MATEC Web Conf.
Volume 211, 2018The 14th International Conference on Vibration Engineering and Technology of Machinery (VETOMAC XIV)
|Number of page(s)||6|
|Section||NC: Nonlinear Dynamics and Control of Engineering Systems; TP1: Non-linear vibrations|
|Published online||10 October 2018|
Geometrically nonlinear free and forced vibrations analysis of clamped-clamped functionally graded beams with multicracks
Mohammed V University in Rabat, ENSET - Rabat, MSSM,
B.P.6207, Rabat Institute,
2 Hassan II University of Casablanca, EST - CASABLANCA, LMPGI, B.P.8012 Oasis, Casablanca, Morocco
3 Mohammed V University in Rabat, EMI - Rabat, LERSIM, B.P.765 Agdal, Rabat, Morocco
* Corresponding author: email@example.com
Geometrically nonlinear free and forced vibrations of clampedclamped Functionally Graded beams with multi-cracks, located at different positions, based on the equivalent rotational spring model of crack and the transfer matrix method for beams is investigated. The FG beam properties are supposed to vary continuously through the thickness direction. The theoretical model is based on the Euler-Bernoulli beam theory and the Von Karman geometrical nonlinearity assumptions. A homogenization procedure, taking into account the presence of the crack, is developed to reduce the problem examined to that of an equivalent isotropic homogeneous multi-cracked beam. Upon assuming harmonic motion, the discretized expressions for the total strain and kinetic energies of the beam are derived, and through application of Hamilton’s principle and spectral analysis, the problem is reduced to a nonlinear algebraic system solved using an approximate explicit method developed previously (second formulation) to obtain numerically the FG multi-cracked beam nonlinear fundamental mode and the corresponding backbone curves for a wide range of vibration amplitudes. The numerical results presented show the effect of the number of cracks, the crack depths and locations, and the volume fraction on the beam nonlinear dynamic response.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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