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Correlation of CLASS II - CFCC Damage Models with Experimental Data
The following correlations are available for viewing:
Tensile
Response of a Uni-Directional SiC/SiC Composite
Axial Stress-Strain Curve for Uni-Directional Nicalon/LASII
Defining criteria:
- Fiber/matrix debonding strength = 172 MPa (25 ksi),
- Fiber/matrix interfacial friction stress = 3 MPa (0.44 ksi),
- Fiber volume fraction = 46%,
- Fiber scale (Weibull) parameter = 1738 MPa (252 ksi),
- Fiber shape (Weibull) parameter = 2.7
- Curve 1 shows experimental data in addition to
predicted behavior using both statistically distributed and constant fiber
strength values.
- Curve 2 shows experimental data and the predicted
stress-strain and modulus behavior using the statistically distributed fiber
strength model.
- Curve 3 shows experimental data and the predicted
stress-strain and crack density behavior using the statistically distributed
fiber strength model.
Uni-Directional Nicalon/CAS
Defining criteria:
- Fiber/matrix debonding strength = 138 MPa (20 ksi),
- Fiber/matrix interfacial friction stress = 1.38 MPa (0.2 ksi),
- Initial matrix stress = 172 MPa (25 ksi),
- Matrix crack saturation stress = 344 MPa (50 ksi),
- Fiber scale (Weibull) parameter = 1171 MPa (170 ksi) for curve 1,
- Fiber shape (Weibull) parameter = 2.0
- Curve 1 shows experimental data in addition to
predicted behavior using both statistically distributed and constant fiber
strength values.
- Curve 2 shows experimental data and the predicted
stress-strain behavior using the statistically distributed fiber strength
model for a range of fiber scale parameters.
Uni-Directional
Nicalon/CAS, Volume Fraction=40%
Defining criteria:
- Fiber/matrix debonding strength = 138 MPa (20 ksi),
- Fiber/matrix interfacial friction stress = 1.38 MPa (0.2 ksi),
- Initial matrix stress = 172 MPa (25 ksi),
- Matrix crack saturation stress = 344 MPa (50 ksi),
- Fiber scale (Weibull) parameter = 1171 MPa (170 ksi),
- Fiber shape (Weibull) parameter = 1 - 20.
Sensitivity
of Predictions to Initial Matrix Strength
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