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Dynamic Tensile and Compressive Behaviors of Mild Steel at Wide Range of Strain Rates

Singh, N. K. / Cadoni, E. / Singha, M. K. / Gupta, N. K.

Abstract

The purpose of the present paper is to investigate the mechanical behavior of mild steel at quasi-static ( $0.001 s^{- 1}$ ) and different rates of dynamic tensile ( $5 - 750 s^{- 1}$ ) and compressive ( $125 - 2,350 s^{- 1}$ ) strain rates. Quasi-static experiments are conducted on a universal testing machine to study the stress-strain behavior of mild steel. A hydropneumatic machine and a modified Hopkinson bar are used to investigate the dynamic tensile behavior of mild steel specimens at medium and high strain rates, respectively, whereas the specimens are tested on a split Hopkinson pressure bar to acquire understanding of the strain rate sensitivity of mild steel under dynamic compression. The effects of a pulse shaper and gauge length of the specimen in the dynamic compression tests are investigated. High-speed photography has been used to monitor the deformation of the specimen at high strain rate experiments. The applicability of the existing Cowper-Symonds and Johnson-Cook material models to represent the mechanical behavior of mild steel in a plastic zone is examined. Finally, the fractographs of the tested tensile specimens are studied using a scanning electron microscope.

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Dynamic Tensile and Compressive Behaviors of Mild Steel at Wide Range of Strain Rates

Singh, N. K. / Cadoni, E. / Singha, M. K. / Gupta, N. K.

Abstract

The purpose of the present paper is to investigate the mechanical behavior of mild steel at quasi-static ( $0.001 s^{- 1}$ ) and different rates of dynamic tensile ( $5 - 750 s^{- 1}$ ) and compressive ( $125 - 2,350 s^{- 1}$ ) strain rates. Quasi-static experiments are conducted on a universal testing machine to study the stress-strain behavior of mild steel. A hydropneumatic machine and a modified Hopkinson bar are used to investigate the dynamic tensile behavior of mild steel specimens at medium and high strain rates, respectively, whereas the specimens are tested on a split Hopkinson pressure bar to acquire understanding of the strain rate sensitivity of mild steel under dynamic compression. The effects of a pulse shaper and gauge length of the specimen in the dynamic compression tests are investigated. High-speed photography has been used to monitor the deformation of the specimen at high strain rate experiments. The applicability of the existing Cowper-Symonds and Johnson-Cook material models to represent the mechanical behavior of mild steel in a plastic zone is examined. Finally, the fractographs of the tested tensile specimens are studied using a scanning electron microscope.

Dynamic Tensile and Compressive Behaviors of Mild Steel at Wide Range of Strain Rates

Singh, N. K. / Cadoni, E. / Singha, M. K. / Gupta, N. K.

Abstract

The purpose of the present paper is to investigate the mechanical behavior of mild steel at quasi-static ( $0.001 s^{- 1}$ ) and different rates of dynamic tensile ( $5 - 750 s^{- 1}$ ) and compressive ( $125 - 2,350 s^{- 1}$ ) strain rates. Quasi-static experiments are conducted on a universal testing machine to study the stress-strain behavior of mild steel. A hydropneumatic machine and a modified Hopkinson bar are used to investigate the dynamic tensile behavior of mild steel specimens at medium and high strain rates, respectively, whereas the specimens are tested on a split Hopkinson pressure bar to acquire understanding of the strain rate sensitivity of mild steel under dynamic compression. The effects of a pulse shaper and gauge length of the specimen in the dynamic compression tests are investigated. High-speed photography has been used to monitor the deformation of the specimen at high strain rate experiments. The applicability of the existing Cowper-Symonds and Johnson-Cook material models to represent the mechanical behavior of mild steel in a plastic zone is examined. Finally, the fractographs of the tested tensile specimens are studied using a scanning electron microscope.

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Title:

Dynamic Tensile and Compressive Behaviors of Mild Steel at Wide Range of Strain Rates

Contributors:

Singh, N. K. (author) / Cadoni, E. (author) / Singha, M. K. (author) / Gupta, N. K. (author)

Published in:

Journal of Engineering Mechanics ; 139 ; 1197-1206

Publication date:

2013-08-15

Size:

102013-01-01 pages

ISSN:

0733-9399 , 1943-7889

DOI:

https://doi.org/10.1061/(ASCE)EM.1943-7889.0000557

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

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