Effect of the sudden increase of strain rate on concrete dynamic tensile failure based on 3D meso-scale simulation

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (2) : 39-48.

JIN Liu，YU Wenxuan，DU Xiuli

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Abstract

In civil engineering, concrete structures often suffer from multiple dynamic loadings, or being subject to dynamic loadings with different strain rates on the base of initial loadings.In the study, a three-dimensional meso-scale numerical model of dumbbell-shaped concrete was established.The uniaxial dynamic tensile failure behavior of concrete materials under different nominal strain rates was simulated.The sudden increase of strain rate in the hardening and softening stages of a concrete uniaxial tensile stress-strain curve were also simulated in meso-scale.The effects of the sudden increase of strain rate on the dynamic tensile failure behavior and stress-strain curves were analyzed.The results show that the strain rate effect of concrete is relatively weak under low strain rate, while the strain rate effect is significantly enhanced under high strain rate.The dynamic tensile strength and corresponding peak strain resulted in by loading after the sudden increase of strain rate in the hardening stage are significantly enhanced.When the sudden increase of strain rate happens in the softening stage, the “softening behavior” changes to the “hardening behavior”, and a secondary peak appears on the stress-strain curve.The dynamic tensile strength obtained under combined loadings of initial strain rate and sudden strain rate is lower than that obtained under single loading of sudden strain rate, and the percentage of the decrease in strength increases with the increasing strain rate.

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concrete / dynamic tension / sudden increase of strain rate / meso-scale simulation / strain rate effect

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JIN Liu，YU Wenxuan，DU Xiuli. Effect of the sudden increase of strain rate on concrete dynamic tensile failure based on 3D meso-scale simulation[J]. Journal of Vibration and Shock, 2021, 40(2): 39-48

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