期刊
COMPOSITE STRUCTURES
卷 127, 期 -, 页码 69-76出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2015.02.081
关键词
Sandwich structures; Shape sensing; Stress sensing; Inverse Finite Element Method
资金
- National Institute of Aerospace (NIA)
- NASA Langley research Center, Hampton, Virginia
The real-time reconstruction of the displacement and stress fields from discrete-location strain measurements is a fundamental feature for monitoring systems, which is generally referred to as shape- and stress-sensing. Presented herein is a computationally efficient shape- and stress-sensing methodology that is ideally suited for applications to laminated composite and sandwich structures. The new approach employs the inverse Finite Element Method (iFEM) as a general framework and the Refined Zigzag Theory (RZT) as the underlying plate theory. Using a C-0-discretization, a three-node inverse plate finite element is formulated. The element formulation enables robust and efficient modeling of plate structures instrumented with strain sensors that have arbitrary positions. The methodology leads to a set of linear algebraic equations that are solved efficiently for the unknown nodal displacements. These displacements are then used at the finite element level to compute full-field strains and stresses that may be in turn used to assess structural integrity. Numerical results for multilayered, highly heterogeneous laminates demonstrate the unique capability of this new formulation for shape- and stress-sensing. (C) 2015 Elsevier Ltd. All rights reserved.
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