Journal
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
Volume 28, Issue 9, Pages 3561-3568Publisher
KOREAN SOC MECHANICAL ENGINEERS
DOI: 10.1007/s12206-014-0817-8
Keywords
Dynamic material properties; Johnson-Cook model; Strain rate effect form; SHPB test; High-strength steels
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Funding
- Defense Research Laboratory Program of the Defense Acquisition Program Administration
- Agency for Defense Development of the Republic of Korea [UD110089GD]
- National Research Foundation of Korea [22A20130000197] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this study, high strain rate conditions were obtained using a compressive split-Hopkinson pressure bar test apparatus that adopted a new data acquisition and processing scheme utilizing a LabVIEW system. Quasi-static strain rate conditions were obtained using a universal testing machine. The material responses of three high-strength steels under high strain rate and quasi-static conditions were investigated. They were characterized using the Johnson-Cook constitutive model. Two other optional strain rate forms were substituted for the constitutive model to predict material flow stress, especially at high strain rates exceeding 10(4) s(-1). The considered optional strain rate forms were the modified Johnson-Cook and Huh-Kang models, which both showed a non-linear relation between flow stress and logarithm strain rate. The material parameters in the constitutive equations of the three high-strength steels were evaluated by fitting and comparing the data over a wide range of strain rates.
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