Identification of elastic properties of laminates based on experiment design

A numerical–experimental method for identification of elastic properties of laminated composites from the experimental results is developed. It is proposed to use the method of experiment design and the response surface approach to solve the identification (inverse) problems. The response surface ap...

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Veröffentlicht in:International journal of solids and structures 2001-07, Vol.38 (30), p.5097-5115
Hauptverfasser: Rikards, R, Chate, A, Gailis, G
Format: Artikel
Sprache:eng
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Zusammenfassung:A numerical–experimental method for identification of elastic properties of laminated composites from the experimental results is developed. It is proposed to use the method of experiment design and the response surface approach to solve the identification (inverse) problems. The response surface approximations are obtained by using the information on the behavior of a structure in the reference points of the experiment design. The finite element modeling of the structure is performed only in the reference points. Therefore, a significant reduction (about 50–100 times) in calculations of the identification functional can be achieved in comparison with the conventional methods of minimization. The functional to be minimized describes the difference between the measured and numerically calculated eigenfrequencies of structure. By minimizing the functional the identification parameters are obtained. It was shown that identification functional is convex if the stiffness matrix linearly depends on unknown parameters. The method is employed to identify the elastic properties of cross-ply laminates from the measured eigenfrequencies of composite plates.
ISSN:0020-7683
1879-2146
DOI:10.1016/S0020-7683(00)00349-8