Influence of specimen geometry on apparent Poisson’s ratio evaluated under the compressive loading of quasi-isotropic CFRP laminate

Eiichi Hara, Hisaya Katoh, Yutaka Iwahori, Tomohiro Yokozeki

Research output: Contribution to journalArticle

Abstract

The effects of specimen geometry on the Poisson’s ratio of a quasi-isotropic carbon-fiber-reinforced polymer laminate were examined using compression tests. In particular, the divergence of the apparent Poisson’s ratio from the theoretical value was experimentally determined for a decreasing specimen width/thickness ratio (b/t). The observed tendency was then confirmed by simulations using a finite element analysis (FEA). The FEA was performed using a 3D model of the specimens to investigate the strain and stress distribution. In the evaluation of the apparent Poisson’s ratio, the strain in the width direction was shown to vary under the condition of low b/t. The FEA results revealed that changes to the width strain were caused by cross-sectional deformation under compressive loading, resulting from differences in layer angles and stiffness between the outermost and inner layers.

Original languageEnglish
JournalAdvanced Composite Materials
DOIs
Publication statusAccepted/In press - 1 Jan 2020

Keywords

  • composite materials
  • compressive test
  • Poisson’s ratio
  • quasi-isotropic laminate

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