deformations of Stiffened Panels, Journal of Engineering for Maritime Environment, 216-M (2002), 133-143
  6. Yunsok Ha, Jinhyuk Yang, Seokhee Won and Myungsu Yi : Development of Thermal Distortion Analysis Method Based on Inherent Strain for TMCP Steels, Journal of KWJS, 26-3 (2008), 61-66 (in Korean) https://doi.org/10.5781/KWJS.2008.26.3.061

피인용 문헌

  1. Thermal Distortion Analysis by Inconel Over-Lay At Circular Moonpool Structures vol.3, pp.2, 2013, https://doi.org/10.5574/IJOSE.2013.3.2.095
  2. Analytical Methodology Obtaining an Optimal Welding Sequence for Least Distortion of Welded Structure vol.31, pp.3, 2013, https://doi.org/10.5781/KWJS.2013.31.3.54
  3. A Mesh Generation Method to Estimate Welding Deformation for Shell Structures vol.21, pp.2, 2016, https://doi.org/10.7315/CADCAM.2016.143
  4. Three-Dimensional Thermo-Elastic-Plastic Finite Element Method Modeling for Predicting Weld-Induced Residual Stresses and Distortions in Steel Stiffened-Plate Structures vol.06, pp.01, 2018, https://doi.org/10.4236/wjet.2018.61010