The no-insulation (NI) winding approach can remarkably improve the thermal stability of high-temperature superconducting coil. However, mechanical issues have gradually become a key factor to block the development of NI magnets in recent years. This paper mainly analyzes the effect of the overband on the mechanical behaviors of an NI coil during a quench. A numerical model including a quench model combined with a three-dimensional homogeneous mechanical model is employed to study the change of stress in the coil without and with the overband during a local quench. The results show that the overband has an obvious effect on the stress distribution as the heater is located at the outer turn of the coil. Meanwhile, the values of stress in the coil are also affected by the overband. Moreover, the effects of the thickness of the overband and the location of the heater on the mechanical behaviors of the coil are also discussed. It is worth noting that the overband can remarkably reduce the hoop and axial tensile stresses of the coil during a quench

无绝缘（NI）绕组方式可以显着提高高温超导线圈的热稳定性。然而，近年来，机械问题逐渐成为阻碍镍磁体发展的关键因素。本文主要分析了超带对NI线圈失超时力学行为的影响。采用包括失超模型和三维均匀力学模型的数值模型来研究局部失超期间线圈中没有和有超带的应力变化。结果表明，当加热器位于线圈外圈时，超带对应力分布有明显影响。同时，线圈中的应力值也受超带影响。而且，还讨论了外带厚度和加热器位置对线圈机械性能的影响。值得注意的是，超带可以显着降低失超过程中线圈的环向和轴向拉应力