Harmonical and modal analysis to determine the anisotropic properties of aviation composite materials

• Autorzy: Acopyan A. , Axenov V. , Shevtsov V. , Soloviev A. , Tamarkina E.
• Języki publikacji: EN

Abstrakty

EN

The value of all composite elastic modules has the crucial influence on dynamic behaviour of aviation load-bearing structures. Numerous experimental techniques and standards are used to characterize the elastic properties of polymeric composite materials. Among this is the large group of static tests, acoustic methods based on longitudinal, lateral or shear surface sound wave speed measurements and also on vibrating surfaces amplitude measurements. However, preparation specimens for static test with shape required by standards not always possible from already manufactured piece. Again the designated dynamic experiment introduces difficulties of investigated specimen acoustic isolating, impossibility of some required wave type excitation and performing of displacements field measurement with guaranteed precision. In this study an acoustic method is developed using the measure of all specimen's eigenfrequencies in a certain frequency range. Small rectangular composite specimen is excited by glued piezoelectric actuator and response is measured by piezoelectric sensor. Preliminary performed finite-element (FE) analyses serve to think the vibration natural modes of linked mechanical system - specimen and piezoelectric element. In this FE analyse the rough estimations of all elastic constants obtained from other independents (as a rule static) experiments were used. Further the amelioration of initial elastic modules was performed. Thereby the target nonlinear functional dependent on all quest modules was minimized by genetic and (or) Levenberg-Marquardt algorithm.

Słowa kluczowe

EN

polymeric composite; elastic module; acoustic measurements; eigenmodes; finite element method

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2007
• Tom: Vol. 14, No. 3
• Strony: 11--18
• Opis fizyczny: Bibliogr. 17 poz., rys.

Twórcy

autor

Acopyan A.

autor

Axenov V.

autor

Shevtsov V.

autor

Soloviev A.

autor

Tamarkina E.

• Institute of Mechanics and Applied Mathematics, Department of Materials Strength Stachky Street 249, 344009 Rostov-on-Don, Russia tel. [phone],

Bibliografia

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