Dissipative Energies of Epoxy Cracking in Superconducting Magnets
Epoxy cracking in epoxy-impregnated superconducting magnets is caused by transverse shear stresses created by Lorentz forces. The dissipative energy of cracking can induce premature quenches in these magnets. Dissipative crack energies have been measured in a test coil; the maximum energy measured in the test coil was ~2 mJ.
KeywordsDissipative Energy Acoustic Emission Epoxy Matrix Energy Transducer Mechanical Disturbance
Unable to display preview. Download preview PDF.
- 2.E.S. Bobrov, J.E.C. Williams, and Y. Iwasa, Experimental and theoretical investigation of mechanical disturbances in epoxy-impregnated superrconducting coils. Part 2: Shear-stress-induced epoxy fracture as the principal source of premature quenches and training-Theoretical analysis, Cryogenics 25; 307 (1985).CrossRefGoogle Scholar
- 5.H. Fujita, E.S. Bobrov, and Y. Iwasa, Simultaneous measurements of energy release and acoustic emission due to cracking and frictional movement, in this volume. Also see Hiroyuki Fujita and Yukikazu Iwasa, High-resolution experimental techniques for cryomechanics—a study of mechanical behavior of materials at 4.2 K (to appear in Experimental Mechanics 1986.)Google Scholar