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Size effects in plain-weave Astroquartz® deployable thin shells

Ferraro, Serena and Pellegrino, Sergio (2021) Size effects in plain-weave Astroquartz® deployable thin shells. Journal of Composite Materials, 55 (18). pp. 2417-2430. ISSN 0021-9983. doi:10.1177/0021998320987618.

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The general scaling trend for brittle materials, in which the strength increases when the sample size decreases, is reversed in plain-weave laminates of Astroquartz® and cyanate ester resin. Specifically, both the shear stiffness and the compressive strength decrease for test samples with widths smaller than 15 times the wavelength of the fabric, and observations at the microscale explain this behavior. The derived scaling is applied to the analysis of a deployable thin shell forming a 90∘ corner hinge with five cutouts on each side. The cutouts leave narrow strips of material with width as small as one fabric wavelength, forming structural ligaments whose strength and stiffness are subject to strong size-scaling effects. A numerical simulation of the folding process followed by a failure analysis is presented, using two alternative material models and failure criteria. The size independent model predicts that the structure will remain damage-free after it is folded and deployed, whereas the size-scaled model predicts that failure will occur. The correctness of the size-scaled model prediction is verified by measuring localized damage in a physical prototype, using x-ray CT scans.

Item Type:Article
Related URLs:
URLURL TypeDescription
Ferraro, Serena0000-0002-6038-7863
Pellegrino, Sergio0000-0001-9373-3278
Additional Information:© 2021 by SAGE Publications. Article first published online: January 27, 2021; Issue published: August 1, 2021. This work was supported by a NASA Space Technology Research Fellowship, with Dr. William Doggett as mentor. The help of Professor Christian Franck, Department of Mechanical Engineering University of Wisconsin-Madison, and his research group in using FIDVC is gratefully acknowledged.
Funding AgencyGrant Number
NASA Space Technology Research FellowshipNNX16AM77H
Subject Keywords:Size-scaling, plain-weave composites, deployable thin shells, digital volume correlation, x-ray computed tomography
Issue or Number:18
Record Number:CaltechAUTHORS:20210713-174100812
Persistent URL:
Official Citation:Ferraro S, Pellegrino S. Size effects in plain-weave Astroquartz® deployable thin shells. Journal of Composite Materials. 2021;55(18):2417-2430. doi: 10.1177/0021998320987618
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109789
Deposited By: Tony Diaz
Deposited On:13 Jul 2021 18:41
Last Modified:13 Jul 2021 23:02

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