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Proceedings Paper

Three-dimensional finite element analysis of composite patches with structurally integrated fiber optic sensing
Author(s): George J. Tsamasphyros; Nikolaos K. Furnarakis; Georgios N. Kanderakis; Zaira P. Marioli-Riga
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Paper Abstract

A three-dimensional model of a structurally integrated optical fiber sensor into a composite patch bonded over a cracked metallic structure is built using ANSYS finite elements analysis program. Composite patch is modeled assuming three- dimensional epoxy matrix with embedded cylindrical carbon fibers and optical fiber sensors. The latter is composed from two different materials to represent the core/cladding and the protective coating. The whole patch is perfectly bonded over a cracked aluminum sheet. External loads are applied only on the metal structure, as in a real repair case. The primary loading axis of the metal is parallel to the direction of the optical and the carbon fibers. However, because of the different nature of the materials that form the composite patch, complex mechanical interactions between the fibers and the surrounding material occur, resulting in a complicated strain field along the optical fiber sensor, which causes significant sensing variations. Different crack lengths are assumed in order to study their effect on the strain field of the optical fibers at different points across its radius, as well as the variation of the stress field along the optical sensor and the corresponding plots were produced.

Paper Details

Date Published: 22 June 2000
PDF: 10 pages
Proc. SPIE 3985, Smart Structures and Materials 2000: Smart Structures and Integrated Systems, (22 June 2000); doi: 10.1117/12.388885
Show Author Affiliations
George J. Tsamasphyros, National Technical Univ. of Athens (Greece)
Nikolaos K. Furnarakis, National Technical Univ. of Athens (Greece)
Georgios N. Kanderakis, National Technical Univ. of Athens (Greece)
Zaira P. Marioli-Riga, Hellenic Aerospace Industry Ltd. (Greece)

Published in SPIE Proceedings Vol. 3985:
Smart Structures and Materials 2000: Smart Structures and Integrated Systems
Norman M. Wereley, Editor(s)

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