Effect of Loading Rate on Tensile Properties of Automotive Steel Sheet

Abstract:

Results of uni-axial tensile loading of three automotive steels at different strain rates (0.0011–3200s-1) are reported here. Quasi-static tensile tests were performed under the strain rate of 1.1×10-3 s-1 using an electromechanical universal testing machine, whereas dynamic tests were carried out under the strain rate in the range of 1100 to 3200 s-1 using a Split Hopkinson Tensile Bar apparatus. Based on the experimental results, the material parameters of widely used Johnson–Cook model which described the strain rate and temperature-dependent of mechanical behaviour were determined. The experiments show that strain-rate hardening is superior to thermal softening: yield stresses, tensile strength, deformation, and energy dissipation increase with the strain rate from quasi-static tests to dynamic tests. The Johnson–Cook model can describe the behaviour of these steels and provides the opportunity to study the material and structural response.

• Periodical: Advanced Materials Research (Volumes 690-693)
• Pages: 211-217
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.690-693.211
• Online since: May 2013
• Authors: Jin Gui Qin*, Fang Yun Lu, Yu Liang Lin, Xue Jun Wen
• Keywords: Automotive Steel, Constitutive Model, High Strain Rate, Hopkinson Bar

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