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A Viscoelastic Based Mechanism for Improving Spring-In Angle Predictions in Compression Molded Thermoplastic Matrix Composites

[+] Author Affiliations
Corey Lynam, Abbas S. Milani

University of British Columbia - Okanagan, Kelowna, BC, Canada

Paper No. DETC2010-28472, pp. 21-27; 7 pages
  • ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 1: 36th Design Automation Conference, Parts A and B
  • Montreal, Quebec, Canada, August 15–18, 2010
  • Conference Sponsors: Design Engineering Division and Computers in Engineering Division
  • ISBN: 978-0-7918-4409-0 | eISBN: 978-0-7918-3881-5
  • Copyright © 2010 by ASME


In this paper, dimensional distortion during the compression molding of thermoplastic matrix composites, typically described as spring-in or spring forward, is investigated through a finite element model. Spring-in is the reduction of the enclosed angle of two surfaces on the final component shape with respect to the original mold shape. Spring-in of thermoplastic matrix composites has typically been attributed to the difference in the thermal expansion of in-plane and through thickness directions of the composite. However, using this mechanism alone during modeling has not shown complete agreement with the experimental data. A new meso-level mechanism based on the viscoelasticity effect of the thermoplastic matrix is proposed. With this mechanism, the predicted spring-in angle can be in good agreement with experiments.

Copyright © 2010 by ASME



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