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Nonlinear Buckling Analysis of Laminated Composite Twisted Plate

Author Affiliations

  • 1Department of Civil Engineering, Raghu Institute Technology, Visakhapatnam-531162, INDIA
  • 2 Department of Civil Engineering, National Institute of Technology, Rourkela-769008, INDIA

Res. J. Engineering Sci., Volume 4, Issue (4), Pages 1-8, April,26 (2015)


The twisted plate has various applications in turbine blades, compressor blades, fan blades and particularly in gas turbines. Many of these plates are subjected to in-plane load due to fluid or aerodynamic pressures. Buckling of such plates is of special importance especially if the plates are thin. Hence it is necessary to study their behaviour under different types of loads.. For a complete buckling study, a geometrically nonlinear analysis should be carried out. In a geometrically nonlinear analysis, the stiffness matrix of the structure is updated between loading increments to take into account deformations which affect the structural behaviour unlike a linear buckling analysis where the stiffness matrix is constant through the analysis. .The buckling of twisted plates is investigated by a nonlinear analysis. The effect of number of layers, changing angle of twist, width to thickness ratio, aspect ratio, etc are studied. It is observed in all cases that the buckling load by nonlinear analysis is lesser than that predicted by a linear analysis which proves the importance of the present study.


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