Abstract
The buckling behavior of orthotropic square plate, either with or without a central circular hole, is analyzed with the aid of the finite element method. Materials with different degrees of orthotropy are examined. Both uniaxial and biaxial compression are considered for various boundary conditions. For highly orthotropic material under uniaxial or biaxial compression in the weaker direction, there is a tendency for the lowest buckling mode not to be a single half-wave. It is found that the first buckling mode may be two or three half-waves, depending on the degrees of orthotropy as well as boundary conditions. The characteristics of buckling strength and mode shape of orthotropic plates with central circular holes are presented and discussed in this paper.
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