| Abstract: | In this paper, the influence of init ial imperfection and
coupling between bending and extension on vibration, buckling and nonlinear dynamic stability
of laminated plates is studied. The governing e quation is derived. It is a nonlinear modified
Mathieu Equation. Numerical solut ions of 5 typical composite materials namely, Glass_epoxy
Scotch_1002, Aramid_ep oxy Kevlar_49, Boron_epoxy B4_5505, Graphite_epoxy T300_5208
and AS_3501 are co mputed. Results reveal that the existence of initial imperfection, and also
coup ling effect,make the plates much more sensitive to entering parametric resonance with
amplitude greater than that of perfect plates. Coupl ing effect for different composite laminates,
especially, for that with few laye rs, is different. If coupling effect is neglected, the design of
plate structure s for buckling and dynamic stability would unconservatively be for more than
10% . |
