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Analysis of thermomechanical cyclic behavior of unidirectional metal matrix composites
Date
1993-01-01
Author
Çöker, Demirkan
Nicholas, Theodore
Metadata
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An analytical tool is developed to determine the three-dimensional stress state in a unidirectional composite subjected to axial loading and changes in temperature. A finite difference method is used to analyze a representative volume element of the composite which consists of concentric cylinders. The constituents are assumed to be elastic-plastic materials having temperature dependent properties. An iterative technique using the Prandtl-Reuss flow rule to determine incremental plastic strains is implemented in a computer code capable of predicting the axisymmetric triaxial stresses in a composite under thermomechanical fatigue (TMF) loading conditions. The model is verified with finite element method calculations for the problem of thermal residual stresses resulting from cool-down from the processing temperature. Results for several TMF loading conditions are compared with experimental data and 1-D predictions for a SCS-6 silicon carbide fiber and Ti-24Al-11Nb matrix composite. Significant differences are noted between results based on 1-D and 3-D approximations to the stress state in a composite and are discussed in detail.
Subject Keywords
Dynamic loads
,
Finite element method
,
Iterative methods
,
Mathematical models
,
Metallic matrix composites
,
Silicon carbide
,
Plasticity
,
Strain
,
Stresses
,
Synthetic fibers
,
Thermal effects
,
Titanium alloys
URI
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0027211598&origin=inward
https://hdl.handle.net/11511/73906
Conference Name
Symposium on Thermomechanical Fatigue Behavior of Materials (1991)
Collections
Department of Aerospace Engineering, Conference / Seminar
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D. Çöker and T. Nicholas, “Analysis of thermomechanical cyclic behavior of unidirectional metal matrix composites,” San Diego, California, Amerika Birleşik Devletleri, 1993, p. 50, Accessed: 00, 2021. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0027211598&origin=inward.