Abstract
Welding is the most widely used assembly method available to industries in the construction of ships and offshore platforms. However, this method always produces a certain amount of distortion that will not only degrade the performance but also increase the building cost of the structure, and it should be straightened. Straightening is performed by mechanical or thermal techniques. The principal mechanical technique is pressing, but it is difficult to apply it to 3D structures such as a ship block. Therefore, mainly thermal techniques are adopted in shipyards. These techniques create irreversible strain (inherent strain) into the component. This is achieved by locally heating the material to a temperature where the heated material with lower yield stress expands against the surrounding cold, higher yield strength material, causing compressive plastic strain in the hot material. When the component is cooled, the heated area shrinks and inherent strain is generated. Spot, line, or wedge-shaped heating techniques are usually applied in thermal straightening. In this study, the modified JWRIAN code by Ruiz is used for performing a sequence of welding and straightening simulations of a deckhouse structure, with thin and opening plates.
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Acknowledgements
This study was performed as a joint research activity of the Global Collaborative Research Center for Computational Welding Science (CCWS) of Osaka University and the research committee on ship construction technology of the Japan Society of Naval Architects and Ocean Engineers (JASNAOE), financially supported by JASNAOE.
The authors would like to acknowledge Mr. Akira Inoue (Mitsubishi Heavy Industry), Mr. Yuji Inoue (Mitsui Shipbuilding and Engineering), Mr. Hiroshi Iwamura (Sumitomo Heavy Industry Marine Engineering), Mr. Eitaro Hara (Kawasaki Heavy Industry), and Mr. Kazuhiro Shimokawa and Mr. Kanaya (Japan Marine United) for their contribution in discussions and field tests.
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Hector, R., Osawa, N., Hidekazu, M., Sherif, R. (2019). Welding and Straightening Simulation of a Deckhouse Structure Using Linear Inherent Strain Method. In: Vega Sáenz, A., Pereira, N., Carral Couce, L., Fraguela Formoso, J. (eds) Proceedings of the 25th Pan-American Conference of Naval Engineering—COPINAVAL. COPINAVAL 2017. Springer, Cham. https://doi.org/10.1007/978-3-319-89812-4_5
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