Effective permeability averaging scheme to address in-plane anisotropy effects in multi-layered preforms. (October 2018)

• Record Type: Journal Article
• Authors: Bancora, S.P.; Binetruy, C.; Advani, S.G.; Syerko, E.; Comas-Cardona, S.
• Is Part Of: Composites. Volume 113(2018)
• Page Start: 359
• Page End: 369
• Publication Date: 2018-10
• Subjects: A. Layered structures -- B. Permeability -- C. Process modeling -- E. Liquid composite moulding; Composite materials -- Periodicals; Manufacturing processes -- Periodicals; Composite materials; Manufacturing processes; Periodicals; 620.11805
• DOI: 10.1016/j.compositesa.2018.07.025
• Languages: English
• ISSNs: 1359-835X

Abstract

Abstract: 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 However, there are situations in which the through-thickness flow is significant where this assumption is no longer valid or justified.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.