Test study on dynamic mechanical properties of cement mortar-granitecomposite layer after high temperature

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (11) : 176-184.

GU Linlin1, YIN Kefei1, WANG Zhen2, WU Gu3, HE Pengtao2

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Abstract

In order to study the dynamic mechanical characteristics of cement mortar-granite composite layer after high temperature, the dynamic compression test and static pressure comparison test of composite layer specimens were carried out using the split Hopkinson pressure bar (SHPB) equipment, taking temperature and loading rate as variable parameters. The results show that: both dynamic compressive strength and dynamic strength growth factor (DIF) has significant strain rate effect. When the strain rate is lower than 45s-1, DIF decreases monotonically with temperature increaseing, while DIF decreases and then increases with temperature increasing when strain rate higher than 45s-1. After the high temperature, the interface bonding of the composite layer weakens, and the differentiation of failure morphology of cement mortar and granite increases with temperature rising. The clipping energy dissipation characteristics of the composite layer specimen shows low sensitivity to loading rate and high sensitivity to temperature. The peak stress ratio and energy dissipation rate do not change significantly with the change of loading rate. As high temperature reduces the equivalent wave impedance of the composite layer, the clipping ability is enhanced and the energy consumption effect is weakened. As the temperature increases, more incident energy is converted into reflection energy, the proportion of transmission energy and destruction energy decrease.

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SHPB / composite layer / high temperature / impact loads / dynamic mechanical properties

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GU Linlin1, YIN Kefei1, WANG Zhen2, WU Gu3, HE Pengtao2. Test study on dynamic mechanical properties of cement mortar-granitecomposite layer after high temperature[J]. Journal of Vibration and Shock, 2024, 43(11): 176-184

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