碳纤维/环氧复合材料大开口支架结构固化变形仿真模拟

梁春祖; 罗锦涛; 刘强; 孙天峰; 宋子蝶

doi:10.3969/j.issn.1674-6457.2025.09.021

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精密成形工程 ›› 2025, Vol. 17 ›› Issue (9) : 212-221. DOI: 10.3969/j.issn.1674-6457.2025.09.021

复合材料成形

碳纤维/环氧复合材料大开口支架结构固化变形仿真模拟

梁春祖¹, 罗锦涛¹, 刘强¹, 孙天峰^1,*, 宋子蝶^1,2

作者信息 +

Finite-element Investigation into Curing-induced Deformations of Carbon/Epoxy Composite Large-opening Support Structures

LIANG Chunzu¹, LUO Jintao¹, LIU Qiang¹, SUN Tianfeng^1,*, SONG Zidie^1,2

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文章历史 +

摘要

目的建立高模量碳纤维增强树脂基复合材料大开口支架的结构变形预测模型,旨在揭示材料固化-热收缩效应与大开口结构设计的耦合变形机制。方法首先对高模量碳纤维复合材料体系进行性能表征,其次利用黏弹性本构模型,通过有限元仿真方法研究了固化前后开口顺序工艺对支架整体结构变形的影响。结果与先固化后开口的工艺相比,当使用先开口后固化的工艺时,固化变形更小,减小约0.56 mm;但前者的残余应力更大,两者相差20 MPa以上。这是由于先固化后开口工艺的残余应力释放,导致产生了更大变形。结论建立了考虑固化度和温度对复合材料力学性能影响的黏弹性本构模型,实现了复合材料层合板固化变形翘曲的精确预测。此外,从变形控制方面考虑,确定了碳纤维/环氧复合材料开口工艺路线。

Abstract

The work aims to establish a predictive model for the overall deformation of a large-opening support structure made of high-modulus carbon fiber reinforced polymer (CFRP) composites, incorporating the effects of the inherent curing shrinkage and thermal deformation of the composite and the structural design of the large opening. Firstly, the performance of the high-modulus carbon fiber composite system was characterized. Subsequently, the viscoelastic constitutive model was employed to explore the impact of the opening sequence process before and after curing on the overall structural deformation of the support structure through the finite element method. Compared to the process of first curing and then opening, the process of first opening and then cutting resulted in less curing deformation, reducing it by approximately 0.56 mm. However, the residual stress of the former was greater, with a difference of over 20 MPa between the two processes. This was because the process of first curing and then opening released residual stresses, which led to greater deformation. A viscoelastic constitutive model that captures the coupled effects of curing degree and temperature on the mechanical properties of composites is established, which accurately predicts deformation and warpage in composite laminates. Based on these predictions, a deformation-control strategy is implemented to ultimately define an optimized curing process for the carbon fiber/epoxy composites.

导出引用

梁春祖, 罗锦涛, 刘强, 孙天峰, 宋子蝶. 碳纤维/环氧复合材料大开口支架结构固化变形仿真模拟[J]. 精密成形工程. 2025, 17(9): 212-221 https://doi.org/10.3969/j.issn.1674-6457.2025.09.021

LIANG Chunzu, LUO Jintao, LIU Qiang, SUN Tianfeng, SONG Zidie. Finite-element Investigation into Curing-induced Deformations of Carbon/Epoxy Composite Large-opening Support Structures[J]. Journal of Netshape Forming Engineering. 2025, 17(9): 212-221 https://doi.org/10.3969/j.issn.1674-6457.2025.09.021

中图分类号： TB332

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