Abstract
The four modes of vibration of an isotropic rectangular plate with an inclined crack are investigated. It is assumed that the crack remains continuous and its center is located at the center of the plate. The governing nonlinear equation of the transverse vibration of the plate with the plate boundary conditions being simply-supported on all edges is developed. The multiple scale perturbation method is utilized as the solution procedure to find the steady-state frequency response equations for all the four modes of vibration. The equations for the free and forced vibrations are derived and their frequency responses are presented. A special case of large-scale excitation force has also been considered. The parameter sensitivity analysis for the angle of crack, length of crack and the position of the external applied excitation force is performed. It has been shown that according to the aspect ratio of the plate, the vibration modes can have either nonlinear hardening effect or nonlinear softening behavior.
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The financial support provided by the Natural Science and Engineering Research Council (NSERC) of Canada to complete this research is gratefully acknowledged.
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Appendices
Appendices
1.1 Appendix 1
Common coefficient expressions:
Coefficients of the first mode of vibration:
Second mode coefficients:
Coefficients of the third mode of vibration:
Fourth mode coefficients:
1.2 Appendix 2
The procedure of deriving Eq. (15)–(18) from Eq. (1) has been presented here. In the first step, by substituting Eqs. (3), (4), (8) and (9) into Eq. (1) one will find:
Then by substituting Eqs. (5), (6), (7) and (10) into Eq. (94) leads into:
Based on the Galerkin’s method, the general form of the transverse deflection of the plate from Eq. (11) has been substituted into Eq. (95):
In this Appendix the derivation of the equation of the vibration for first mode has been described in detail. The same procedure has been employed to derive the equation of the vibration for other three modes. To derived Eq. (15), the modal functions of the first mode have to be substituted in to Eq. (96). These modal functions based on the Eqs. (12) and (13) would be:
By substituting Eqs. (97) and (98) into Eq. (96) and multiply by \(X_{1}Y_{1}\) and taking integral over the plate surface, one can obtain:
In the final step, by factorizing terms and cancelling \(\frac{l_1 l_2 }{4}A_{11} \pi ^{2}\) from Eq. (99) one finds:
The coefficients of Eq. (100) have been listed in Appendix I.
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Diba, F., Esmailzadeh, E. & Younesian, D. Nonlinear vibration analysis of isotropic plate with inclined part-through surface crack. Nonlinear Dyn 78, 2377–2397 (2014). https://doi.org/10.1007/s11071-014-1595-7
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DOI: https://doi.org/10.1007/s11071-014-1595-7