Role of interfacial and matrix creep during thermal cycling of continuous fiber reinforced metal-matrix composites
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Authors
Dutta, I.
Subjects
Composites
Thermal cycling
Interfaces
Creep
Modeling
Thermal cycling
Interfaces
Creep
Modeling
Advisors
Date of Issue
1999-10-21
Date
Publisher
Published by Elsevier Science Ltd (Pergamon) on behalf of Acta Metallurgica Inc.
Language
Abstract
A uni-dimensional micro-mechanical model for thermal cycling of continuous fiber reinforced metal-matrix composites is developed. The model treats the fiber and matrix as thermo-elastic and thermo-elasto-plastic-creeping solids, respectively, and allows the operation of multiple matrix creep mechanisms at various stages of deformation through the use of unified creep laws. It also incorporates the effect of inter-facial sliding by an interface-diffusion-controlled diffusional creep mechanism proposed earlier (Funn and Dutta, Acta mater., 1999, 47, 149). The results of thermal cycling simulations based on a graphite fiber re-inforced pure aluminum-matrix composite were compared with experimental data on a P100 graphite-6061 Al composite. The model successfully captured all the important features of the observed strain responses of the composite for different experimental conditions, such as the observed heating/cooling rate dependence, strain hysteresis, residual permanent strain at the end of a cycle, as well as both intrusion and protrusion of the fiber-ends relative to the matrix at the completion of cycling. The analysis showed that the dominant deformation mechanism operative in the matrix changes continually during thermal cycling
due to continuous stress and temperature revision. Based on these results, a framework for the construction of a transient deformation mechanism map for thermal excursions of continuous fiber composites is
proposed.
Type
Article
Description
(Received 9 August 1999; accepted 21 October 1999)
Series/Report No
Department
Mechanical Engineering (ME)
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
National Science Foundation, Division of Materials Research, under contract number DMR-9423668
Funder
Format
20 p.
Citation
I. Dutta "Role of interfacial and matrix creep during thermal cycling of continuous fiber reinforced metal-matrix composites." Acta Materialia 48 (2000) 1055-1074.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.