Uniaxial Tensile and Simple Shear Behavior of Resistance Spot-Welded Dual-Phase Steel Joints |
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Authors: | Hong Tao Wei Tong Jr" target="_blank">Louis G HectorJr Pablo D Zavattieri |
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Affiliation: | (1) Department of Mechanical Engineering, Yale University, New Haven, CT 06520, USA;(2) Department of Mechanical Engineering, Southern Methodist University, Dallas, TX 75275, USA;(3) General Motors R&D Center, Warren, MI 48090-9055, USA |
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Abstract: | Small test coupons were machined from single spot welds in a dual-phase steel (DP600) to investigate deformation and failure
of weld joints in both tension and shear. Quasi-static () testing was conducted in a miniature tensile stage with a custom image acquisition system. Strain accumulation in each weld
was analyzed where fracture occurred, which was typically outside the fusion zone. A few shear test coupons that failed in
the fusion zone were found to have the same spheroidal defects noted in previous work, and thus, severely limited weld strength
and ductility. A novel strain mapping method based upon digital image correlation was employed to generate two-dimensional
deformation maps, from which local stress-strain curves to failure were computed. As an important first step toward incorporation
of material models into weld simulations, a preliminary finite element analysis of a tension test successfully reproduced
the experimental results with material models for the base, heat-affected, and fusion zone materials generated from prior
work. |
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Keywords: | automotive carbon/alloy steels failure analysis mechanical testing welding |
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