Validation of the Tabulated Johnson-Cook Model for a Dynamic Compression Simulation

Guo Ju Li; Qun Bo Fan; Rui Hua Gao; Jin Tao Liu; Cheng Miao

doi:10.4028/www.scientific.net/AMM.782.245

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 782Validation of the Tabulated Johnson-Cook Model for...

Validation of the Tabulated Johnson-Cook Model for a Dynamic Compression Simulation

Abstract:

MAT224 is a tabulated version of the Johnson-Cook model in LS-DYNA. Compared with the original Johnson-Cook material, MAT224 was developed to simulate the dynamic response of a material by just defining the effective stress as a function of effective plastic strain at different strain rates and temperatures, thus avoiding the tedious parameter fitting procedures in the traditional Johnson-Cook model. However, the stability and precision of solution is strongly dependent on the effective stress versus effective strain curves in MAT224, and unreasonable curve data will lead to warnings or errors in the process of solution. In the current study, a two-dimensional axisymmetric finite element model for the Ti-6Al-4V titanium alloy under dynamic compression was built, and MAT224 was employed. By investigating the effects of the curve numbers, strain ranges, data points, as well as changing tendencies, on the simulation results, the stability and the reliability for MAT224 are systematically studied.

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Periodical:

Applied Mechanics and Materials (Volume 782)

Pages:

245-251

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.782.245

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Online since:

August 2015

Authors:

Guo Ju Li, Qun Bo Fan, Rui Hua Gao, Jin Tao Liu, Cheng Miao

Keywords:

Dynamic Compression, MAT224, Ti-6Al-4V Alloy

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References

[1] G.R. Johnson, W.H. Cook, Fracture characteristics of three metals subjected to various strains, strain rates, temperatures and pressures, Eng. Fract. Mech. 21 (1985) 31-48.

DOI: 10.1016/0013-7944(85)90052-9

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