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Influence of Microstructure on Crack Propagation in ZnSe
Author(s) -
FREIMAN S. W.,
MECHOLSKY JOHN J.,
RICE ROY W.,
WURST J. C.
Publication year - 1975
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.1151-2916.1975.tb19009.x
Subject(s) - crystallite , microstructure , materials science , fracture mechanics , stress intensity factor , flexural strength , composite material , fracture (geology) , intensity (physics) , stress (linguistics) , grain size , mineralogy , metallurgy , optics , chemistry , physics , linguistics , philosophy
The rate of crack propagation as a function of the stress intensity factor, K 1 , for chemically vapor‐deposited (CVD) ZnSe was significantly larger in H 2 O than in air. Lower flexural strengths were measured in H 2 O (29 MN/m 2 ) than in air (40 MN/m 2 ). Fracture surface analysis of these flexural specimens showed that failure usually resulted from flaws contained within 1 or 2 large grains. These flaws were shown to propagate at a stress‐intensity factor of 0.33 MN/m 3/2 compared to the measured value of 0.70 MN/m 3/2 for polycrystalline ZnSe. Fracture mechanics parameters obtained in the present study were used to show that failure time predictions using values of K 1C for propagation through a single grain are 25 times shorter, and proof‐to‐service stress ratios are 1.1 times greater, than those obtained for polycrystalline ZnSe.