Development of Zylon-Kevlar-Zylon Hybrid Fiber Reinforcement Technology for 100 T Pulsed Magnet at the WHMFC

The reinforcement technology combining Zylon/epoxy composite and Kevlar/epoxy composite has been proposed to design the 100 T Pulsed Magnet at the Wuhan National High Magnetic Field Center (WHMFC). The reinforcement layers in the preliminary 100 T pulsed magnet consisted of Zylon/epoxy composite, which is replaced with Zylon-Kevlar-Zylon hybrid fiber in the layers where the von Mises stress in Zylon/epoxy composite exceeds 3.5 GPa. Kevlar fabric has better wet impregnation properties with epoxy due to its rougher surface than Zylon fiber, which can effectively prevent shear movement of the conductor layer and the reinforcement layer. The simulation shows that the maximum von Mises stress in the Zylon-Kevlar-Zylon hybrid fiber is 3.68 GPa. The measured ultimate tensile strength (UTS) is 4.97 GPa via the explosion test with small pulsed magnet, which shows that the new reinforcement technology meets the stress requirements for 100 T.