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<p>Creep behavior plays an important role in the long-term reliability of composite structures, but its nonlinear and time-dependent nature makes accurate prediction difficult. In this study, a combined experimental-theoretical-numerical approach is proposed to characterize the nonlinear creep behavior of fiber-reinforced composites under different stress levels. First, a three-dimensional constitutive model is proposed based on the generalized Hill yield criterion and the Perzyna overstress function to describe multiaxial viscoplastic flow with tension-compression asymmetry. The model further incorporates the strain-rate dependence of the yield stress through the Eyring function, which improves the description of the initial rapid creep response. Then, the model is implemented into ABAQUS software through a user-defined subroutine using an algorithmic tangent operator and a return-mapping-type stress update algorithm. Finally, the proposed model is validated against compression creep experiments over a stress range from 20 to 80&#xa0;MPa, and its predictive performance is systematically compared with those of the time-dependent consititutive models, showing consistently better agreement with the experimental results. The proposed approach provides a practical tool for long-term creep prediction and reliability assessment of composite structures.</p>

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Anisotropic viscoelastic-viscoplastic constitutive modeling of creep in fiber-reinforced polymer composites

  • 期刊论文

  • 发表日期：

    2026年6月22日

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  • Jingwen Yang,
  • Yilong Ren,
  • Yuan Song,
  • Xiaokai Mu,
  • Bo Yuan,
  • Qingchao Sun

摘要

Creep behavior plays an important role in the long-term reliability of composite structures, but its nonlinear and time-dependent nature makes accurate prediction difficult. In this study, a combined experimental-theoretical-numerical approach is proposed to characterize the nonlinear creep behavior of fiber-reinforced composites under different stress levels. First, a three-dimensional constitutive model is proposed based on the generalized Hill yield criterion and the Perzyna overstress function to describe multiaxial viscoplastic flow with tension-compression asymmetry. The model further incorporates the strain-rate dependence of the yield stress through the Eyring function, which improves the description of the initial rapid creep response. Then, the model is implemented into ABAQUS software through a user-defined subroutine using an algorithmic tangent operator and a return-mapping-type stress update algorithm. Finally, the proposed model is validated against compression creep experiments over a stress range from 20 to 80 MPa, and its predictive performance is systematically compared with those of the time-dependent consititutive models, showing consistently better agreement with the experimental results. The proposed approach provides a practical tool for long-term creep prediction and reliability assessment of composite structures.