Behavior of acoustic emission caused by microfracture in polycrystalline graphites

Room temperature long-term creep/relaxation behaviour of carbon cathode material

“…Burchell et al [33] have proposed that the low energy AE events were related to basal plane cleavage and subcritical cracking, occurring in the most favourably aligned basal planes, while the high energy AE events were associated with cracking, starting in the less favourably aligned basal planes and then extending into the binder phase. Ioka et al [32] have proposed similar explanations, by relating the AE energy to the surface energy of the carbon structure (C-C, double C-C, van der Waals). Based on their results, they have proposed that at low stress levels, the deformation could be linked to the cleavage and slip of basal planes in the filler particles, plus microcracks initiation in the binder, while at high stresses, the deformation is related to the cleavage and microcracks propagation in the binder.…”

“…Burchell et al [33], followed by Ioka et al [32], observed two different types of AE, both created under tensile and compression loading, on different grades of polygranular graphite. Burchell et al [33] have proposed that the low energy AE events were related to basal plane cleavage and subcritical cracking, occurring in the most favourably aligned basal planes, while the high energy AE events were associated with cracking, starting in the less favourably aligned basal planes and then extending into the binder phase.…”

“…Several authors [30,[32][33][34] have used acoustic emission (AE) as a monitoring tool to study the deformation and fracture of the carbon material at ambient temperature. Acoustic emissions can result from the deformation of solids due to dislocations, debonding, cleavage and cracking [32].…”

“…Acoustic emissions can result from the deformation of solids due to dislocations, debonding, cleavage and cracking [32].…”