Apparent volumetric shrinkage study of RTM6 resin during the curing process and its effect on the residual stresses in a composite

Magniez, K, Vijayan, A and Finn, N 2012, 'Apparent volumetric shrinkage study of RTM6 resin during the curing process and its effect on the residual stresses in a composite', Polymer Engineering and Science, vol. 52, no. 2, pp. 346-351.


Document type: Journal Article
Collection: Journal Articles

Title Apparent volumetric shrinkage study of RTM6 resin during the curing process and its effect on the residual stresses in a composite
Author(s) Magniez, K
Vijayan, A
Finn, N
Year 2012
Journal name Polymer Engineering and Science
Volume number 52
Issue number 2
Start page 346
End page 351
Total pages 6
Publisher John Wiley & Sons
Abstract A comprehensive characterization of the volumetric shrinkage of a commercially important aerospace resin (RTM6) during the various stages of the curing process was studied. The apparent volumetric shrinkage, evaluated from density measurements at room temperature, was correlated with the progress of epoxide conversion. During the entire curing process, the apparent volume shrinkage was found to be less than 3% and occurred before vitrification. A slight re-expansion of the resin, attributed to self-antiplasticization effects, was observed during postcuring at 1808C. It was concluded that residual stresses were not generated due to chemical cross-linking during curing but rather from thermal contraction occurring during the cooling stage after cure. A photo-elastic method was used to characterize residual stresses during cooling in a deliberately engineered resin rich hole of a carbon fiber/RTM6 composite. The residual stress was found to reach approximately 28 MPa, which is in good agreement with the value calculated from the shrinkage and elastic moduli. It is proposed that this simple method can be provide insights useful to the design and materials selection processes by measuring and localizing residual stresses from resin during curing and or thermal cycling.
Subject Textile Technology
Composite and Hybrid Materials
Keyword(s) Apparent volume
Chemical cross-linking
Cooling stage
Curing process
Materials selection
Post-curing
Re-expansion
Room temperature
SIMPLE method
Thermal contraction
Volumetric shrinkage
DOI - identifier 10.1002/pen.22088
Copyright notice © 2011 Society of Plastics Engineers
ISSN 0032-3888
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