By J. T. Dickinson, S. C. Langford, L. C. Jensen (auth.), R. C. Bradt, D. P. H. Hasselman, D. Munz, M. Sakai, V. Ya. Shevchenko (eds.)
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Extra resources for Fracture Mechanics of Ceramics: Fracture Fundamentals, High-Temperature Deformation, Damage, and Design
Sample text
The time dependence of the current and phE during debonding may be due to changes in crack speed. 33 This is consistent with the relatively intense phE and the rapidly rising current immediately prior to the completion of interfacial failure. In the final stages of crack growth, the stress intensity at the crack tip should be quite high and the crack velocity correspondingly high. Some of the phE in these final stages may be due to electrical discharges, but we note that phE bursts were also observed at small jumps in current long before the completion of debonding.
17(a). As the rod is displaced, asperities on the epoxy surface deform, resisting the rod displacement and exerting this resistance via static friction. Locally, microscopic slip between the two surfaces eventually results, causing rapid variations Gittering) in the increasing shear stress as shown schematically in Fig. 17(b). Finally, a series of asperities slip, leading to a catastrophic "lunge" of the rod. Repositioning and new alignment of asperities on both the metal and epoxy surfaces results in the recapture of the moving rod before zero stress is reached and the cycle begins again.
8 (b) SEM micrograph of pure iron deformed at 20 K. There are found many cleaved surfaces of the crystal grains as the fracture. Time distributions of fracto-emission from sodium glass plates are in Fig. II, in which (a) was obtained during fracture process at RT. The emission does not have so high a peak intensity and ends in a short time. With the decrease of specimen temperature, however, the peak intensity increase and the decay time become longer as shown in Fig. 11 (b). This trend is more clear in the case of fused quartz as shown in Fig.