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Strength‐Processing Defects Relationship Based on Micrographic Analysis and Fracture Mechanics in Alumina Ceramics
Author(s) -
Nakamura Satoshi,
Tanaka Satoshi,
Kato Zenji,
Uematsu Keizo
Publication year - 2009
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.1551-2916.2008.02904.x
Subject(s) - materials science , weibull distribution , weibull modulus , composite material , ceramic , fracture mechanics , fracture (geology) , modulus , flexural strength , size effect on structural strength , characterization (materials science) , strength of materials , mathematics , nanotechnology , statistics
Characterization of processing defects in structural ceramics is very important for the investigation of mechanical property, because processing defects are origin of fracture and govern the strength of products. The relationship between defects and strength is represented by simple equation which contains factor of defect size. In this study, size of defects in alumina ceramics was measured by optical microscopy with sintered body thinned to about 150 μm. The size distribution was used for strength calculation based on linear fracture mechanics. Average and Weibull modulus of calculated strength were very agreed with experimentally measured them. The result shows that defects in sintered body govern the strength and are quantitatively related to strength by fracture mechanics.