Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10425421 | Composites Science and Technology | 2005 | 13 Pages |
Abstract
A molten hybrid-yarn composite is modelled as a continuum. Constitutive equations governing hydrostatic consolidation are formulated, based on a two-phase continuum mechanical framework developed in a recent paper [Larsson R, Wysocki M, Toll S. Process-modelling of composites using two-phase porous media theory. European Journal of Mechanics-A 2004;23:15-36]. The fibre bundles are assumed to be completely surrounded by resin, thus subjected to hydrostatic pressure. To model the infiltration of resin into the fibre bundles, we introduce a compressible solid phase consisting of fibres plus intra-fibre void. The compression of the solid phase is caused by a combination of infiltration and elastic compression of the fibre bundles. The models are micromechanical, and all parameters have a clear physical meaning and are measurable in principle. Using parameter values out of the literature and estimated from micrographs, the number of adjustable parameters may be brought down to one: a spring constant for the fibre bundle elasticity. Consolidation experiments are performed, where a tool is closed to a prescribed compression and then held fixed, while the pressure is monitored over time. The predicted and measured pressure traces are in good agreement.
Related Topics
Physical Sciences and Engineering
Engineering
Engineering (General)
Authors
Maciej Wysocki, Ragnar Larsson, Staffan Toll,