Numerical simulation and analysis of SHPB test for UHPC material based on shaper

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (21) : 44-52.

REN Liang1，2，HE Yu1，WANG Kai1

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Abstract

To explore the means to realize constant strain rate loading and specimen stress equilibrium in SHPB tests for UHPC material, numerical simulation and analysis using the finite element software LS-DYNA were performed through varying material, diameter and thickness of shaper.The dynamic damage behavior of UHPC material was fitted through optimizing material parameters of the KCC damage model in LS-DYNA.An impact compression numerical model for UHPC material based on SHPB technique was established and verified with tests.Finally, the effects of shaper’s material, thickness and diameter on constant strain rate loading and specimen stress equilibrium in SHPB tests were studied.The results showed that the shaper is an effective means to realize constant strain rate loading and specimen stress equilibrium; the smaller constant strain rate factor (CSRF) can be obtained using an aluminum shaper compared with using a copper shaper to better realize constant strain rate loading; when the shaper diameter increases to a certain level, incident wave propagation deviates from one-dimensional stress wave, so the diameter of the shaper should not be larger than 0.4 times the rod diameter; to balance CSRF value and incident wave strength in loading process, the ratio of length to diameter of the shaper should not be larger than 0.2.

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UHPC / pulse shaper / constant strain rate / stress equilibrium / numerical simulation

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REN Liang1，2，HE Yu1，WANG Kai1. Numerical simulation and analysis of SHPB test for UHPC material based on shaper[J]. Journal of Vibration and Shock, 2019, 38(21): 44-52

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