Non-Linear Analysis of Wrinkling Phenomenain Sandwich Beams with a Soft Core

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Authors

  • Paweł Jasion Poznan University of Technology, Poland ORCID ID 0000-0003-4562-2535
  • Iwona Małgorzata Wstawska Poznan University of Technology, Poland ORCID ID 0000-0002-0211-3979
  • Kamil Kołodziński Poznan University of Technology, Poland

Abstract

This work is devoted to the local stability analysis of sandwich beams with a light core. A linear as well as a non-linear numerical analysis is carried out with the use of the finite element method (FEM). Both material and geometrical nonlinearities are taken into account. The goal of the investigation is to examine the influence of the material model on the post-buckling behaviour of a sandwich beam, especially on the formation and development of wrinkles on the compressed face. A pure bending condition is considered for a beam simply supported at both ends. The results for materials of theoretical properties are presented as well as for data from experiments on aluminium sandwich beams. From the results, it is seen that the linear analysis of the wrinkling phenomenon for non-linear materials gives overestimated results and does not predict correctly the buckling shape.

Keywords:

wrinkling, sandwich beams, bending, buckling, equilibrium path, non-linear analysis

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