Micromechanics of creep deformation of two-phase composites and porous materials
Thesis/Dissertation
·
OSTI ID:5398331
A local-field theory and a mean-field theory are developed to predict the transient creep behavior of a metal-matrix composite with unidirectionally aligned and randomly oriented inclusions, respectively. The matrix and inclusion phases may both undergo the primary and the secondary creep, where the creep rate depends nonlinearly on the stress. The proposed method is based upon Eshelby's inclusion theory, Mori-Tanaka's mean-field theory, and Luo and Weng's local solution of a three-phase cylindrically concentric solid. While the local theory can be used to a somewhat higher concentration, the mean-field one is suitable only for a composite with low-volume fraction of inclusions. The theoretical predictions are found to be in reasonable agreement with the experimental data. With this newly developed theory in the Laplace space, the nature of void growth for the general class of linear viscoelastic matrix is studied at a non-dilute concentration range.
- Research Organization:
- Rutgers--the State Univ., New Brunswick, NJ (United States)
- OSTI ID:
- 5398331
- Country of Publication:
- United States
- Language:
- English
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