Damage mechanisms in composites. Final technical report
Mechanically induced residual stresses are an inherent feature of permanently deformed metal-matrix composites such as aluminum silicon carbide. The presence of hard SiC reinforcements promotes non homogeneous flow in the matrix, resulting in residual stresses when the applied loads are removed. These residual stresses are potentially important because of the effect on cavitation and other damage mechanisms leading to composite failure. The authors have attempted to simulate the residual stresses in the composite by solving appropriate boundary value problems using finite element method. Using this approach, they have compared predicted average residual elastic strains with those measured by neutron diffraction for Al SiC composites subjected to different loading histories. The composite studied was a 2009 aluminum alloy reinforced with 15% vol SiC whiskers. Samples were subjected to various levels of plastic strain and unloaded before measuring peak shifts in neutron diffraction patterns to determine residual strains.
- Research Organization:
- Brown Univ., Providence, RI (United States). Div. of Engineering
- OSTI ID:
- 5838236
- Report Number(s):
- AD-A-242748/2/XAB; CNN: N00014-86-K-0125
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360603* -- Materials-- Properties
ALLOYS
ALUMINIUM ALLOYS
BOUNDARY-VALUE PROBLEMS
CARBIDES
CARBON COMPOUNDS
CAVITATION
COHERENT SCATTERING
COMPARATIVE EVALUATIONS
COMPOSITE MATERIALS
CRYSTALS
DAMAGE
DEFORMATION
DIFFRACTION
ELASTICITY
EVALUATION
FINITE ELEMENT METHOD
MATERIALS
MATRIX MATERIALS
MECHANICAL PROPERTIES
MONOCRYSTALS
NEUTRON DIFFRACTION
NUMERICAL SOLUTION
PLASTICITY
RESIDUAL STRESSES
SCATTERING
SILICON CARBIDES
SILICON COMPOUNDS
STRAINS
STRESSES
TENSILE PROPERTIES
WHISKERS