Pressurized Infusion: A New and Improved Liquid Composite Molding Process


Akif Yalcinkaya M., Guloglu G. E. , Pishvar M., Amirkhosravi M., Murat Sozer E., Cengiz Altan M.

Journal of Manufacturing Science and Engineering, Transactions of the ASME, vol.141, no.1, 2019 (Journal Indexed in SCI Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 141 Issue: 1
  • Publication Date: 2019
  • Doi Number: 10.1115/1.4041569
  • Title of Journal : Journal of Manufacturing Science and Engineering, Transactions of the ASME
  • Keywords: composites manufacturing, mechanical properties, permeability, voids

Abstract

© 2019 by ASME.Vacuum-assisted resin transfer molding (VARTM) has several inherent shortcomings such as long mold filling times, low fiber volume fraction, and high void content in fabricated laminates. These problems in VARTM mainly arise from the limited compaction of the laminate and low resin pressure. Pressurized infusion (PI) molding introduced in this paper overcomes these disadvantages by (i) applying high compaction pressure on the laminate by an external pressure chamber placed on the mold and (ii) increasing the resin pressure by pressurizing the inlet resin reservoir. The effectiveness of PI molding was verified by fabricating composite laminates at various levels of chamber and inlet pressures and investigating the effect of these parameters on the fill time, fiber volume fraction, and void content. Furthermore, spatial distribution of voids was characterized by employing a unique method, which uses a flatbed scanner to capture the high-resolution planar scan of the fabricated laminates. The results revealed that PI molding reduced fill time by 45%, increased fiber volume fraction by 16%, reduced void content by 98%, improved short beam shear (SBS) strength by 14%, and yielded uniform spatial distribution of voids compared to those obtained by conventional VARTM.