Identification of High-Strain-Rate Material Parameters in Dynamic Johnson-Cook Constitutive Model

LIU Ai-qun; HUANG Xi-cheng

doi:10.3879/j.issn.1000-0887.2014.02.010

Volume 35 Issue 2

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LIU Ai-qun, HUANG Xi-cheng. Identification of High-Strain-Rate Material Parameters in Dynamic Johnson-Cook Constitutive Model[J]. Applied Mathematics and Mechanics, 2014, 35(2): 219-225. doi: 10.3879/j.issn.1000-0887.2014.02.010

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Identification of High-Strain-Rate Material Parameters in Dynamic Johnson-Cook Constitutive Model

doi: 10.3879/j.issn.1000-0887.2014.02.010

LIU Ai-qun¹,
HUANG Xi-cheng²

¹The Department of Civil Engineering, Ludong University, Yantai, Shandong 264025, P.R.China;²Institute of Structural Mechanics, China Academy of Engineering Physics,Mianyang, Sichuan 621900, P.R.China

Received Date: 2013-04-23
Rev Recd Date: 2013-12-09
Publish Date: 2014-02-15

Abstract

Abstract

The dynamic Johnson-Cook constitutive model is widely used in numerical simulation of materials under dynamic loading. This model is very important in impact dynamics. The method of determining the parameters of heat softening and strain-strengthening in the Johnson- Cook model was proposed based on the strain-hardening parameters obtained from the material experiments including quasi-static uniaxial tension and uniaxial torsion. The material parameters were identified with the optimization algorithm, in which the parameter space was solved through iteration and the optimal point was found to minimize the difference between the model prediction and the experimental data. In the adiabatic heating case, the determination method of the Johnson-Cook model parameter m was demonstrated.
- Johnson-Cook constitutive model,
- dynamic mechanical property,
- flow stress,
- high strain rate,
- parameter identification

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References(10)

References

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