Crack bridging modelling in Bioglass® based scaffolds reinforced by poly-vinyl alcohol/microfibrillated cellulose composite coating

Michal Kotoul, Petr Skalka, Oldřich Ševeček, Luca Bertolla, James Mertens, Petr Marcián, Nikhilesh Chawla

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The paper deals with crack bridging modelling in Bioglass® based scaffolds due the presence of a special polymer coating. This includes a careful modelling of the scaffold which is based on x-ray computed micro-tomography (micro-CT) scans and identification of bridging mechanism with the aid of extensive fractographic observations of coated, broken struts. A replacement of the real structure of scaffold by a periodic model utilizing Kelvin cell whose size corresponds to the mean cell size of the real foam is discussed. The struts of the idealized foam are modelled using the beam elements. A detailed computational analysis of crack bridging due to coating film fibrils under plane strain conditions is presented and an improvement of fracture resistance of coated scaffolds is explained.

Original languageEnglish (US)
Pages (from-to)16-28
Number of pages13
JournalMechanics of Materials
Volume110
DOIs
StatePublished - Jul 1 2017

Keywords

  • Bioceramic foams
  • Crack bridging
  • FEM
  • Irregular foam structure
  • Polymer coating
  • Voronoi tessellation

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation
  • Mechanics of Materials

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