A micromechanics-based strength prediction methodology for notched metal matrix composites
An analytical micromechanics based strength prediction methodology was developed to predict failure of notched metal matrix composites. The stress-strain behavior and notched strength of two metal matrix composites, boron/aluminum (B/Al) and silicon-carbide/titanium (SCS-6/Ti-15-3), were predicted. The prediction methodology combines analytical techniques ranging from a three dimensional finite element analysis of a notched specimen to a micromechanical model of a single fiber. In the B/Al laminates, a fiber failure criteria based on the axial and shear stress in the fiber accurately predicted laminate failure for a variety of layups and notch-length to specimen-width ratios with both circular holes and sharp notches when matrix plasticity was included in the analysis. For the SCS-6/Ti-15-3 laminates, a fiber failure based on the axial stress in the fiber correlated well with experimental results for static and post fatigue residual strengths when fiber matrix debonding and matrix cracking were included in the analysis. The micromechanics based strength prediction methodology offers a direct approach to strength prediction by modeling behavior and damage on a constituent level, thus, explicitly including matrix nonlinearity, fiber matrix debonding, and matrix cracking.
- Research Organization:
- National Aeronautics and Space Administration, Hampton, VA (United States). Langley Research Center
- OSTI ID:
- 7047792
- Report Number(s):
- N-92-25963; NASA-TM--107616; NAS--1.15:107616; CONF-920339--; CNN: RTOP 763-23-41-85
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360603* -- Materials-- Properties
ALLOYS
ALUMINIUM ALLOYS
BORON ALLOYS
CARBIDES
CARBON COMPOUNDS
COMPOSITE MATERIALS
CRACKS
DEFORMATION
FAILURE MODE ANALYSIS
FATIGUE
FIBERS
FINITE ELEMENT METHOD
FORECASTING
LAYERS
MATERIALS
MATHEMATICAL MODELS
MATRIX MATERIALS
MECHANICAL PROPERTIES
NOTCHES
NUMERICAL SOLUTION
PLASTICITY
REINFORCED MATERIALS
SILICON CARBIDES
SILICON COMPOUNDS
STRAINS
STRESSES
SYSTEM FAILURE ANALYSIS
SYSTEMS ANALYSIS
TITANIUM ALLOYS