COLE D M.Crack nucleation in polycrystalline ice.Cold Regions Science and Technology.1988.71-79Cole, D. (1988), Crack nucleation in polycrystalline ice, Cold Regions Science and Technology, 15 (1), 79-87.COLE D
The existence of load-induced cracks in polycrystalline S2 ice is investigated theoretically in terms of the pile-ups of grain boundary dislocations around grain triple points. The microstructural stresses due to the elastic anisotropy of ice crystals are taken into account. Considering a random ...
nucleationprecipitationsegregation/ polycrystalline Al 2O 3compositionA combination of techniques has been used to compare the compositional and microstructural characteristics of two commercially hot-pressed aluminas. Second-phase material containing Ni was observed in one material, mainly as small ...
The nucleation of cracks is generally recognized as the precursor to the macroscopic fracture of many brittle materials. In this paper, the existence of load-induced cracks in polycrystalline S2 ice is investigated theoretically in terms of the pile-ups of grain boundary dislocations around grain ...
from the crack tip and incipient evolution of plastic deformation during crack extension[31]. In the case of grain boundary fracture, the dynamics of dislocation emission can also result in the nucleation of nano-voids ahead of the main crack. With subsequent increases in the local stress the ...
www.nature.com/scientificreports OPEN Cleavages along {110} in bcc iron emit dislocations from the curved crack fronts Tomoaki Suzudo1*, Ken‑ichi Ebihara1, Tomohito Tsuru2,3,4 & Hideki Mori5 Body-centered-cubic (bcc) transition metals, such as α-Fe and W, cleave...
A mechanism for crack nucleation in saline ice is presented, by considering a planar array of hexagonal grains containing the brine pockets as a model of poly crystalline saline ice. It is shown through a thermodynamic analysis that important local stresses arise associated with the internal ...
(iv) the crack to grain boundary length ratios are statistically distributed rather than constant, and (v) crack nucleation is strongly influenced by the orientations of the grain boundaries with respect to the applied stress and by the grain boundary dislocation configurations (positive or negative...
crack nucleationaluminadigital image correlationintergranular thermal stressCrack nuclei in pure and Cr-doped aluminas with average grain size between 1.5 渭m and 3.6 urn have been studied using digital image correlation of optical images, to observe the interaction between microstructure, residual stress...
These findings contradict previous reports suggesting a sharp increase in crack nucleation at the kinetic transition is responsible for the layered cracking [83]. From the reconstructions given in Fig. 3, bands of lateral cracking are found at times mid-way through kinetic transitions. As exposure ...