Transverse permeability of dry fiber preforms manufactured by automated fiber placement. (10th November 2017)

• Record Type: Journal Article
• Authors: Aziz, A.R.; Ali, M.A.; Zeng, X.; Umer, R.; Schubel, P.; Cantwell, W.J.
• Is Part Of: Composites science and technology. Volume 152(2017)
• Page Start: 57
• Page End: 67
• Publication Date: 2017-11-10
• Subjects: Modeling -- Automated fiber placement -- Layered structures -- Resin flow; Composite materials -- Periodicals; Composite materials; Fibrous composites; Periodicals; 620.118
• DOI: 10.1016/j.compscitech.2017.09.011
• Languages: English
• ISSNs: 0266-3538

Abstract

Abstract: This work presents a correlation between the transverse permeability of a preform and the process variability of the automated dry fiber placement manufacturing technique. In this study, an experimental and numerical analysis of the dry tape preform, with a focus on its through-thickness permeability, has been undertaken. Geometric models, containing flow channels of two different width dry tape carbon preforms, have been created in the TexGen modeller. A Computational Fluid Dynamics (CFD) simulation has been undertaken to obtain the predicted through-thickness permeability of the dry tape preform. A parametric study on the effect of different dry tape gap sizes on the permeability of the preform is presented. An in-situ compaction study, carried out in an X-CT machine, revealed that the gap sizes were irregular throughout the manufactured preforms. In addition, an experimental investigation of the through-thickness permeability, which is based on a saturated flow condition at a thickness corresponding to full vacuum pressure, is also presented. The permeability prediction based on the X-CT re-constructed geometric model has been validated using the experimental data. A further parametric study has revealed that the process variablity in automated dry fibre placement influences the through-thickness permeability by a factor of upto 5.