Affiliations: School of Mechanical Engineering, Sharif University of
Technology, Tehran, Iran
Note: [] Corresponding author: M.H. Kargarnovin, School of Mechanical
Engineering, Sharif University of Technology, 14588–89694, Tehran, Iran.
Tel.: +98 216 616 5510; Fax: +98 216 600 0021; E-mail: [email protected]
Abstract: This paper presents the dynamic response of a delaminated composite
beam under the action of a moving oscillating mass. In this analysis the
Poisson's effect is considered for the first time. Moreover, the effects of
rotary inertia and shear deformation are incorporated. In our modeling linear
springs are used between delaminated surfaces to simulate the dynamic
interaction between sub-beams. To solve the governing differential equations of
motion using modal expansion series, eigen-solution technique is used to obtain
the natural frequencies and their corresponding mode shapes necessary for
forced vibration analysis. The obtained results for the free and forced
vibrations of beams are verified against reported similar results in the
literatures. Moreover, the maximum dynamic response of such beam is compared
with an intact beam. The effects of different parameters such as the velocity
of oscillating mass, different ply configuration and the delamination length,
its depth and spanwise location on the dynamic response of the beam are
studied. In addition, the effects of delamination parameters on the oscillator
critical speed are investigated. Furthermore, different conditions under which
the detachment of moving oscillator from the beam will initiate are investigated.
