Numerical simulation on the anti-penetration mechanisms of hexagonal steel-tube-confined concrete targets

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (18) : 126-131.

MENG Chaomei1,2, LIU fei1, JIANG Zhigang1, SONG Dianyi1, TAN Qinghua1

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Abstract

Steel-tube-confined concrete (STCC) targets have superior anti-penetration performance over ordinary unconfined concrete targets.The penetration progress and confined mechanisms of hexagonal and circular STCC targets were analyzed by using the finite element-smoothed particle hydrodynamics method in the finite element package ANSYS/LS-DYNA to reveal the influence of steel-tube shape on penetration mechanisms.The results show that the steel-tube confinement effect consists of the stress wave effect and predominate displacement constraint effect on concrete during the cavity expansion progress.The profile of steel tube has influence on the distribution of stress and displacement of the steel tube.The stress distribution along the circumference of circular STCC targets is nearly uniform and the steel tube is in simple tensile state under radially uniform pressure for the case of normal penetration without any eccentricity, while there are in-plane tensile deformation and out-plane bending deformation for polygonal steel tubes under non-uniform inner pressure.Furthermore, the corners of hexagonal steel tubes expand little due to the bending displacement, which enhances the confinement to concrete and develops high-compressive regions near the diagonal in polygonal STCC targets.Thus, the penetration resistance is increased and the anti-penetration performance is improved.

Key words

Protective structure / Confined concrete / Penetration mechanism / Numerical simulation

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MENG Chaomei1,2, LIU fei1, JIANG Zhigang1, SONG Dianyi1, TAN Qinghua1. Numerical simulation on the anti-penetration mechanisms of hexagonal steel-tube-confined concrete targets[J]. Journal of Vibration and Shock, 2018, 37(18): 126-131

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