Calibration and Verification of Dynamic Mechanical Properties of High-strength Armored Steel Based on Johnson-Cook ConstitutiveModel

doi:10.12382/bgxb.2021.0409

Abstract

Abstract: A specific type of armored steel with high yield strength has been widely used in China to improve the protection performance of armored vehicles. To numerically simulate the dynamic properties of the material，the material’s dynamic constitutive parameters based on the Johnson-Cook constitutive model are calibrated and verified through experiments. First，quasi-static mechanical properties of the armor steel are systematically measured using a universal material testing machine under temperatures ranging from room temperature to 550 ℃.The compression properties of the material are further measured at various strain rates using a separated Hopkinson pressure bar system. Second，based on the Johnson-Cook constitutive model，the measured dynamic properties of the armor steel are fitted to obtain the material’s constitutive parameters. Finally，a monolithic beam made of the armor steel is impacted by a aluminum foam projectile launched from a light-gas gun，and the test results are compared with finite element simulation results obtained using the constitutive parameters and the ideal elastic-plastic constitutive model. The results show that the armor steel demonstrates strong strain rate strengthening effect and thermal softening effect. The relative error between the peak deflection values of the monolithic beam obtained from J-C constitutive model simulation and experimental study is 1.7%-6.1%，and that for residual deflection is 0.6%-7.6%.

Key words: high-strengtharmorsteel, Johnson-Cookconstitutivemodel, dynamicmechanicalproperties, aluminumfoamprojectile, impacttest

CLC Number:

O347.3

ZHANG Dujiang， ZHAO Zhenyu， HE Liang， REN Jianwei， QIANG Lusheng， ZHOU Yilai. Calibration and Verification of Dynamic Mechanical Properties of High-strength Armored Steel Based on Johnson-Cook ConstitutiveModel[J]. Acta Armamentarii, 2022, 43(8): 1966-1976.

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