Analysis of amplitude-dependent damping properties of unidirectional aluminum-fiberglass plastics taking into account thermal cycling

Аuthors

Lopatin S. S.

,

e-mail: orochimaruninja@mail.ru

Abstract

This study investigates the effect of thermal cycling on the dynamic properties of unidirectional aluminum-glass composites. The tests were conducted on a specialized testing rig using the damped oscillation method with horizontal loading. The setup ensures the absence of external interference and transient processes. Amplitude control was performed using a triangulation laser sensor. The specimens consist of a composite structure comprising three layers of aluminum and two layers of fiberglass, arranged in longitudinal and transverse orientations. Aluminum-fiberglass samples were tested as part of this study. Each batch consisted of three identical rectangular samples. The tests were conducted at a fixed amplitude of 5 mm. The test results yielded the dynamic characteristics of the samples before and after thermal cycling. Experimental results and corresponding analysis are presented to determine the amplitude-dependent damping properties of layered composite materials. A significant change in the damping of the samples is observed after thermal cycling, accompanied by a change in the natural frequency of the damped oscillations. Examination of the samples after thermal cycling ruled out the formation of any delamination in the aluminum-glass-fiber composite layers. This fact indicates degradation of the composite material’s components. Since such a number of cycles and temperature range cannot affect the properties of the aluminum layers, it is reasonable to assume that the degradation of properties occurs in the glass fiber layers.

Keywords:

unidirectional composite materials; aluminum-fiberglass; thermal cycling; natural period; damping coefficient

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