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<p>The bidirectional thermo-mechanical coupling effect during CF/PEEK drilling significantly impacts the hole quality and component safety, presenting a current challenge in relevant research. To tackle this issue, this paper establishes a constitutive model that incorporates temperature effects, based on quasi-static tensile tests and theoretical analyses of the elastic response, damage criterion, and stiffness reduction of CF/PEEK materials. A drilling thermo-mechanical monitoring platform is set up, and a bidirectional thermo-mechanical coupling model for drilling thermoplastic composites is established using the VUMAT subroutine. A simulation analysis method is proposed, and the reliability of the finite element model is verified. The results indicate that the average absolute errors of the maximum drilling axis force and the highest temperature obtained from the simulation and experiments for all process parameters are 5.255 and 4.34%, respectively. Notably, when the spindle speed reaches or exceeds 5000 r/min, the simulated hole temperature reaches the melting point, and resin melting and coating phenomena are observed in the microscopic morphology images.</p>

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A finite element analysis method for bidirectional thermo-mechanical coupling in thermoplastic composite drilling

  • 期刊论文

  • 发表日期：

    2025年2月15日

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  • Pingping Xiong,
  • Yangwei Zhou,
  • Zhichao Xu,
  • Laishui Zhou,
  • Zhenchao Qi

摘要

The bidirectional thermo-mechanical coupling effect during CF/PEEK drilling significantly impacts the hole quality and component safety, presenting a current challenge in relevant research. To tackle this issue, this paper establishes a constitutive model that incorporates temperature effects, based on quasi-static tensile tests and theoretical analyses of the elastic response, damage criterion, and stiffness reduction of CF/PEEK materials. A drilling thermo-mechanical monitoring platform is set up, and a bidirectional thermo-mechanical coupling model for drilling thermoplastic composites is established using the VUMAT subroutine. A simulation analysis method is proposed, and the reliability of the finite element model is verified. The results indicate that the average absolute errors of the maximum drilling axis force and the highest temperature obtained from the simulation and experiments for all process parameters are 5.255 and 4.34%, respectively. Notably, when the spindle speed reaches or exceeds 5000 r/min, the simulated hole temperature reaches the melting point, and resin melting and coating phenomena are observed in the microscopic morphology images.