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Heat generation from epoxy cracks and bond failures |
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| Authors: | H. Maeda Y. Iwasa |
| Affiliation: | 1. Francis Bitter National Magnet Laboratory, Massachusetts Institute of Technology Cambridge, Massachusetts 02139, USA;2. Toshiba Research and Development Centre Kawasaki, Kanagama, Japan;3. Department of Mechanical Engineering, M.I.T. Kanagama, Japan |
| Abstract: | Energy released following cracks and bond failures were measured for an EPON epoxy near 4.2 K. Crack events were monitored with an acoustic emission sensor; the energy released by each crack or bond failure was calculated from the temperature rise measured with thermocouples. Cracking was observed to be load dependent; this may account in part for the training phenomenon observed in bringing epoxy-impregnated superconducting magnets to full design field. |
| Keywords: | epoxy resins acoustic emission superconducting magnet |
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