Identification of the single ply properties in fiber-metall lamintes


Аuthors

Tran Q. T.

Le Quy Don Technical University, 236 Hoang Quoc Viet, Ha Noi, Viet Nam

e-mail: quyetthang.mai@gmail.com

Abstract

The paper presents the results of identifying the elastic characteristics and loss coefficients of monolayers of a metal-polymer composite consisting of layers of aluminum alloy and fiberglass (aluminum fiberglass). Identification was carried out on the basis of tests for damped vibrations of cantilever-mounted samples. For dynamic testing, the samples were rigidly fixed with a metallic clamp at one end, leaving the other end free. Subsequently, an impact was applied to the free end using a metallic striker, or an initial deflection of the beam’s end from the equilibrium position was set. Displacements in the free end zone of the samples were measured by a laser displacement sensor and transferred to a program that allowed for the registration of displacement/time curves, saving them in tabular and graphical formats. The length of the free end of the beam, denoted as L (excluding the clamps), was determined to achieve a specified natural frequency of beam oscillations ω0 (20, 30 or 60 Hz). Specific values of lengths were used for beams with different laying schemes. The maximum deflection of the beam was A0 = 0.08L. The tests measured the natural vibration frequencies and loss coefficients of composite samples with various reinforcement schemes. Identification is performed based on solving the inverse problem using the classical theory of multilayer beams and the complex module method. Three approaches to solving the inverse problem are considered, in which a separate identification procedure is carried out for the elastic characteristics of monolayers based on the results of static or dynamic tests, or simultaneous identification of elastic and damping parameters is carried out based on dynamic test data.

Keywords:

glass laminate aluminum reinforced epoxy, GLARE, identification, monolayer, dynamic properties, natural frequency, loss factor

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