Supervisor:
Southwest Ordnance Industry Bureau
Organizer:
Chongqing Ordnance Industry Society
Chongqing University of Technology
Chongqing University of Technology
Numerical simulation studies on the impact resistance of coral concrete
| DOI: | 10.11809/bqzbgcxb2023.11.007 |
| Keywords: | coral concrete; strain rate effect; impact response; numerical simulation |
| Abstract: | To investigate the effect of fiber, sand binder ratios, and water binder ratios on the impact resistance performance of coral concrete, this paper uses LS DYNA software to numerically simulate the impact response process of high performance coral concrete. The influence of fiber content, sand binder ratio, and water binder ratio on the fracture morphology, compressive strength, elastic modulus, and toughness of coral concrete under different strain rates is discussed in particular. The simulation results show that: (1) Increasing the fiber content can significantly improve the compressive strength of coral concrete, especially under high strain rate loading. When the fiber content increases from 0.6% to 1.2%, the DIF fc grows by about 22.2% under a loading speed of 20 m/s. Moreover, the effect of fiber content on the elastic modulus and toughness is strongly related to the strain rate. At lower loading speeds (v≤14 m/s), increasing fiber content decreases the elastic modulus and toughness, while at higher loading speeds (v≥16 m/s), increasing fiber content improves the elastic modulus and toughness. (2) Increasing the sand binder ratio can significantly improve the compressive strength of coral concrete but reduces the elastic modulus, when the sand binder ratio increases from 0.8 to 1.0, the overall increase in DIF fc is about 0.2, and the overall decrease in DIF E is about 0.05. (3)Increasing the water binder ratio can improve the elastic modulus of coral concrete, when the water binder ratio increases from 0.22 to 0.25, the overall increase in DIF E is about 0.1. The influence of water binder ratio on compressive strength and toughness is strongly related to the strain rate. At lower loading speed (approximately less than 13 m/s), increasing water binder ratio improves the compressive strength and toughness of coral concrete, while at higher loading speeds (approximately greater than 13 m/s), increasing water binder ratio reduces compressive strength and toughness. |
| Issue: | Vol. 44 No. 11 (2023) |
| Published: | 2023-11-28 |
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