Nonlinear resonant behavior of microbeams over the buckled state

Hamed Farokhi, Mergen H. Ghayesh*, Marco Amabili

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

70 Citations (Scopus)


The present study investigates the nonlinear resonant behavior of a microbeam over its buckled (non-trivial) configuration. The system is assumed to be subjected to an axial load along with a distributed transverse harmonic load. The axial load is increased leading the system to lose the stability via a pitchfork bifurcation; the postbuckling configuration is obtained and the nonlinear resonant response of the system over the buckled state is examined. More specifically, the nonlinear equation of motion is obtained employing Hamilton's principle along with the modified couple stress theory. The continuous system is truncated into a system with finite degrees of freedom; the Galerkin scheme is employed to discretize the nonlinear partial differential equation of motion into a set of ordinary differential equations. This set of equations is solved numerically employing the pseudo-arclength continuation technique; first a nonlinear static analysis is performed upon this set of equations so as to obtain the onset of buckling (supercritical pitchfork bifurcation) and the buckled configuration of the microbeam. The frequency-response and force-response curves of the system are then constructed over the buckled configurations. A comparison is made between the frequency-response curves obtained by means of the modified couple stress and the classical theories. The effect of different system parameters on the frequency-response and force-response curves is also examined.

Original languageEnglish
Pages (from-to)297-307
Number of pages11
JournalApplied Physics A: Materials Science and Processing
Issue number2
Early online date24 Aug 2013
Publication statusPublished - 1 Nov 2013


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