Identification of the effect of typical curvatures encountered in RTM parts on localized permeability of fibrous preforms

Konstantopoulos, Spyridon; Hueber, Christian; Mühlbachler, Elisabeth; Schledjewski, Ralf

doi:10.1080/20550340.2016.1229829

Cited by 5 publications

(6 citation statements)

References 20 publications

(30 reference statements)

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“…Furthermore, some investigations on the influence of curvatures and resin-rich zones in RTM and Wet Compression Molding (WCM) processes were performed in the last years. [27][28][29][30] However, no experimental investigations regarding the impact of metal forming on the fluid flow in curved FMLs have been performed yet.…”

Section: Infiltration Behaviormentioning

confidence: 99%

Permeability and fabric compaction in forming of fiber metal laminates

Kruse

Poppe

Henning

et al. 2023

Journal of Composite Materials

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Significant fluid–structure interaction is present in fiber metal laminate forming with a low viscous matrix. A modular, process-inspired test setup is presented for one-dimensional saturated and unsaturated infiltration experiments for fiber metal laminates. Permeability measurements for different fabric orientations, fabric layers, and fiber volume contents show low scatter and good repeatability for fiber volume contents up to 65%. Fiber metal laminate specimens were formed by exchanging the mid-segment of the test setup with a punch and die. The stiffness differences between metal and fabric lead to remarkably high compactions in the bending radii, significantly reducing the flow during infiltration. Contrary to resin transfer molding processes, no formation of resin-rich zones along bending edges occurs due to the high normal pressures from metal forming. A numerical forming simulation was developed to predict the local fiber volume content. Comparing the experimental results with the numerical simulation shows that the high fiber volume content in the radii almost exclusively impacts the overall permeability. Implications for fiber metal laminate processing and modeling are outlined.

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Section: Infiltration Behaviormentioning

confidence: 99%

Permeability and fabric compaction in forming of fiber metal laminates

Kruse

Poppe

Henning

et al. 2023

Journal of Composite Materials

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“…Both saturated and unsaturated flow tracking was reported in some of these works. Based on experimental data, neural networks have also been trained to predict permeability from input parameters (fabric type, porosity, input pressure) [6,7].…”

Section: An Inverse Methods For Determining Fabric Permeability In Va...mentioning

confidence: 99%

An Inverse method for determining fabric permeability in vacuum assisted resin infusion for composite parts forming

Vosniakos

2023

Materials Research Proceedings

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Abstract. Vacuum Assisted Resin Infusion (VARI) method employs a mould on top of which a number of fabric pieces are laid up and impregnated by resin drawn through vacuum. Simulation of VARI depends on the determination of fabric permeability. In this work, permeability value is selected from a set of discrete values by a genetic algorithm. An impregnation simulation model is run on ComsolTM to compute the flow front propagation inside the fabric. The genetic algorithm compares the evolution (propagation) of the impregnation front, in a space and time dimension, with the corresponding result of one single actual impregnation experiment, obtained by machine vision. A simple part suffices for this experiment assuming homogenous fabric porosity. The computational cost of the method is low, making it superior to experimental determination of permeability on expensive custom-made devices.

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“…Project APOLLO is part of a three column concept for increased production efficiency in aerospace composite industry (Hueber and Schledjewski 2018). Autoclave production planning (APOLLO (Hueber, Fischer, and Schledjewski 2017)) together with continues cost estimation (ALPHA (Hueber, Horejsi, and Schledjewski 2016a;Hueber, Horejsi, and Schledjewski 2016b)) and process optimisation (ARTEMIS (Konstantopoulos et al 2016;) are considered key factors for improving production economic.…”

Section: Introductionmentioning

confidence: 99%

Production planning optimisation for composite aerospace manufacturing

Hueber

Fischer

Schwingshandl

et al. 2018

International Journal of Production Research

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Composite materials proved highly successful for aerospace applications in the last decades, but increased cost pressure forces the composite industry to become more efficient. This requires new manufacturing technologies and optimised processes as raw material costs and labour costs are basically fixed when wanting to keep production on site. Probably the most defining process for aerospace composite production is manual layup of prepreg material with subsequent curing in an autoclave. From production planning view, this combination poses the challenge of transition from discrete layup manufacturing to batch curing processing with the restriction of limited allowed storage time of the prepreg material prior to cure. In this paper, a new approach for production order optimisation at the conjunction of discrete and batch processing is presented. The APOLLO named tool is designed to decrease throughput times, streamline production and increase autoclave utilisation in the composite aerospace industry.

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Identification of the effect of typical curvatures encountered in RTM parts on localized permeability of fibrous preforms

Cited by 5 publications

References 20 publications

Permeability and fabric compaction in forming of fiber metal laminates

Permeability and fabric compaction in forming of fiber metal laminates

An Inverse method for determining fabric permeability in vacuum assisted resin infusion for composite parts forming

Production planning optimisation for composite aerospace manufacturing

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