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research article

Efficient equilibrium-based stress recovery for isogeometric laminated curved structures

Patton, Alessia
•
Antolin, Pablo  
•
Kiendl, Josef
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September 15, 2021
Composite Structures

This work extends the stress recovery for laminated composite solid plates, proposed in [1,2], to curved structures. Based on 3D Isogeometric Analysis (IGA) computations and equilibrium, this procedure uses a single element through the thickness in combination with a calibrated layer-by-layer integration rule or a homogenized approach, allowing for an inexpensive and accurate approximation in terms of in-plane stresses (and their derivatives), while through-the-thickness stress components are poorly approximated. Relying on the highorder continuity properties of IGA shape functions, an accurate out-of-plane stress state can also be recovered by means of direct integration of the equilibrium equations in strong form. The a posteriori step application, which is straightforward in the context of solid plates, is not trivial in the case of curved geometries. In fact, the notion of in-plane and out-of-plane directions is not clear when modeling this kind of structures in the global reference system, while adopting curvilinear coordinates to express the equilibrium gives rise to additional coupled terms that require an iterative process to resolve the balance of momentum equation. Therefore, we propose to apply the recovery locally, which, despite leading to more elaborated stress derivative terms because of the increasing geometry complexity, still allows for a direct reconstruction as the resolvent system is uncoupled. Several numerical results show the good performance of this approach particularly for composite stacks with significant radius-to-thickness ratio and number of plies.

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Type
research article
DOI
10.1016/j.compstruct.2021.113975
Web of Science ID

WOS:000677917300013

Author(s)
Patton, Alessia
Antolin, Pablo  
Kiendl, Josef
Reali, Alessandro
Date Issued

2021-09-15

Publisher

ELSEVIER SCI LTD

Published in
Composite Structures
Volume

272

Article Number

113975

Subjects

Mechanics

•

Materials Science, Composites

•

Materials Science

•

laminated composite structures

•

curved geometries

•

stress-recovery procedure

•

equilibrium

•

isogeometric analysis

•

collocation methods

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finite-element-analysis

•

composite plates

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sandwich plates

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order theory

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deformation

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nurbs

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formulation

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elasticity

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shells

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
MNS  
Available on Infoscience
August 14, 2021
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/180597
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