Prediction of process-induced void formation in anisotropic Fiber-reinforced autoclave composite parts

Abstract

A numerical methodology is proposed to predict void content and evolution during autoclave processing of thermoset prepregs. Starting with the initial prepreg void content, the void evolution model implements mechanisms for void compaction under the effect of the applied pressure, including Ideal Gas law compaction, and squeeze flow for single curvature geometries. Pressure variability in the prepreg stack due to interactions between applied autoclave pressure and anisotropic material response are considered and implemented. A parametric study is conducted to investigate the role of material anisotropy, initial void content, and applied autoclave pressure on void evolution during consolidation of prepregs on a tool with single curvatures. The ability of the model to predict pressure gradient through the thickness of the laminate and its impact on void evolution is discussed.

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Acknowledgements

This work is supported by Composites Automation, LLC and the United States Naval Air and Warfare Center under Prime Contract No. N68335-17-C-0093 administrated by Dr. Suresh G. Advani. The views, opinions and/or findings contained in this report are those of the author(s) and should not be construed as an official US Naval Air Warfare Center position, policy or decision unless so designated by other documentation. The authors also declare that they have no conflict of interest.

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Correspondence to Bamdad Barari.

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Barari, B., Simacek, P., Yarlagadda, S. et al. Prediction of process-induced void formation in anisotropic Fiber-reinforced autoclave composite parts. Int J Mater Form 13, 143–158 (2020). https://doi.org/10.1007/s12289-019-01477-4

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Keywords

  • Void prediction
  • Prepreg
  • Anisotropic prepreg
  • Laminate
  • Autoclave process