Reduction of thermal residual stresses in advanced metallic composites based upon a compensating/compliant layer concept
- NASA, Lewis Research Center, Cleveland, OH (United States) Toledo, University, OH (United States)
A detailed parametric study is carried out to investigate the viability of the recently proposed compensating/compliant layer concept (i.e., the insertion of an interface material between SiC fiber and metal matrix to reduce or eliminate the residual stress buildup during cooling of the composite). The study uses a finite-element concentric cylinder model with generalized plane strain end conditions and free boundary conditions, assuming the SiC fiber to be isotropic and linear elastic and the compliant layer cylinder and matrix (Ti3Al + Nb) cylinder to be isotropic and bilinear elastic-plastic. Results show that a compensating/compliant layer acts to reduce in-plane residual stresses within the fiber and the matrix and, therefore, reduces radial cracking. However, this decrease in in-plane stresses is accompanied by an increase of longitudinal stress, which may initiate longitudinal cracking. 16 refs.
- OSTI ID:
- 7162433
- Journal Information:
- Journal of Composite Materials; (United States), Vol. 26:9; ISSN 0021-9983
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM ALLOYS
RESIDUAL STRESSES
THERMAL STRESSES
COMPOSITE MATERIALS
NIOBIUM
SILICON CARBIDES
TITANIUM ALLOYS
BOUNDARY CONDITIONS
COOLING
CRACK PROPAGATION
FINITE ELEMENT METHOD
INTERFACES
INTERMETALLIC COMPOUNDS
MATHEMATICAL MODELS
MATRIX MATERIALS
METALS
MITIGATION
PARAMETRIC ANALYSIS
REINFORCED MATERIALS
THERMAL EXPANSION
ALLOYS
CARBIDES
CARBON COMPOUNDS
ELEMENTS
EXPANSION
MATERIALS
NUMERICAL SOLUTION
SILICON COMPOUNDS
STRESSES
TRANSITION ELEMENTS
360603* - Materials- Properties