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Experimental study of the effects of the fiber-bed pre-conditioning on permeability measurements
CRTM is a manufacturing technique used by BMW for the production of the CFRP frames of the BMW i3 and i8 series. In this process, the resin is pressed into the textile in through-thickness direction. At CMASLab, we are investigating this type of process and developing new methods for the characterization of the relevant material parameters. In the study of the through-thickness textile permeability, the compaction behavior of the fiber bed has a great influence on the flow behavior
Within this thesis, we aim to develop a procedure which should permit to increase the reproducibility of the experiments and the predictability of the fiber bed compaction behavior, to allow a more accurate and robust characterization of the through-thickness textile permeability. In order to address this challenge we need to:
•Design a setup for pre-conditioning of the fiber samples (pneumatic compaction machine)
•Assess the influence of the fiber rearrangement by performing flow experiment at low injection pressure before and after pre-conditioning.
•Study the reproducibility of the experiment by measuring the flow-rate at high injection pressure for different samples
•Identify the best pre-conditioning strategy to improve the characteristics of the textile sample.
Within this thesis, we aim to develop a procedure which should permit to increase the reproducibility of the experiments and the predictability of the fiber bed compaction behavior, to allow a more accurate and robust characterization of the through-thickness textile permeability. In order to address this challenge we need to: •Design a setup for pre-conditioning of the fiber samples (pneumatic compaction machine) •Assess the influence of the fiber rearrangement by performing flow experiment at low injection pressure before and after pre-conditioning. •Study the reproducibility of the experiment by measuring the flow-rate at high injection pressure for different samples •Identify the best pre-conditioning strategy to improve the characteristics of the textile sample.
The overall objective of this thesis is to perform through-thickness flow experiments and quantify the effect of the compaction history on the flow behavior of a textile preform. Textiles with different characteristics will be tested under varying conditions (pressure, fluid viscosity, compaction pre-condition).
The overall objective of this thesis is to perform through-thickness flow experiments and quantify the effect of the compaction history on the flow behavior of a textile preform. Textiles with different characteristics will be tested under varying conditions (pressure, fluid viscosity, compaction pre-condition).
Ayyoub Kabachi
ETH Zurich
Institute of Design, Materials and Fabrication
LEE O 225
Leonhardstrasse 21, 8092 Zürich
Phone: +41 44 633 64 07
mkabachi@ethz.ch
www.structures.ethz.ch
Ayyoub Kabachi ETH Zurich Institute of Design, Materials and Fabrication LEE O 225 Leonhardstrasse 21, 8092 Zürich Phone: +41 44 633 64 07 mkabachi@ethz.ch www.structures.ethz.ch