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A Systematic Characterization Approach for Vacuum Bag Only Prepregs towards an Accurate Process Design.

Muhammed H Arikan1,2, Fatih Eroglu1,2, Volkan Eskizeybek3

  • 1Integrated Manufacturing Technologies Research and Application Center, Sabanci University, Tuzla, Istanbul 34956, Turkey.

Materials (Basel, Switzerland)
|January 21, 2022
PubMed
Summary

This study presents a systematic material characterization method for Vacuum Bag Only (VBO) prepregs. This approach ensures robust VBO process design by providing essential data for process modeling and quality control in aerospace composite manufacturing.

Keywords:
prepregprocess modelingresin rheologythermal properties

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Area of Science:

  • Materials Science
  • Aerospace Engineering
  • Composite Manufacturing

Background:

  • Aerospace-grade composite parts require precise manufacturing processes.
  • Vacuum Bag Only (VBO) prepregs offer an efficient manufacturing route.
  • Process design, modeling, and validation are critical for VBO quality.

Purpose of the Study:

  • To introduce a systematic material characterization approach for VBO prepregs.
  • To integrate material properties with VBO process mechanisms (fluid flow, consolidation, heat transfer).
  • To provide essential material data for robust VBO process design and modeling.

Main Methods:

  • Characterization categorized into resin system, fiber architecture, and thermal behavior.
  • Empirical models developed for resin cure-kinetics, glass transition temperature, and viscosity.
  • X-ray tomography used to determine fiber architecture and air permeability.
  • Novel specimen preparation for experimental characterization of specific heat capacity and thermal conductivity.

Main Results:

  • Established empirical models for resin system properties.
  • Quantified fiber architecture and air permeability using X-ray tomography.
  • Experimentally determined thermal characteristics (specific heat capacity, thermal conductivity).
  • Integrated material data suitable for process modeling.

Conclusions:

  • A systematic characterization methodology for VBO prepregs has been successfully developed.
  • The approach effectively integrates material properties with critical process mechanisms.
  • This methodology provides the necessary data for robust and validated VBO process design in aerospace composite manufacturing.