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Open AccessArticle

C0 Layerwise Model with Fixed Degrees of Freedom and Variable In- and Out-of-Plane Kinematics by Strain Energy Updating Technique

by Ugo Icardi *,† and Federico Sola
Dipartimento di Ingegneria Meccanica e Aerospaziale, Politecnico di Torino—Corso Duca degli Abruzzi 24, 10129 Torino, Italy
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Konstantinos Kontis
Aerospace 2015, 2(4), 637-672; https://doi.org/10.3390/aerospace2040637
Received: 19 October 2015 / Revised: 11 November 2015 / Accepted: 11 November 2015 / Published: 17 November 2015
(This article belongs to the Special Issue Feature Papers in Aerospace)
Physically based zigzag models have the merit of giving accurate stress predictions for laminates and sandwiches keeping fixed the functional degrees of freedom, though at the expense of the introduction of their derivatives. In the present paper, a technique that enables deleting these derivatives is developed. The objective is finding a priori corrections of displacements, which make the energy of the model with all the derivatives neglected equivalent to that of its initial counterpart model containing all the derivatives. Numerical applications show that this technique can obtain accurate results, even for strongly asymmetrical lay-ups, keeping low the computational cost. View Full-Text
Keywords: zigzag model; fixed degrees of freedom (d.o.f.); technique for converting derivatives; stress analysis zigzag model; fixed degrees of freedom (d.o.f.); technique for converting derivatives; stress analysis
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MDPI and ACS Style

Icardi, U.; Sola, F. C0 Layerwise Model with Fixed Degrees of Freedom and Variable In- and Out-of-Plane Kinematics by Strain Energy Updating Technique. Aerospace 2015, 2, 637-672.

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