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The non–symmetric, general laminate exhibits different types of coupling between the
extension, shearing, bending and twisting. For practical reasons, the in–plane coupled
laminate is a particularly interesting. In this case, the coupling between shearing and
extension takes place. Details calculations were performed for a short columns of square
cross-section made of in–plane coupled and fully uncoupled laminate under uniform compression.
Finite element method (FEM) and analytical–numerical method (ANM) were
performed. In FEM analyses, the eigenbuckling problem has been solved using the Lanczos
method, whereas the nonlinear buckling analysis were performed using the Newton–
Raphson method and the Ritz method. In ANM analyses, the Koiter’s asymptotic theory
is applied. The relationship between forces/moments and deformations/curvature were
described using classical lamination theory (CLT). The coupling between in–plane shearing
and extension has a significant influence on the behavior of thin–walled structures
under compression.
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