SECOND ANNUAL PROJECT REVIEW AND TECHNICAL REPORT 1 MAY 1966-30 APRIL 1967
MONSANTO RESEARCH CORP ST LOUIS MO
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The finite-element method was used to calculate the longitudinal stiffness of short fiber composites the instability of parallel edge cracks determined from the energy concept and the strength and inherent crack size obtained from the stability calculations Youngs modulus calculated for randomly oriented fibrous composites a mathematical approach proposed for calculating stress fields around interior cracks and invariant properties of a laminated composite derived from the transformation equations of the anisotropic moduli. The electron scanning microscope provided insight into fracture mechanics composites were improved by incorporating a flexible layer around the fiber polyacrylic acid reacted with ZnO to produce a high modulus, temperature- resistant matrix data obtained indicating silane couplers decrease water diffusion at the interface a decrease in fracture toughness associated with a change in crack propagation mechanism and the viscosity of aggregate suspensions described by the Mooney equation. Techniques were developed for whisker fiber classification strands of well-oriented whisker fibers made and fabricated into high performance composites x-ray diffraction techniques applied to measuring fiber orientation, property maps developed for short fiber composites short boron fibers encapsulated to make a pre-preg molding compound in bead form fiber-matrix dry mix molding explored and data obtained relating matrix properties to fatigue characteristics.
- Laminates and Composite Materials