Abstract
Carbon nanofibers (CNFs) were used as admixtures to modify traditional concrete, and carbon nanofibers reinforced concrete (CNFC) with fiber volume fraction of 0%, 0.1%, 0.2%, 0.3% and 0.5% were prepared. The dynamic splitting tensile tests of concrete with different fiber volume contents under five loading rates were carried out by using the Φ100 mm split Hopkinson pressure bar (SHPB) test device. Based on the observation and analysis of the failure modes of the specimens, combined with the energy change rate of incident wave, the failure characteristics of CNFC under dynamic splitting tensile load are expounded. The results show that: the addition of CNFs has a certain inhibition effect on the dynamic splitting tensile failure of concrete; the failure modes of the specimens are the central failure along the loading direction; with the increase of the energy change rate of incident wave, the damage degree of the specimen is gradually aggravated.
Highlights
In recent years, with the continuous development of various high-performance, high-precision and high damage weapons, military protection engineering is facing more adverse factors such as stronger external stress, stronger weapon penetration, stronger explosion impact
As the chemical properties of carbon nanofibers are relatively stable and will not react with the components in concrete, it can be used as an admixture to modify the traditional concrete, so as to prepare a new composite material, namely carbon nanofibers reinforced concrete (CNFC)
The dynamic splitting tensile tests of CNFC were carried out by using the Φ100 mm split Hopkinson pressure bar (SHPB) test device, and its failure characteristics under the dynamic splitting tensile load were analyzed based on the failure mode
Summary
With the continuous development of various high-performance, high-precision and high damage weapons, military protection engineering is facing more adverse factors such as stronger external stress, stronger weapon penetration, stronger explosion impact. Carbon nanofibers (CNFs) are a form of carbon fibers grown in chemical vapor phase. They are a kind of discontinuous nanometer sized graphite fibers prepared by pyrolysis of gaseous hydrocarbons. As the chemical properties of carbon nanofibers are relatively stable and will not react with the components in concrete, it can be used as an admixture to modify the traditional concrete, so as to prepare a new composite material, namely carbon nanofibers reinforced concrete (CNFC). Most of the loads in wartime are strong loads such as explosion and impact, so it is necessary to carry out the experimental research on tensile failure of carbon nanofiber reinforced concrete under dynamic load. The dynamic splitting tensile tests of CNFC were carried out by using the Φ100 mm split Hopkinson pressure bar (SHPB) test device, and its failure characteristics under the dynamic splitting tensile load were analyzed based on the failure mode
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