CONSTANT AND VARIABLE ASSUMING STRAIN RATE METHODS FOR IDENTIFICATION OF CONSTITUTIVE MODEL OF METALS USING HOPKINSON PRESSURE BAR TEST

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SHOKROLLAHI H.; SEDIGHI M.; KHANDAEI M.

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Journal: Modares Mechanical Engineering Year:2012 | Volume:12 | Issue:2 Page(s): 1-10

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Title

CONSTANT AND VARIABLE ASSUMING STRAIN RATE METHODS FOR IDENTIFICATION OF CONSTITUTIVE MODEL OF METALS USING HOPKINSON PRESSURE BAR TEST

Author(s)

SHOKROLLAHI H. | SEDIGHI M. | KHANDAEI M. | Issue Writer Certificate

Keywords

CONSTITUTIVE MODELQ2

HIGH STRAIN RATESQ2

SENSITIVITY ANALYSISQ1

Abstract

In the present paper, the parameters of Johnson-Cook (JC) CONSTITUTIVE MODEL for two steels have been identified, based on the Hopkinson pressure bar data found in the literature. Using the measured strain pulses, the experimental stress-strain and deformation-time curves can be extracted. The experimental data have been processed using two different methods. In the first method strain rate assume to be constant during deformation and in the other one the deformation has been applied to a modeled specimen. In each method, an optimal set of material constants for JC CONSTITUTIVE MODEL have been computed by minimizing the standard deviation of the numerically obtained stress-strain curve from the experimental data. Also a SENSITIVITY ANALYSIS has been performed on JC CONSTITUTIVE MODEL parameters and temperature changes during test have been investigated. The obtained results show that using constant strain rate method, leads to considerable error in results; for example in this study the minimum error is about 14%.

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APA: Copy

SHOKROLLAHI, H., SEDIGHI, M., & KHANDAEI, M.. (2012). CONSTANT AND VARIABLE ASSUMING STRAIN RATE METHODS FOR IDENTIFICATION OF CONSTITUTIVE MODEL OF METALS USING HOPKINSON PRESSURE BAR TEST. MODARES MECHANICAL ENGINEERING, 12(2), 1-10. SID. https://sid.ir/paper/177841/en

Vancouver: Copy

SHOKROLLAHI H., SEDIGHI M., KHANDAEI M.. CONSTANT AND VARIABLE ASSUMING STRAIN RATE METHODS FOR IDENTIFICATION OF CONSTITUTIVE MODEL OF METALS USING HOPKINSON PRESSURE BAR TEST. MODARES MECHANICAL ENGINEERING[Internet]. 2012;12(2):1-10. Available from: https://sid.ir/paper/177841/en

IEEE: Copy

H. SHOKROLLAHI, M. SEDIGHI, and M. KHANDAEI, “CONSTANT AND VARIABLE ASSUMING STRAIN RATE METHODS FOR IDENTIFICATION OF CONSTITUTIVE MODEL OF METALS USING HOPKINSON PRESSURE BAR TEST,” MODARES MECHANICAL ENGINEERING, vol. 12, no. 2, pp. 1–10, 2012, [Online]. Available: https://sid.ir/paper/177841/en

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