Mechanical characterization of multi phase steel at different rates of loading

Singh, Nilamber Kumar and Cadoni, Ezio and Singha, Maloy Kumar and Gupta, Narinder Kumar (2012) Mechanical characterization of multi phase steel at different rates of loading. Materials Science Forum, 710. pp. 421-426.

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Abstract

The purpose of the present paper is to investigate the mechanical properties of multi phase 800 high yield strength (MP800HY) steel under compressive loading at different strain rates (-4700s-1 to-0.001s-1). Specimens of MP800HY steel are tested on universal testing machine to study their stress-strain behavior under quasi-static (-0.001s-1) condition. Then, the specimens are tested under split Hopkinson pressure bar (SHPB) to study the strain rate sensitivity of the material under different rates of compressive loading (-4700s-1, -4300 1/s, -3800 1/s, -2900s-1 and-1600s-1). The effect of pulse shaper in SHPB experiments has been studied. Thereafter, the applicability of the existing Johnson-Cook material model to represent the flow stress of MP800HY is examined.

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