Ductile Fracture from Spot Weld and Flange Edge in Advanced High Strength Steels

Paper #:
  • 2017-01-0365

Published:
  • 2017-03-28
Abstract:
A simple testing method is proposed in order to investigate the ductile fracture in crashed automotive components using advanced and ultra-high strength steels. The fracture is often prone to occur at spot-weld joint and sheet edge. It is well known that the heat affected zone is weak point in ultra-high strength steel due to the annealed material around the nugget, and sheet edge is low ductility due to the damage of shearing. The proposed method is designed to simulate the ductile fracture started from spot weld point and sheared edge in deformed automotive components in crash event. Automotive steel sheets with a wide range of tensile strengths from 270 MPa to 1470 MPa, shown in Table 1, were examined to investigate the effect of material strength on the fracture behavior. Effect of cutting method including machining and laser cutting also investigated. The experimental results indicate that controlling the stress and strain localization is important for prevent the fracture in ultra-high strength steels. Based on the experimental results, FE simulated is carried out taking consideration of the heat-affected material in spot weld and damaged shared edge. The modeling of failure criteria is discussed to improve the accuracy of the simulation. The FE simulation shows good agreement with experimental results. The study of numerical modeling promises the improvement of crash simulation for the full size vehicle.
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