Crack interactions and strength predictions in fibrous metal-matrix composites
Thesis/Dissertation
·
OSTI ID:6976848
The first part of this work presents a general and simple method of stress analysis in linear elastic media which contains randomly oriented cracks and complex crack configurations. The second part is concerned with strength prediction of notched, fibrous metal-matrix composite-plate specimens. The crack-interaction method evaluates stress intensity factors of these cracks and some features of the adjacent stress fields. It is based on a novel superposition scheme which considers a configuration of N cracks as N separate problems, each of which consists of a solitary crack in an infinite elastic medium, loaded by an unknown traction, induced by the applied external load and by mutual interaction with other cracks in the configuration. Experimental observations of deformation fields in notched, undirectionally reinforced metal-matrix plates have shown that these fields are dominated by discrete plastic zones that extend from the notch tip in the direction of the fiber. Here, a model of strength prediction that takes into account the plastic zone-induced stress is presented. Analytical predictions on various specimens of different notch geometries are found to be in agreement with those found by experiments and by finite-element analysis.
- Research Organization:
- Rensselaer Polytechnic Inst., Troy, NY (United States)
- OSTI ID:
- 6976848
- Country of Publication:
- United States
- Language:
- English
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