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Post-cure shape errors of ultra-thin symmetric CFRP laminates: Effect of ply-level imperfections

Steeves, John and Pellegrino, Sergio (2017) Post-cure shape errors of ultra-thin symmetric CFRP laminates: Effect of ply-level imperfections. Composite Structures, 164 . pp. 237-247. ISSN 0263-8223 . http://resolver.caltech.edu/CaltechAUTHORS:20170317-082612485

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Abstract

This paper discusses the effect of misalignments in ply orientation, uniform variations in ply thickness, and through-thickness thermal gradients on the post-cure shape errors for symmetric cross-ply laminates constructed from ultra-thin composite materials. Photogrammetry-based surface measurements are performed for laminates cured at elevated temperatures. Significant out-of-plane shape errors are observed, with amplitudes ∼75 times the laminate thickness. The magnitude of each imperfection is also characterized experimentally on coupon-level samples. A non-linear finite element model is developed and demonstrates that these imperfections result in cylindrical and twisting modes of deformation. Results are compared to Classical Lamination Theory predictions which are shown to be inadequate in predicting shape errors that require changes in Gaussian curvature. Through these studies, it is determined that thickness variations between the top and bottom plies have the most pronounced effect on shape errors.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.compstruct.2016.12.075DOIArticle
http://www.sciencedirect.com/science/article/pii/S0263822316315070PublisherArticle
ORCID:
AuthorORCID
Pellegrino, Sergio0000-0001-9373-3278
Additional Information:© 2017 Elsevier Ltd. Received 10 August 2016, Revised 10 December 2016, Accepted 27 December 2016, Available online 29 December 2016.
Subject Keywords:Thin-ply composites; CFRP; Cross-ply; Imperfections; Shape errors
Record Number:CaltechAUTHORS:20170317-082612485
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170317-082612485
Official Citation:John Steeves, Sergio Pellegrino, Post-cure shape errors of ultra-thin symmetric CFRP laminates: Effect of ply-level imperfections, Composite Structures, Volume 164, 15 March 2017, Pages 237-247, ISSN 0263-8223, http://dx.doi.org/10.1016/j.compstruct.2016.12.075. (http://www.sciencedirect.com/science/article/pii/S0263822316315070)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:75195
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:17 Mar 2017 16:21
Last Modified:17 Mar 2017 16:21

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