Effective permeability averaging scheme to address in-plane anisotropy effects in multi-layered preforms
| Autor: | Suresh G. Advani, S. Bancora, Christophe Binetruy, Elena Syerko, Sébastien Comas-Cardona |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Flow (psychology) Physics::Optics 02 engineering and technology Molding (process) Mechanics 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Transverse plane Permeability (earth sciences) Stack (abstract data type) Mechanics of Materials Ceramics and Composites Composite material 0210 nano-technology Relative permeability Anisotropy Parametric statistics |
| Zdroj: | Composites Part A: Applied Science and Manufacturing. 113:359-369 |
| ISSN: | 1359-835X |
| Popis: | In Liquid Composite Molding (LCM) processes, fabric layers are stacked in a mold which may be a few meters long and wide to build up a thickness of not more than a few millimeters. Resin is introduced to fill all the empty spaces between the fibers. As the in plane dimensions are a few orders of magnitude larger than through the thickness, flow of resin through the preform can be modeled using the two-dimensional Darcy’s law, neglecting the through-thickness velocity and assigning the preform an arithmetic averaged permeability from the layers. However, there are situations in which the through-thickness flow is significant where this assumption is no longer valid or justified. To address such cases, a modified averaging scheme was proposed by Calado and Advani (1996) to account for the transverse flow between adjacent layers of a preform and consequently derive an homogenized one-dimensional value of effective permeability. In the current work, such a model is extended to account for the effect of anisotropic off-axis layers in the stack. The result is a generalized scheme for effective permeability averaging layers of heterogeneous preforms, capturing both through-thickness and in-plane effects into a one-dimensional permeability value. This methodology was validated and a parametric study was conducted with different combinations of in-plane and through-thickness permeability values to identify the influence of preform in-plane dimensions and thickness and to define a criteria that relates the material and geometric parameters to the transverse flow. |
| Databáze: | OpenAIRE |
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