Welding deformation analysis based on improved equivalent strain method considering the effect of temperature gradients
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초록
In the present study, the existing equivalent stain method is improved to make up for its weaknesses. The improved inherent strain model is built considering more sophisticated three dimensional constraints which are embodied by six cubic elements attached on three sides of a core cubic element. From a few case studies, it is found that the inherent strain is mainly affected by the changes in restraints induced by changes of temperature-dependent material properties of the restraining elements. On the other hand, the degree of restraints is identified to be little influential to the inherent strain. Thus, the effect of temperature gradients over plate thickness and plate transverse direction normal to welding is reflected in the calculation of the inherent strain chart. The welding deformation can be calculated by an elastic FE analysis using the inherent strain values taken from the inherent strain chart.
Abstract
In the present study, the existing equivalent stain method is improved to make up for its weaknesses. The improved inherent strain model is built considering more sophisticated three dimensional constraints which are embodied by six cubic elements attached on three sides of a core cubic element. From a few case studies, it is found that the inherent strain is mainly affected by the changes in restraints induced by changes of temperature-dependent material properties of the restraining elements. On the other hand, the degree of restraints is identified to be little influential to the inherent strain. Thus, the effect of temperature gradients over plate thickness and plate transverse direction normal to welding is reflected in the calculation of the inherent strain chart. The welding deformation can be calculated by an elastic FE analysis using the inherent strain values taken from the inherent strain chart.
참고문헌 (10)
- Yun Sok Ha, "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), pp.56~62 (2007), 한국정밀공학회
- 하윤석, "Thermal distortion analysis method for TMCP steel structures using shell element", International Journal of Naval Architecture and Ocean Engineering, 1(2), pp.95~100 (2009), 대한조선학회
- Jang, C. D., "Welding distortion analysis of hull blocks using equivalent load method based on inherent strain", SSC-453 (2007)
- Jang, C. D., "A Study on the prediction of deformations of plates due to line heating using a simplified thermal elasto-plastic analysis", Journal of the Society of Naval Architects of Korea, 34(3), pp.104~112 (1997)
- Kim, S. I., "Development of Simple Prediction Method for Welding Distortion in Fillet Joints", Proceedings of the Annual Spring Meeting, Society of Naval Architecture of Korea, Geoje, Korea, pp.265~270 (1996)
- Kim, Y. T., "Structural analysis of ship hull block considering welding residual stress using equivalent strain method based on inherent strain", 박사, pp.2010
- Lee, C. H., "Prediction of welding deformation of ship full panel blocks using equivalent loading method based on inherent strain", 박사, pp.2002
- Lee, J. H., "Relations between input parameters and residual deformations in line heating process using finite element method and multi-variate analysis", 박사, pp.1999
- Murakawa, H., "Prediction of welding deformation and residual stress by elastic FEM based on inherent strain", Journal of the Society of Naval Architects of Japan, 180, pp.739~751 (1996)
- Satoh, K., "Effect of welding conditions on welding deformations in welded structural materials", Journal of the Japanese Welding Society, 45(4), pp.54~60 (1976)