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<p>Epoxy polymer concrete (EPC) is essential for protective infrastructures, yet its reliable application is hindered by a lack of mechanism-informed dynamic models. This study systematically investigates the dynamic compressive behavior of EPC using split-Hopkinson pressure bar testing at strain rates ranging from 90 to 171&#xa0;s⁻<sup>1</sup>. By integrating the Zhu-Wang-Tang (ZWT) nonlinear viscoelastic framework with irreversible thermodynamics, a novel evolutionary damage constitutive model is developed. The core innovation lies in employing the dissipated energy density as a driving internal state variable to dynamically evolve model parameters, thereby unifying the descriptions of rate-dependent hardening and damage softening mechanisms. Experimental results reveal a pronounced strain-rate sensitivity, with the dynamic compressive strength increasing significantly from 88 to 118&#xa0;MPa. Furthermore, fractal analysis quantifies the fragmentation process, establishing a quantitative physical correlation between macroscopic energy dissipation and microscopic damage (with the fractal dimension increasing from 1.47 to 2.24). The proposed model demonstrates high fidelity in capturing the nonlinear stress–strain responses, providing a rigorous theoretical foundation for the safety design of EPC structures.</p>

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Fractal Analysis and Evolutionary Damage Constitutive Modeling for the Impact Response of Epoxy Polymer Concrete

  • 期刊论文

  • 发表日期：

    2026年8月5日

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  • Yuxuan Lin,
  • Yiping Liu,
  • Zejia Liu,
  • Bao Yang,
  • Licheng Zhou,
  • Zhenyu Jiang,
  • Liqun Tang

摘要

Epoxy polymer concrete (EPC) is essential for protective infrastructures, yet its reliable application is hindered by a lack of mechanism-informed dynamic models. This study systematically investigates the dynamic compressive behavior of EPC using split-Hopkinson pressure bar testing at strain rates ranging from 90 to 171 s⁻1. By integrating the Zhu-Wang-Tang (ZWT) nonlinear viscoelastic framework with irreversible thermodynamics, a novel evolutionary damage constitutive model is developed. The core innovation lies in employing the dissipated energy density as a driving internal state variable to dynamically evolve model parameters, thereby unifying the descriptions of rate-dependent hardening and damage softening mechanisms. Experimental results reveal a pronounced strain-rate sensitivity, with the dynamic compressive strength increasing significantly from 88 to 118 MPa. Furthermore, fractal analysis quantifies the fragmentation process, establishing a quantitative physical correlation between macroscopic energy dissipation and microscopic damage (with the fractal dimension increasing from 1.47 to 2.24). The proposed model demonstrates high fidelity in capturing the nonlinear stress–strain responses, providing a rigorous theoretical foundation for the safety design of EPC structures.