Glass Fiber Reinforced Plastics for Cryogenic Use: Improvement of Thermal Contraction and Elastic Modulus in Thickness Direction
The thermal contraction down to cryogenic temperatures and compressive modulus in thickness direction of laminates have been improved aiming at the practical application to the large scale superconducting magnets. The properties in thickness direction are usually inferior to those in in-plane direction because they are mainly controlled by the matrix of the composites. The improvement of the characteristics in the thickness direction was tried by means of either the use of filled matrix or the increase of volume fraction of glass fibers. Several kinds of fillers were evaluated changing the size, shape and distribution of size. The thermal and mechanical properties of the filled epoxies were examined to decide the desirable filled matrix. The volume fraction of glass fibers was also increased up to 65%. The compressive modulus and the thermal contraction of the improved GFRP in thickness direction was confirmed to show 0.3% and 18GPa, respectively.
KeywordsCompressive Strength Thickness Direction Filler Content Compressive Modulus Glass Fiber Reinforce Plastic
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- 1.Y.Nakamura, A. Nagao, N. Hiraki and S. Itoh, Reliable and stable operation on the high field superconducting Tokamak TRIAM-1M, Proc. 11th Int. conf. Magn. Technol. 767 (1989)Google Scholar
- 2.Y. Tsuda, K. Toyoda, T. Hirayama et. al., First construction of superconducting helical coil for feasibility study of large helical coil, Proc. 11th Int. conf. Magn. Technol. 789 (1989)Google Scholar
- 3.Y. Hattori, K. Yoshida, H. Nakajima et.al., Measurement of winding rgidity on superconducting coil for fusion magnet design, Proc. 9th Int. conf. Magn. Technol. 371 (1985)Google Scholar
- 4.K. Fukushi, M. Nagai, Y. Kamata and K. Kadokawa, Mechanical properties of low contraction GFRP, in: “Nonmetallic Materials and Composites at Low Temperatures 3” Plenum Press, New York (1986)Google Scholar
- 5.H. Okuyama, S. Nishijima, T. Okada et. al., Compressive behavior of three dimensional fabric reinforced plastics at cryogenic temperature, Adv. Cryog. Eng. 36B: 901 (1990)Google Scholar
- 7.S. Nishijima, T. Okada, P.C. Michael et. al., Friction and wear of a Three-dimensional fabric-reinforced plastics at room temperature and liquid nitrogen temperature, Adv. Cryog. Eng. 38A: 429 (1992)Google Scholar
- 8.B. Turck, Tore Supra: A Tokamak with superconducting toroidal field coils status report after first plasmas, IEEE Trans. Magn. MAG25; 1473 (1989)Google Scholar