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

doi:10.1016/j.mechmat.2017.04.004

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 journal › Article › peer-review

5 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 language	English (US)
Pages (from-to)	16-28
Number of pages	13
Journal	Mechanics of Materials
Volume	110
DOIs	https://doi.org/10.1016/j.mechmat.2017.04.004
State	Published - Jul 1 2017

Keywords

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

ASJC Scopus subject areas

General Materials Science
Instrumentation
Mechanics of Materials

Access to Document

10.1016/j.mechmat.2017.04.004

Cite this

@article{d1c868b452034f4b8f9cb430a20c6204,

title = "Crack bridging modelling in Bioglass{\textregistered} based scaffolds reinforced by poly-vinyl alcohol/microfibrillated cellulose composite coating",

abstract = "The paper deals with crack bridging modelling in Bioglass{\textregistered} 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.",

keywords = "Bioceramic foams, Crack bridging, FEM, Irregular foam structure, Polymer coating, Voronoi tessellation",

author = "Michal Kotoul and Petr Skalka and Old{\v r}ich {\v S}eve{\v c}ek and Luca Bertolla and James Mertens and Petr Marci{\'a}n and Nikhilesh Chawla",

note = "Funding Information: The authors gratefully acknowledge a financial support of Czech Science Foundation under the project No. 14-11234S. Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd",

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doi = "10.1016/j.mechmat.2017.04.004",

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AU - Kotoul, Michal

AU - Skalka, Petr

AU - Ševeček, Oldřich

AU - Bertolla, Luca

AU - Mertens, James

AU - Marcián, Petr

AU - Chawla, Nikhilesh

PY - 2017/7/1

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N2 - 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.

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KW - Irregular foam structure

KW - Polymer coating

KW - Voronoi tessellation

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