Micromechanics for Fiber Volume Percent With a Photocure Vinyl Ester Composite.
Micromechanics for fiber volume percent (Vf) from 0.0Vfto 54.0Vfwere conducted using (3 mm long × 9 µm diameter) high-purity quartz fibers in a visible-light vinyl ester particulate-filled photocure resin. MTS fully articulated four-point bend fixtures were used with a 40 mm test span and 50 × 2 × 2 mm3sample dimensions. Specimens were tested following the combined modified ASTM standards for advanced ceramics ASTM-C-1161-94 and polymers ASTM-D-6272-00 for modulus, flexural strength, and yield strength. Experimental data provided reliable statistical support for the dominant fiber contribution expressed through the rule-of-mixtures theory as a valid representation of micromechanical physics. The rule-of-mixtures micromechanics described byVfcould explain 92, 85, and 78% of the variability related to modulus, flexural strength, and yield strength respectively. Statistically significant improvements with fiber addition began at 10.3Vffor modulus, 5.4Vffor flexural strength, and 10.3Vffor yield strength,p< 0.05. In addition, correlation matrix analysis was performed for all mechanical test data. An increase inVfcorrelated significantly with increases in modulus, flexural strength, and yield strength as measured by the four-point bending test,p< 10-10. All mechanical properties in turn correlated highly significantly with one another,p< 10-9.
Department of Biomedical Engineering, School of Engineering, University of Alabama at Birmingham, Birmingham, Alabama.
Richard C
RC
Petersen
Department of Biomedical Engineering, School of Engineering, University of Alabama at Birmingham, Birmingham, Alabama ; Department of Surgery, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama ; Division of Biomaterials, School of Dentistry, University of Alabama at Birmingham, Birmingham, Alabama.
Jack E
JE
Lemons
Department of Biomedical Engineering, School of Engineering, University of Alabama at Birmingham, Birmingham, Alabama ; Division of Biomaterials, School of Dentistry, University of Alabama at Birmingham, Birmingham, Alabama.
Michael S
MS
McCracken