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Research on the Dynamic Mechanical Properties and Energy Dissipation Rules of Gradient Materials
  • +3
  • Yuantong Zhang,
  • Yang Renshu,
  • Chen Jun,
  • Chengxiao Li,
  • Zhai Boyang,
  • Zhu Rui
Yuantong Zhang
University of Science and Technology Beijing School of Civil and Resources Engineering

Corresponding Author:[email protected]

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Yang Renshu
University of Science and Technology Beijing School of Civil and Resources Engineering
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Chen Jun
China University of Mining and Technology - Beijing
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Chengxiao Li
University of Science and Technology Beijing School of Civil and Resources Engineering
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Zhai Boyang
University of Science and Technology Beijing School of Civil and Resources Engineering
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Zhu Rui
China University of Mining and Technology - Beijing
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Abstract

In engineering practice, the strength of layered rock often changes in a gradient manner, and the failure mode and strength under dynamic loads of strength gradient composites are important indicators for evaluating their mechanical properties. The Split Hopkinson Pressure Bar (SHPB) technology can measure the material’s constitutive relationship under a fixed strain rate, which is one of the basic means of dynamic mechanics testing. This article uses the SHPB device to conduct dynamic compression tests on sandstone gradient rock, studies its dynamic mechanical properties, and combines the DIC method to study the deformation field and strain field of the test piece, analyzing the dynamic failure mode of strength gradient composites under different impact speeds. By introducing the concept of equivalent wave impedance, it systematically expounds the impact of the impedance ratio in gradient composites and the length of incident waves on the transmission coefficient.