Rheology of discontinuous fiber arrays in elongation
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This paper presents a two-fluid shear cell model that may apply to the long-discontinuous-fiber melt system made from AS4 carbon/poly- ether- ketone- ketone. As a 370°C melt at rest, PEKK forms a thermotropic liquid crystal structure. An LDFMS extended in the direction of the fibers generates a magnified local shearing strain rate through relative fiber motion. The boundary between the LCP and isotropic fluids could be a function of the fiber volume fraction, the generated shear strain rate, and the nucleation strength of the fiber surface. The two-cell model shows some of the consequences of generating a two fluid system within the LDFMS. The experimental data in this paper demonstrate the LCP character of PEKK and the nucleation effects of the AS4 fibers.
author list (cited authors)
Creasy, T. S., & Advani, S. G.