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Criterion for the Avoidance of Edge Cracking in Layered Systems
Author(s) -
He M. Y.,
Evans A. G.,
Yehle A.
Publication year - 2004
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.1551-2916.2004.01418.x
Subject(s) - brittleness , equating , toughness , materials science , tension (geology) , cracking , thermal expansion , stress (linguistics) , plane (geometry) , enhanced data rates for gsm evolution , composite material , strain energy release rate , fabrication , compression (physics) , thermal , fracture toughness , structural engineering , geometry , mathematics , computer science , thermodynamics , physics , engineering , medicine , telecommunications , linguistics , statistics , philosophy , alternative medicine , pathology , rasch model
When fabricating multilayers with brittle constituents, a prevalent design strategy is to choose fabrication conditions and thermal expansion coefficients that impose in‐plane compression on the brittle layers. In such designs, a small zone of out‐of‐plane tension is induced at the edges that can cause cracks to form and extend, especially along the midplane. The associated stresses and energy release rates have been analyzed, revealing a fail‐safe criterion , attributed to the existence of a maximum possible energy release rate, G max . Equating this maximum to the toughness defines a fail‐safe parameter expressing the influence of the layer thickness, the misfit stress, and the toughness. When fail‐safe designs cannot be realized, thin interlayers can be interposed in a manner that diminishes G max , broadening accessibility. The roles of misfit stress and interlayer thickness in attaining this condition are derived.