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Fracture of Brittle Materials under a Simulated Wear Stress System
Author(s) -
Rosenfield Alan R.
Publication year - 1989
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.1151-2916.1989.tb06041.x
Subject(s) - materials science , fracture toughness , composite material , rubbing , brittleness , crack growth resistance curve , fracture (geology) , fracture mechanics , shear (geology) , crack closure , stress (linguistics) , toughness , structural engineering , engineering , linguistics , philosophy
Currently no data are available for fracture toughnesses associated with the compression/shear (mixed mode) stress distribution of the sliding‐wear loading system. To provide such information, diametrically compressed disk specimens of electrical porcelain were tested and used to develop a fracture criterion for a body containing a crack which is subjected to mixed‐mode loading. The role of applied shear loads in creating local tensile stresses near the crack tip is discussed. While these stresses are embodied in the maximum‐hoop‐stress theory of mixed‐mode fracture, it was found that the toughness values had only a fair fit with theory. However, the direction of initial crack growth, which is out‐of‐plane, is consistent with theory. Since effects due to crack‐face rubbing were limited by using a finite‐thickness notch in the test specimen (instead of a crack), the data, although indicative, are not fully representative of debris formation during sliding wear. The paper concludes with the formulation of a simple model of the formation of a debris particle.