Patent ID: 7672819
Filing Date: 2010-03-02
Classification: B23K,G01N,G06F

Abstract:
1. A spot weld fracture analysis method implemented by a fracture analysis apparatus for a spot weld portion of three or more mutually superimposed plates that are spot-welded at a common welding point, comprising: modeling an upper plate, a lower plate, and every plate disposed therebetween by shell elements; executing an analysis under a predetermined input load condition by using a finite element model in which shell elements corresponding to a spot weld point position of each plate of the three or more plates are individually interconnected via beam elements; finding, using the fracture analysis apparatus, an element force of a beam element that acts on a shell element relevant to every plate disposed between the upper plate and the lower plate from a difference between the element forces of two beam elements that are connected to the shell element relevant to every plate disposed between the upper plate and the lower plate on a basis of an analysis result obtained via the analysis; and predicting a possibility of fracture of a spot weld between at least one plate disposed between the upper plate and the lower plate and an adjacent plate based on the element force found.