To prevent problems caused by welding deformation, preparation in the design stage is necessary. Countermeasures in the design stage are also the most cost-effective method. In this study, to give designers information on the welding deformations, a system to calculate and visualize the welding deformations is developed. The model to visualize the deformation is the stiffened plate common in the ship structure. To increase computational efficiency, theoretical solutions to calculate the deformations of plate and stiffener are used instead of numerical analysis. Also, to ensure accuracy, experiments to estimate bending moments causing the welding deformations are performed. A computer program written with Visual C++ is developed for interactive data input, calculation of welding deformations, and display of deformed shape. Designers can change the design in the early stage after checking the deformed shape with this system.
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