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Advanced Technologies for Spot Weld Fracture Prediction in Automotive Steel Sheets

In the crash test of automobile bodies, when spot weld fracture and material fracture occur, the intended energy absorption may not be obtained due to the change of the deformation mode. Therefore, it is required to predict fracture of the spot weld using FEM analysis and take countermeasures in advance. We developed the software that enables us to predict fracture of the spot welded part in conjunction with a general-purpose crash analysis solver. The feature of this software is the prediction of fracture considering the width at which spot weld is subject to load. In addition, we introduced new functions developed to improve pre-