Premium
SIZE EFFECTS AND A MEAN‐STRENGTH CRITERION FOR CERAMICS
Author(s) -
Bao Y.,
Jin Z.
Publication year - 1993
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1993.tb00122.x
Subject(s) - materials science , fracture toughness , stress (linguistics) , ceramic , toughness , critical distance , composite material , fracture (geology) , constant (computer programming) , mechanics , physics , computer science , philosophy , linguistics , sound power , sound (geography) , acoustics , programming language
On the basis of a large amount of research on the fracture behaviour of ceramics, a new failure criterion is advanced. It is pointed out that the rupture of structural ceramics is governed by the mean stress in a specific zone, rather than by the peak stress value. The size of the process zone was derived as a material constant, and reflects the relation between the toughness and the strength of the material. The results show that the critical maximum stress varies with the stress gradient: the steeper the stress gradient, the higher the critical peak stress. Different experiments concerning the size effect have been carried out and the reason for size effects has been explained by a mean strength theory.