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Criteria for Crack Branching in Cylindrical Rods: II, Flexure
Author(s) -
KIRCHNER H.P.,
CONWAY J.C.
Publication year - 1987
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1987.tb05662.x
Subject(s) - elongation , rod , materials science , tension (geology) , composite material , branching (polymer chemistry) , stress intensity factor , stress (linguistics) , mechanics , structural engineering , fracture mechanics , ultimate tensile strength , physics , medicine , linguistics , philosophy , alternative medicine , pathology , engineering
The angular and radial dependencies of the mirror‐mist and mist‐hackle boundaries predicted by the stress intensity criterion for crack branching were compared with those of experimentally determined boundaries in cylindrical specimens fractured in flexure. The analysis models the reduction of branching radii near the surface caused by reduced constraint and the elongation toward the neutral axis caused by the stress distribution except that it underestimates the elongation in a range of angles for specimens fractured at relatively low stresses. This difference is believed to result from changes in crack shape that are not accounted for in the analysis. As in the case of rectangular bars fractured in tension and flexure and cylindrical rods fractured in tension, the stress intensity criterion continues to provide better predictions than the Johnson and Holloway criterion.