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<p>Curing deformation is a typical challenge that troubles the precise molding of carbon fiber reinforced plastics (CFRP) box structure, and the curing process parameters are the key factors affecting curing deformation. In this study, a multi-physics finite element simulation model incorporating thermal-chemical reactions, curing kinetics and residual stress, is established for simulating the molding process of CFRP box structure. The effects of curing process parameters such as heating rate, holding temperature and time, cooling rate, and curing pressure on the curing temperature field, curing degree, and residual stress are systematically analyzed. Based on the simulation results, a three-factor and three-level orthogonal experiment is designed and conducted to establish a response surface model for the residual stress and demolding deformation after curing. The results indicate that the cooling rate has a more significant impact on the curing behavior of the CFRP box structure compared to other curing process parameters. When the cooling rate is increased to 3.5&#xa0;°C/min, the residual stress of the CFRP box structure rises by 0.27%, while the deformation increases by 3.05%. Higher curing pressure can assist in improving the thickness uniformity of the CFRP box structure and slightly reduces residual stress and deformation.</p> Graphical abstract <p></p>

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Analysis of curing deformation and optimization of process parameters for carbon fiber reinforced plastics box structure using numerical simulation

  • 期刊论文

  • 发表日期：

    2026年7月21日

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  • Qiang Li,
  • Shujian Li,
  • Tong Peng,
  • Hongfei Pei,
  • Tengfei Chang,
  • Wenhui Yue

摘要

Curing deformation is a typical challenge that troubles the precise molding of carbon fiber reinforced plastics (CFRP) box structure, and the curing process parameters are the key factors affecting curing deformation. In this study, a multi-physics finite element simulation model incorporating thermal-chemical reactions, curing kinetics and residual stress, is established for simulating the molding process of CFRP box structure. The effects of curing process parameters such as heating rate, holding temperature and time, cooling rate, and curing pressure on the curing temperature field, curing degree, and residual stress are systematically analyzed. Based on the simulation results, a three-factor and three-level orthogonal experiment is designed and conducted to establish a response surface model for the residual stress and demolding deformation after curing. The results indicate that the cooling rate has a more significant impact on the curing behavior of the CFRP box structure compared to other curing process parameters. When the cooling rate is increased to 3.5 °C/min, the residual stress of the CFRP box structure rises by 0.27%, while the deformation increases by 3.05%. Higher curing pressure can assist in improving the thickness uniformity of the CFRP box structure and slightly reduces residual stress and deformation.

Graphical abstract