Film Effects On Ductile/Brititle Behavior In Stress-Corrosion Cracking

Autor: Tong-Yi Zhang, Wu-Yang Chu, Ji-Mei Xiao
Rok vydání: 1995
Předmět:
Zdroj: MRS Proceedings. 409
ISSN: 1946-4274
0272-9172
DOI: 10.1557/proc-409-207
Popis: The present work analyzes the effects of a passive film formed during stress corrosion cracking on ductile/brittle fracture behavior, considering the interaction of a screw dislocation with a thin film-covered mode III crack under an applied remote load. Exact solutions are derived, and the results show that the crack stress field due to the applied load is enhanced by a harder film or abated by a softer film. The critical stress intensity factor for dislocation emission from the crack tip is greatly influenced by both the stiffness and thickness of the filn. A dislocation is more easily to be emitted from the crack tip if the covered film has a shear modulus larger than that of the substrate. The opposite is also true, i.e., a softer film makes dislocation emission more difficult. Both phenomena become more significant when the film thickness is smaller.
Databáze: OpenAIRE
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