Numerical and experimental studies of compressed composite columns with complex open cross-sections

             

Numerical and experimental studies of compressed composite columns with complex open cross-sections

Abstract

The article presents results of experimental investigations of thin-walled beams made with carbon fiber composite. Experimental studies were conducted to confirm results obtained from numerical calculations, which was performed using two different software based on finite element method and analytical-numerical method based on Koiter’s asymptotic stability theory of conservative systems modified by Byskov and Hutchinson. The studies consisted of axially compressed thin-walled columns with channel and top-hat cross section.

The specimen for the tests were made of unidirectional composite - epoxy resin matrix with carbon fibers reinforcement. The specimen was manufactured using autoclave technique. Thin-walled channel columns with dimensions of 80 × 40 × 1.048 mm and length of 300mm and with four different symmetrical ply arrangements were prepared.

The resulting axial force, longitudinal shortening and lateral displacement were recorded during experimental tests. Additionally in chosen points the strain were registered using strain gauges measurement technique.

The experimental critical loads using the different method were determined. The experimental results was compared with these obtained from finite element method (ANSYS and ABAQUS) and analytical-numerical method. The postbuckling equilibrium paths obtained from experimental tests and numerical calculation for all considered columns were compared.

Keywords

  • Thin-walled structure;
  • Compressed column;
  • Buckling;
  • Post-buckling behavior;
  • Finite element analysis;
  • Carbon-epoxy laminate;
  • Experimental test

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