Characteristics of Constitutive Equations under Rod Impact Analysis by Smoothed Particle Hydrodynamics

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Journal of the Korea Institute of Military Science and Technology 2003;6(3):62-73.

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SPH를 이용한 봉충돌 해석에서 구성방정식의 특성

김용환, 김용석, 이정민

¹충남대학교 기계설계공학과
²국방과학연구소
³㈜풍산 안강공장

Abstract

The characteristics of constitutive equations, for hydrocodes, were Investigated by the comparison between the smoothed particle hydrodynamcis simulation and the experiment of rod impact test which resulted in a deformation history of impacting front where high strain and high strain rate dominate. The constitutive equations used in the simulation Is J-C(Johnson-Cook) model, Z-A(Zerilli-Armstrong) model, and S-C-G(Steinberg-Cochran-Guinan) model. The modification of Z-A model, based on the increased effect of strain-rate hardening, showed better correlation with expriment.

Key Words: Constitutive Equation, High-strain, High-strain-rate, Rod Impact Test, Hydrocode, Smoothed Particle Hydrodynamics