A study on impact compression mechanical properties of PP/CF reinforced coral sand cement-based composites

ZHENG Zhihao; REN Huiqi; LONG Zhilin; GUO Ruiqi; CAI Yang; LI Zhijian

doi:10.11883/bzycj-2021-0297

Volume 42 Issue 7

Jul. 2022

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ZHENG Zhihao, REN Huiqi, LONG Zhilin, GUO Ruiqi, CAI Yang, LI Zhijian. A study on impact compression mechanical properties of PP/CF reinforced coral sand cement-based composites[J]. Explosion And Shock Waves, 2022, 42(7): 073104. doi: 10.11883/bzycj-2021-0297

Citation:

ZHENG Zhihao, REN Huiqi, LONG Zhilin, GUO Ruiqi, CAI Yang, LI Zhijian. A study on impact compression mechanical properties of PP/CF reinforced coral sand cement-based composites[J]. Explosion And Shock Waves, 2022, 42(7): 073104. doi: 10.11883/bzycj-2021-0297

Citation:

ZHENG Zhihao, REN Huiqi, LONG Zhilin, GUO Ruiqi, CAI Yang, LI Zhijian. A study on impact compression mechanical properties of PP/CF reinforced coral sand cement-based composites[J]. Explosion And Shock Waves, 2022, 42(7): 073104. doi: 10.11883/bzycj-2021-0297

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A study on impact compression mechanical properties of PP/CF reinforced coral sand cement-based composites

doi: 10.11883/bzycj-2021-0297

1.
College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan 411105, Hunan, China
2.
Institute of Defense Engineering, Military Academy of Sciences, Luoyang 471023, Henan, China

Received Date: 2021-07-09
Rev Recd Date: 2021-11-19

Available Online: 2022-06-10

Publish Date: 2022-07-25

Abstract

Abstract

Four kinds of carbon-polypropylene hybrid fiber reinforced coral sand cement-based composites with different fiber content were obtained by mixing carbon fiber and polypropylene fiber into coral sand cement-based composites prepared by artificial seawater. Impact compression tests of this material under five strain rates were carried out with a 100-mm diameter split Hopkinson pressure bar. The parameters of Holmquist-Johnson-Cook model are determined by experimental data and parameter debugging. Based on Holmquist-Johnson-Cook model, LS-DYNA is used to simulate the impact compression of this material. By analyzing the failure mode, stress-strain curve and energy dissipation of the test blocks, the impact compression mechanical properties of carbon-polypropylene hybrid fiber reinforced coral sand cement-based composites are studied. The results are as follows. (1) The critical value of test strain rate is 200 s⁻¹; when the test strain rate is greater than 200 s⁻¹, the fiber network formed by hybrid carbon fiber and polypropylene fiber strengthens the toughening effect of the test block. (2) The peak stress of carbon-polypropylene hybrid fiber reinforced coral sand cement-based composites exhibits obvious strain rate effect, and the dynamic increase factor is highly sensitive to the strain rate. (3) The use of fine aggregate of coral sand results in more defects such as micro-cracks and micro-voids in the test block; after mixing carbon fiber and polypropylene fiber into the coral sand cement-based composites, the improvement of the impact compressive strength of the test block is limited, but the impact toughness of the coral sand cement-based composites is significantly enhanced. (4) LS-DYNA is used to numerically simulate the impact compression test process of hybrid carbon fiber (15.75 kg/m³) and polypropylene fiber (1.82 kg/m³), while the error between the simulation results of peak stress and the test results is within 5.97 %. The study is of great significance for the preparation of high performance coral sand cement-based composites and the emergency repair of offshore islands and reefs.
- carbon fiber,
- polypropylene fiber,
- coral sand cement-based composites,
- split Hopkinson pressure bar,
- impact compression mechanical properties,
- LS-DYNA

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References(28)

References

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