An enhanced inverse finite element method for displacement and stress monitoring of multilayered composite and sandwich structures

Adnan Kefal, Alexander Tessler, Erkan Oterkus

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The inverse finite element method (iFEM) is an innovative framework for dynamic tracking of full-field structural displacements and stresses in structures that are instrumented with a network of strain sensors. In this study, an improved iFEM formulation is proposed for displacement and stress monitoring of laminated composite and sandwich plates and shells. The formulation includes the kinematics of Refined Zigzag Theory (RZT) as its baseline. The present iFEM methodology minimizes a weighted-least-squares functional that uses the complete set of strain measures of RZT. The main advantage of the current formulation is that highly accurate through-the-thickness distributions of displacements, strains, and stresses are attainable using an element based on simple C0-continuous displacement interpolation functions. Moreover, a relatively small number of strain gauges is required. A three-node inverse-shell element, named i3-RZT, is developed. Two example problems are examined in detail: (1) a simply supported rectangular laminated composite plate and (2) a wedge structure with a hole near one of the clamped ends. The numerical results demonstrate the superior capability and potential applicability of the i3-RZT/iFEM methodology for performing accurate shape and stress sensing of complex composite structures.
LanguageEnglish
Pages514-540
Number of pages27
JournalComposite Structures
Volume179
Early online date23 Jul 2017
DOIs
Publication statusPublished - 1 Nov 2017

Fingerprint

Sandwich structures
Composite structures
Finite element method
Monitoring
Laminated composites
Strain gages
Interpolation
Kinematics
Sensors

Keywords

  • shape sensing
  • stress sensing
  • multilayered composite structures
  • sandwich structures
  • inverse finite element method
  • refined zigzag theory
  • strain sensors

Cite this

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abstract = "The inverse finite element method (iFEM) is an innovative framework for dynamic tracking of full-field structural displacements and stresses in structures that are instrumented with a network of strain sensors. In this study, an improved iFEM formulation is proposed for displacement and stress monitoring of laminated composite and sandwich plates and shells. The formulation includes the kinematics of Refined Zigzag Theory (RZT) as its baseline. The present iFEM methodology minimizes a weighted-least-squares functional that uses the complete set of strain measures of RZT. The main advantage of the current formulation is that highly accurate through-the-thickness distributions of displacements, strains, and stresses are attainable using an element based on simple C0-continuous displacement interpolation functions. Moreover, a relatively small number of strain gauges is required. A three-node inverse-shell element, named i3-RZT, is developed. Two example problems are examined in detail: (1) a simply supported rectangular laminated composite plate and (2) a wedge structure with a hole near one of the clamped ends. The numerical results demonstrate the superior capability and potential applicability of the i3-RZT/iFEM methodology for performing accurate shape and stress sensing of complex composite structures.",
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An enhanced inverse finite element method for displacement and stress monitoring of multilayered composite and sandwich structures. / Kefal, Adnan; Tessler, Alexander; Oterkus, Erkan.

In: Composite Structures, Vol. 179, 01.11.2017, p. 514-540.

Research output: Contribution to journalArticle

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