超导电流传输线导体等效弹性模量的预测

国际热核聚变实验堆（ITER）超导电流传输线导体的内部电缆体由超导股线和纯铜股线经多级绞缆后复合而成，相对柔软。在传统复合材料理论的基础上，对ITER超导电流传输线导体等效弹性模量进行理论预测：预测一，只考虑电缆体外的不锈钢导管、双绝缘和双屏蔽层；预测二，忽略柔性电缆体的影响，但考虑其内部氦管;预测三，假设电缆体呈各向同性，弹性模量取1～10GPa；预测四，利用均匀化理论分析电缆体的等效弹性模量，复合材料损伤理论分析超导电缆与中心氦管之间、电缆复合体和不锈钢导管之间界面情况。预测值与参考实验值进行比较证实，预测四较符合实际情况，电缆体对整个超导电流传输线导体等效弹性模量的影响较小。

Predictions of Equivalent Modulus of Superconducting Busbar

The cable body of the superconducting busbar conductor for ITER by the multistage twist of the superconductivity strand and the pure copper strand is quite soft. How to process it affects the equivalent prediction of the entire conductor performance. According to the traditional composite theory, the following several predictions were carried: only consider the functions of the stainless steel conduit outside the cable body, the double insulation and the double shielding layer; the influence of the flexible cable body is neglect, so only consider the function of its internal helium tube; the material nature of the cable body is assumed the isotropism, which the elasticity modulus is 1-10 GPa (here taking 2 GPa); combining the homogenization theory with the composite damage theory. Finally, the equivalent elasticity modulus and the reference experimental moduli were compared. The result of the last prediction is relatively reasonable and the influence of the cable body to the superconducting busbar conductor is very small.