Finite-element analysis of a polymer composite subjected to ball indentation

K. Váradi, Z. Néder, K. Friedrich, J. Flöck

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The finite-element (FE) contact technique presented in this paper is applied to the problem of steel-ball indentation of a composite material consisting of unidirectional continuous carbon fibres in a poly(ether ether ketone) matrix. Indentation was carried out with fibre orientations either normal (N) or parallel (P) to the contact surface at a fibre volume fraction of 0.44. The FE contact analysis involves both an anisotropic (homogeneous) macro- and (inhomogeneous) micro-contact analysis, following an approximate displacement coupling technique. The FE contact-stress analysis of a fibre/matrix micro-structure has a major limitation. If the FE micro-model is used, only a very small (for example 0.1 mm x 0.1 mm x 0.1 mm) 3D segment can be modelled. If an anisotropic model is used, there is no similar size limitation but the results cannot describe the stress and strain states of a real fibre/matrix micro-structure. The FE contact results show the location and the distribution of the sub-surface stresses and strains. For N fibre orientation there is a high shear stress region below the surface, from where the fibre/matrix interfacial failure initiates before propagating to the surface. In the case of P fibre orientation the matrix is subjected to local plastic deformation while the characteristic deformation of the fibre is bending.

Original languageEnglish
Pages (from-to)271-281
Number of pages11
JournalComposites Science and Technology
Volume59
Issue number2
DOIs
Publication statusPublished - Feb 1999

Fingerprint

Indentation
Polymers
Finite element method
Fiber reinforced materials
Fibers
Composite materials
Microstructure
Polyether ether ketones
Steel
Stress analysis
Carbon fibers
Macros
Shear stress
Volume fraction
Plastic deformation

ASJC Scopus subject areas

  • Engineering(all)
  • Ceramics and Composites

Cite this

Finite-element analysis of a polymer composite subjected to ball indentation. / Váradi, K.; Néder, Z.; Friedrich, K.; Flöck, J.

In: Composites Science and Technology, Vol. 59, No. 2, 02.1999, p. 271-281.

Research output: Contribution to journalArticle

Váradi, K. ; Néder, Z. ; Friedrich, K. ; Flöck, J. / Finite-element analysis of a polymer composite subjected to ball indentation. In: Composites Science and Technology. 1999 ; Vol. 59, No. 2. pp. 271-281.
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