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Abstract:
To explore the dynamic properties of asphalt concrete under severe dynamic loading, the apparatus of servo hydraulic machine and split Hopkinson pressure bar (SHPB) were employed to conduct the dynamic compression test for asphalt concrete material. The dynamic increase factor (DIF) and dynamic stress-strain curve were then obtained for asphalt concrete under middle to high strain rates. At same time, the advanced elasto-plastic damaged model strain rate effect was used to simulate the dynamic behavior of asphalt concrete in SHPB test. The key parameters for the selected material models, i.e. parameters of strength surfaces and the damage factor, were calibrated and quantified through laboratory tests. The results obtained are stated as follows: the apparatus of hydraulic servo machine and SHPB can be effectively used to obtain the DIF curve for asphalt concrete under middle to high strain rates. The compressive strength of asphalt concrete increased with the enhancement of strain rates. Laboratory tests can be used to quickly determine the key parameters of advanced elasto-plastic damaged model in order to represent the dynamic stress strain behavior of asphalt concrete. It was also found that the compressive DIFs of asphalt concrete obtained from SHPB test should consider contribution from two factors, one was the moisture effect at lower stain rates which was related to the first branch of DIFs curve obtained from SHPB test, and another was the lateral inertial confinement effect at higher stain rates which was related to the second branch of DIFs curve obtained from SHPB test. However, for the numerical model of asphalt concrete under dynamic loading, adopting the DIFs curve obtained from SHPB test would duplicate the inertial effects. Hence, when the numerical simulation of asphalt concrete under high strain rate loading was conducted, the second phase of compressive DIF obtained from SHPB test should not be considered, that is, the compressive DIFs obtained from SHPB test should be modified. © 2017, Editorial Board of Journal of Tianjin University(Science and Technology). All right reserved.
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Journal of Tianjin University Science and Technology
ISSN: 0493-2137
Year: 2017
Issue: 9
Volume: 50
Page: 921-930
Cited Count:
WoS CC Cited Count: 0
SCOPUS Cited Count: 3
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 12
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