航空学报 > 2024, Vol. 45 Issue (16): 429703-429703   doi: 10.7527/S1000-6893.2023.29703

近零应力等效温度场驱动的CFRP复杂构件固化变形控制方法

曹关关, 许可()   

  1. 南京航空航天大学 机电学院,南京 210016
  • 收稿日期:2023-10-11 修回日期:2023-11-28 接受日期:2023-12-08 出版日期:2023-12-22 发布日期:2023-12-21
  • 通讯作者: 许可 E-mail:nuaa_xk@nuaa.edu.cn
  • 基金资助:
    国家自然科学基金面上项目(52175466)

Optimized distortion control method of CFRP curing region temperature field driven by near⁃zero stress equivalent temperature field

Guanguan CAO, Ke XU()   

  1. College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China
  • Received:2023-10-11 Revised:2023-11-28 Accepted:2023-12-08 Online:2023-12-22 Published:2023-12-21
  • Contact: Ke XU E-mail:nuaa_xk@nuaa.edu.cn
  • Supported by:
    National Natural Science Foundation of China(52175466)

摘要:

碳纤维树脂基复合材料(CFRP)构件的固化变形直接影响构件装配后的力学性能及服役寿命。现阶段采用的修模、结构优化等固化变形控制方法存在工艺周期长,迭代成本高等问题。微波加热和自阻电热等选择性加热方法有潜力实现固化温度场的精准调控,进而通过构造不均匀温度场产生热应力来对冲原有的固化变形。针对如何构造不均匀温度场这一典型反问题,推导并定义出近“零应力”等效温度场,原理上可对冲构件脱模前的残余应力场实现近“零应力”固化,从而抑制脱模后的固化变形。针对实际固化温度工艺约束,设计了自适应压缩分割算法对理论等效温度场进行近似分区。在典型双曲面零件和回转体零件上进行了初步验证,相比于传统的等温固化工艺,固化变形和残余应力均减少了近50%;相比于仅考虑固化变形的温度工艺优化方法,固化变形和残余应力均减少了近15%。

关键词: 碳纤维树脂基复合材料, 固化变形, 分区温度场, 图像处理, 变形控制

Abstract:

The cure-induced distortion of Carbon Fiber Resin Matrix Composite (CFRP) components directly affects the mechanical properties and service life of the components after assembly. However, the cure-induced distortion control methods such as tool compensation and structure optimization have the problems of long process cycle time and high cost of iteration. Selective heating methods, such as microwave heating and self-resistive heating, have the potential to realize precise control of the curing temperature field, and generate thermal stresses to hedge the original cure-induced distortion by constructing an uneven temperature field. In this paper, the typical inverse problem of how to construct an inhomogeneous temperature field, a quasi “zero-stress” equivalent temperature field is derived and defined, which in principle can hedge the residual stress field of the component before demolding to achieve a quasi “zero-stress” curing, and thus inhibit the curing deformation after demolding. An adaptive compression partitioning algorithm is designed to partition the theoretical equivalent temperature field with respect to the actual curing temperature process constraints. The method is preliminarily validated on typical hyperbolic and rotary parts, and the results show that compared with isothermal curing, the curing deformation and residual stress are reduced by nearly 50%; compared with the temperature field optimization method that only considers the curing deformation, the curing deformation and residual stress are also reduced by nearly 15%.

Key words: carbon fiber resin matrix composite, cure-induced distortion, regional temperature field, image processing, distortion control

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