Abstract
IT is difficult to compare the results of Stone and Dingwall1 with our own2 because they do not give details of the exact method of measurement and data analysis. They have, however, supplied us with one of their specimens, C4/1, of unidirectional Type II carbon fibre in an epoxy matrix with Vτ=0.60. We measured the acoustic emission using the apparatus described in our previous paper2, but with wedge type grips. The specimen was cyclically loaded with an amplitude of 1,000 kg of tensile load for 3 cycles, and for the fourth and fifth cycles a tensile load of 2,000 kg was employed. This load corresponds to approximately 50% UTS as used by Stone and Dingwall. The results are given in Table 1.
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References
Stone, D. E. W., and Dingwall, P. F., Nature Physical Science, 241, 68 (1973).
Kim, H. C., Ripper Neto, A. P., and Stephens, R. W. B., Nature Physical Science, 237, 78 (1972).
Dorey, S. F., Proc. IME, 123, 479 (1962).
Baker, A. A., and Cratchley, D., App. Mat. Res., 72 (April 1966).
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KIM, H., NETO, A. & STEPHENS, R. Reply by Kim, Ripper Neto and Stephens. Nature Physical Science 241, 69–70 (1973). https://doi.org/10.1038/physci241069a0
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DOI: https://doi.org/10.1038/physci241069a0
