Non-destructive wire-wound coils for producing pulsed magnetic fields in the 80 T range require very high strength of the construction materials. The copper-based conductors available today can hardly fulfil the required mechanical properties for the coil. Therefore, internal and external reinforcements with stronger materials are necessary. These reinforcements can be realised by solid cylinders or by fibre-wound composites. The advantage of fibre-wound composites is that they can be applied easily in different thickness and in any area of the coils. Zylon, Poly(p-phenylene-2,6-benzobisoxazole) or PBO fibre [1, 2], is a newly developed,
commercially available polymer material with extremely high ultimate tensile strength (UTS), high elastic modulus and good electrical insulation. Therefore, Zylon fibre is chosen as one of the candidates for internal reinforcement of high-field magnet coils.
The main mechanical properties at room temperature of the Zylon fibre, taken from the web site of its producer (http://www.toyobo.co.jp/e/seihin/kc/pbo), Toyobo Co. in Osaka, Japan,are listed in Table 1.
Zylon fibre will be wound and impregnated with epoxy when used as reinforcement
material in magnet coils. However, the information on the formation of Zylon/epoxy composite and its mechanical properties at room temperature as well as at liquid nitrogen temperature is not available. Therefore, a series of experiments, including the fabrication process of Zylon/epoxy composite, uni-axial tensile tests, transverse compressive tests and explo-vessel tests , have been carried out in this study.
Pages : 11
Size: 451 kb
Author : Y.K. Huang, P.H. Frings and E. Hennes
Mechanical properties of Zylon/epoxy composite