Micro-buckling of periodically layered composites in regions of stress concentration

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Abstract

Under longitudinal compressive loading, periodically layered composites are prone to micro-buckling, which is often the decisive mechanism determining their strength. This paper is concerned with the load carrying capacity of structures made of layered composites with respect to micro-buckling related failure in regions of stress concentrations. A series of parametric studies show the effect of non-uniform stress distributions due to bending loads and the presence of geometrical features such as notches and holes on the initiation of micro-buckling. The contribution of the bending stiffness of the reinforcing layers on the resistance against micro-buckling introduces a dependence on the layer thickness, resulting in size-scale dependent strength limits. Therefore, both the shape and dimensions of the considered geometrical features and the layering thickness of the micro-structure are varied as part of the parametric studies. Moreover, the impact of imperfections in the composite micro-structure on the strength of the considered specimens is investigated.
Original languageEnglish
JournalComposite Structures
Volume157
Pages (from-to)424-435
ISSN0263-8223
DOIs
Publication statusPublished - 2016

Keywords

  • Composite materials
  • Micro-buckling
  • Size effects
  • Stress concentration

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