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http://dx.doi.org/10.5781/KWJS.2011.29.4.410

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

Ha, Yun-Sok (Welding Research Part, Samsung Heavy Industries CO., LTD.)
Publication Information
Journal of Welding and Joining / v.29, no.4, 2011 , pp. 48-53 More about this Journal
Abstract
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.
Keywords
Thermal distortion analysis; SDB Method; Stress-Strain curve; Elasto-Plastic; FEM;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 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
2 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
3 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
4 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)   과학기술학회마을   DOI
5 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
6 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   DOI