G—10CR玻璃布／环氧层压板低温剪切力学性能

纤维复合材料极低温力学性能的试验研究国内尚处于空白阶段。利用国际间的多国合作计划，采用三点弯曲和层间剪切两种试验方法，对G－10CR玻璃布／环氧层压板的低温剪切性能进行了对比研究。试验结果发现该材料低温下的剪切强度较室温有明显增加，且低温下表现出了和室温不同的破坏机制。

SHEAR PROPERTIES OF G-10CR GLASS-CLOTH/EPOXY LAMINATES AT LOW TEMPERATURE

Because of the large forces encountered in large superconducting energy stoarge mag- nets, forces have to be transmitted through high strength struts to the room temperature structure. Besides strength, the material of these struts has to have a low thermal conductivity in order to minimize the refrigeration requirement for the energy storage system. Among of them, G10-CR Glass-cloth/Epoxy is an ideal material as struts. In this paper, according to the requirement of the intercomparison program, two methods, three-point-bend and interlaminar shear, were used to research the shear properties of G10-CR Glass-cloth/Epoxy at 293 K, 77K and 4.2 K. The experi- mental results showed, as the temperature decreased from 293 K (room temperature) to 77 K, the shear strnegth of G10-CR Glass-cloth/Epoxy had a rapid increase. However, with decreasing the temperature continuously (from 77 K to 4.2 K), it would not change apparently. Furthermore, the results got by three-point-bend and interlaminar shear were coincident, which meant they could be replaced by each other. By the experiment, it also demonstrated that different destroying mecha- nisms might be existed for G10-CR Glass-cloth/Epoxy from room temperature to low-temperature.