Analysis of thermomechanical cyclic behavior of unidirectional metal matrix composites

Date

1993-01-01

Author

Çöker, Demirkan
Nicholas, Theodore

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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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Citation Formats

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.