高精度碳纤维增强树脂复合材料夹层天线面板热变形影响参数仿真与实验

为满足亚毫米波、太赫兹波段等高频天线反射面的应用需求，采用附加树脂修型技术制得1米级、面形精度优于10 μm均方差(RMS)的碳纤维增强树脂(CFRP)复合材料天线面板。主要开展了针对高精度CFRP复合材料面板在极端低温环境下的热变形机制研究。根据基础材料性能测试数据，建立面板的有限元仿真模型，预测大温差工况下多结构参数面板的热变形残差，分析了影响面板热变形特性的主要因素。比较了铝蜂窝和碳管阵列夹芯两种面板结构热变形特性的差异。结果表明，碳管夹芯结构面板具备更高的比刚度和热稳定性。通过仿真结构优化给出了面板的结构设计参数，并重新试制了原型面板。采用基于高精度数字摄影测量的实验方法，对铝蜂窝和碳管阵列两种夹芯结构原型面板在低温环境下的热变形误差进行了测量，通过分析实验与仿真结果的误差来源，讨论了有限元预测方法的可行性，给出了针对高精度CFRP复合材料面板设计及工艺方法的指导意见。 

Simulation and experiment on thermal deformation influence parameters of high accuracy carbon fiber reinforced plastic sandwiched antenna panels

A one-meter-level carbon fiber reinforced plastic(CFRP) composite antenna panel with the surface error less than 10 μm root-mean-square(RMS) has been trial-produced by using additional resin modification technology to satisfy the requirements of high frequency antenna reflector in submillimeter and terahertz wave band. The thermal deformation mechanisms of the high accuracy CFRP composite panel under extreme low temperature were studied. Based on the test data of the basic material, a finite element model was established to predict the thermal deformation residual error of the the panels considering different parameters under the condition of large temperature difference. The main factors affecting the thermal deformation characteristics of the panel were analyzed. The thermal deformation characteristics of the panels with aluminum honeycomb and CFRP composite tube array cores were compared, respectively, which shows that the higher specific stiffness and thermal stability are provided by the panel structure with CFRP composite tube array core. The structural design parameters of the prototype panel were given after the structural optimization, and the prototype panels were remanufactured. The thermal deformation residual errors of prototype panels with aluminum honeycomb and CFRP composite tube array cores were measured by the experimental method of high precision photogrammetry. The guidance for the design and process of high accuracy CFRP composite sandwiched panels was provided.