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介绍了一种特殊的辐轮式低温支撑,针对这种不同材质和辐条数量及其截面形状的辐轮式结构,分别从热学性能和力学性能两方面进行了实验研究,测量了聚醚醚酮(PEEK)和玻璃钢(GRP)两种材料的热导率以及由这两种材料组成的多种结构形式的支撑轮的热阻,对试样进行力学拉伸破坏实验,并对实验结果进行了分析与比较,给出了误差分析。实验结果表明,温度在200K以下时PEEK材料热导率小于GRP材料,200K以上时两者相当;支撑轮的热阻随着辐条数量和截面积的增加而减小,且实验测得的热阻是固体传热和辐射换热的综合结果;支撑轮的力学性能随着辐条数量和截面积的增加而提高,GRP材料的支撑轮径向承受载荷能力较强、轴向偏弱,而PEEK材料的支撑轮各方向上承载能力较为均匀,这主要是因为GRP材料是各向异性的。综合热性能和力学性能实验结果,PEEK材料6辐带肋结构的支撑轮是最佳选择。
A special kind of spoke-type low-temperature support is introduced. According to the spoke-wheel structure with different material and number of spokes and its cross-sectional shape, the thermal and mechanical properties are studied respectively. The effects of polyetheretherketone (PEEK) and glass fiber reinforced plastic (GRP), and the thermal resistance of the support wheels of various structures composed of these two materials, the mechanical tensile failure test of the samples was carried out and the experimental results were carried out Analysis and comparison, gives the error analysis. The experimental results show that the thermal conductivity of PEEK material is lower than that of GRP material when the temperature is below 200K, and the thermal conductivity of the supporting wheel decreases with the increase of the number of spokes and the cross-sectional area. The thermal resistance Is a comprehensive result of heat transfer and radiation heat transfer. The mechanical properties of the support wheels increase with the number of spokes and the cross-sectional area. The GRP material support wheels have strong radial load capacity and axial weakness, while the PEEK materials The bearing capacity of the supporting wheels in all directions is more uniform, mainly because the GRP material is anisotropic. Based on the experimental results of thermal and mechanical properties, the support wheels with 6-spoke ribbed structure of PEEK are the best choice.