一种辐轮式低温支撑的热学与力学性能实验

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200 K以下时PEEK材料热导率小于GRP材料，200 K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。

Experimental study of the thermal and mechanical performance of a spoke-wheel cryogenic support

A special spoke-wheel cryogenic support structure was introduced, with the experimental study of its thermal and mechanical performance of different materials and different spoke quantity and cross-section shape. The study included thermal conductivity experimental measurements of both polyether-ether-ketone (PEEK) and glass fiber reinforced plastic (GRP) material, thermal resistance measurements and the mechanical tensile failure tests of a variety of support wheels which have different structural forms of PEEK and GRP. The various experimental results were analyzed and compared, with the measurement error analysis. The results show that, when the temperature is below 200K, the thermal conductivity of the PEEK material is less than that of the GRP material, but they are almost the same above 200K. The thermal resistance of the support wheel decreases with the increase of the number of spokes and the spoke cross-sectional area, and the measured thermal resistance is a comprehensive result of the solid thermal conduction and thermal radiation. The mechanical performance of the support wheel is improved by the increase of the number of spokes and the spoke cross-sectional area, and the load bearing capability of the support of the GRP material is larger in the radial direction than in the axial direction, while that of the PEEK material is nearly same in both directions. That is mainly due to the anisotropic properties of GRP material. Eventually, the support wheel of PEEK material with 6 ribbed spokes is the best choice by integrating thermal and mechanical performance test results.