Acoustic emission responses from cyclic loading of a nuclear graphite

Neighbour, Gareth B.; McEnaney, Brian and Phillips, Mike (1992). Acoustic emission responses from cyclic loading of a nuclear graphite. Carbon, 30(3) pp. 359–363.

DOI: https://doi.org/10.1016/0008-6223(92)90031-Q

Abstract

An analysis is presented of acoustic emission from samples of a nuclear graphite, IMI-24, subjected to three consecutive, load-unload cycles to 5, 10, and 15 MPa, in tension, compression, and flexure. On the first cycle, cumulative acoustic emission events in all loading modes increased progressively from zero stress. However, in subsequent cycles, acoustic emission recurred at stresses approaching, but less than, the previous peak stresses (i.e., a Felicity effect was observed rather than a Kaiser effect). A new parameter, the Recovery ratio, B, is proposed for characterizing the pattern of acoustic emission on cyclic loading of graphites.

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