4.4 Article

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

Journal

JOURNAL OF ENGINEERING MECHANICS
Volume 139, Issue 9, Pages 1197-1206

Publisher

ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)EM.1943-7889.0000557

Keywords

Mild steel; Hopkinson bar; Strain rate sensitivity; Fractography; Material models

Funding

  1. Indo-Swiss Joint Research Program
  2. Department of Science and Technology of India
  3. Swiss State Secretariat of Education and Research of Switzerland

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The purpose of the present paper is to investigate the mechanical behavior of mild steel at quasi-static (0.001s-1) and different rates of dynamic tensile (5-750s-1) and compressive (125-2,350s-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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