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<p>Uniaxial tensile creep tests were conducted at various stress levels to investigate the creep properties of hydroxy-terminated polybutadiene (HTPB) propellant. Due to the limitations of the classical time-hardening model and the Burgers model in predicting the nonlinear creep behavior of HTPB propellant, a new creep damage model was developed. This model combines linear viscoelasticity theory with continuum damage theory. Utilizing the user material subroutine UMAT provided by ABAQUS for the secondary development of the models, simulation calculations were performed on dumbbell specimens. A comparative analysis was conducted with the results from the time-hardening model and the Burgers model, and the simulation results were validated through experimental testing. The findings indicate that HTPB propellant exhibits a distinct three-stage process characterized by decay creep, stable creep, and accelerated creep. The creep damage model effectively describes the accelerated creep stage, with the simulation results demonstrating an error margin of less than 5%. This confirms the feasibility of the creep damage model for creep analysis of HTPB propellant.</p>

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Research on creep damage model and finite element simulation of HTPB propellant

  • 期刊论文

  • 发表日期：

    2025年6月5日

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  • Xuan Wu,
  • Jian Zheng,
  • Jin-sheng Xu,
  • Chang-sheng Zhou,
  • Zong-tao Guo

摘要

Uniaxial tensile creep tests were conducted at various stress levels to investigate the creep properties of hydroxy-terminated polybutadiene (HTPB) propellant. Due to the limitations of the classical time-hardening model and the Burgers model in predicting the nonlinear creep behavior of HTPB propellant, a new creep damage model was developed. This model combines linear viscoelasticity theory with continuum damage theory. Utilizing the user material subroutine UMAT provided by ABAQUS for the secondary development of the models, simulation calculations were performed on dumbbell specimens. A comparative analysis was conducted with the results from the time-hardening model and the Burgers model, and the simulation results were validated through experimental testing. The findings indicate that HTPB propellant exhibits a distinct three-stage process characterized by decay creep, stable creep, and accelerated creep. The creep damage model effectively describes the accelerated creep stage, with the simulation results demonstrating an error margin of less than 5%. This confirms the feasibility of the creep damage model for creep analysis of HTPB propellant.