The Viscosity and Tensile Properties of Mixed Fiber/Bead Reinforced Plastics
Abstract
The rheological and mechanical properties of composites containing mixtures of fibrous and particulate reinforcements were measured at 15 vol % total reinforcement. Suspensions of glass beads and fibers in nearly Newtonian silicone oils are highly pseudoplastic in the shear rate range 2.6 to 520/sec. They exhibit no capillary exit die swell, but show large rod climbing (Weissenberg) effects. The moduli and tensile strength of random, two- dimensional, glass bead/glass fiber/polycarbonate composites are approximately linear in the fraction of filler which is fibers. Tensile elongation at break falls off rapidly with substitution of a small amount of fibers. A number of theories for the modulus of mixed reinforced systems are examined. An index of processability/mechanical properties trade-off is developed in order to determine the degree to which substitution of bead filler for fibers in fiber reinforced plastics might enhance processability without undue sacrifice of properties.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1974
- Accession Number
- ADA005989
Entities
People
- Christopher T. Hill
- Keith D. Roberts
Organizations
- Monsanto