Strength and energy dissipation effect of fiber reinforced all-lightweight concrete-based on SHPB impact tests

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (2) : 148-153.

YANG Jianhui1,2,LI Xiaoya1,2,YE Yaqi1,2,WANG Xinyu1,2

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Abstract

Taking LC30 all-lightweight shale ceramsite concrete (ALWSCC) as a comparison criterion, static and SHPB tests were conducted on different kinds of fiber reinforced all-lightweight concrete (FRALWC), such as polypropylene fiber reinforced all-lightweight concrete (PFRALWC), steel fiber reinforced all-lightweight concrete (SFRALWC), multi-wall carbon nanotube fiber reinforced all-lightweight concrete (MCNFRALWC), and composite fiber reinforced all-lightweight concrete (CFRALWC).Then the LS-DYNA software was used to simulate the dynamic impact responses of plain concrete and SFALWC based on the modified HJC constitutive model.The results show that ALWC not only has the strain rate effect and the corresponding critical value, but also has the strength effect and energy effect.With the increase of strain rate, the dynamic peak stress, peak strain and total energy consumption increase.The dynamic stress growth coefficient has a significant correlation with the logarithm of strain rate.The mechanical properties of FRALWC are of different kinds and PFRALWC displays the best among all the FRALWC.The more the number of fiber types participated in, the better the mechanical properties of CFRALWC.The results of numerical simulations are similar to those of the experiments, but the peak stress of specimens and the falling segment of stress-strain curves are quite different, which shows that the applicability of HJC constitutive model has certain limitation for ALWC and FRALWC.

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fiber reinforced all-lightweight concrete(FRALWC) / shale ceramsite / split Hopkinson pressure bar(SHPB) impact / strain rate effect / finite element

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YANG Jianhui1,2,LI Xiaoya1,2,YE Yaqi1,2,WANG Xinyu1,2. Strength and energy dissipation effect of fiber reinforced all-lightweight concrete-based on SHPB impact tests[J]. Journal of Vibration and Shock, 2020, 39(2): 148-153

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