Film effects on ductile/brittle behavior in stress-corrosion cracking
- Hong Kong Univ. of Science and Technology, Kowloon (Hong Kong)
- Beijing Univ. of Science and Technology (China). Dept. of Materials Physics
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 3 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 film. A dislocation is more easily 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.
- OSTI ID:
- 400624
- Report Number(s):
- CONF-951155-; ISBN 1-55899-312-6; TRN: IM9650%%29
- Resource Relation:
- Conference: Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 27 Nov - 1 Dec 1995; Other Information: PBD: 1996; Related Information: Is Part Of Fracture -- Instability dynamics, scaling, and ductile/brittle behavior; Selinger, R.L.B.; Fuller, E.R. Jr. [eds.] [National Inst. of Standards and Technology, Gaithersburg, MD (United States)]; Mecholsky, J.J. [ed.] [Univ. of Florida, Gainesville, FL (United States)]; Carlsson, A.E. [ed.] [Washington Univ., Saint Louis, MO (United States)]; PB: 420 p.; Materials Research Society symposium proceedings, Volume 409
- Country of Publication:
- United States
- Language:
- English
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