Resumen de Welding and Straightening Simulation of a Deckhouse Structure Using Linear Inherent Strain Method
Hector Ruiz, Naoki Osawa, Hidekazu Murakawa, Sherif Rashed
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.
