Publication detail

Changes in Fracture Micromechanism with Increasing Reinforcement Volume Fraction in Glass Matrix Composite

ŘEHOŘEK, L. CHLUP, Z. DLOUHÝ, I. BOCCACCINI, A.

Czech title

Vliv objemového podílu křehkých částic v kompozitu se skelnou matricí na změny v mikromechanismu lomu

English title

Changes in Fracture Micromechanism with Increasing Reinforcement Volume Fraction in Glass Matrix Composite

Type

journal article - other

Language

en

Original abstract

Fracture behaviour and mechanical properties are the key features when a material for given application is supposed to be selected. Advanced glass ceramics composites are perspective structural materials for many applications due to their low production expenses and satisfactory properties even at elevated temperatures. Borosilicate glass matrix composite reinforced by alumina platelets was investigated to describe toughening mechanisms and their changes in a wide range of temperatures (from room temperature up to glassy transition temperature Tg). The dissipation of energy by bridging and/or deflection of propagating crack by alumina platelets uniformly dispersed in the glass matrix were the main toughening mechanisms observed. The alumina platelets have a higher ability to deflect propagating crack in comparison with spherical or rectangular particles having the same volume. Three and four point bend test for Youngs modulus and flexural strength determination was used. Fracture toughness determination was conducted using chevron notch technique. More than 100% increase of fracture toughness was observed when 30% of alumina platelets were added in to borosilicate matrix.

Czech abstract

Lomové chování a mechanické vlastnosti hrají klíčovou roli pro všechny materiály v inženýrské praxi. Skelné kompozity jsou perspektivní materiály v mnoha aplikacích pro jejich snadnou a levnou výrobu. V této práci bylo studováno lomové chování borosilikátového skla s destičkami korundu a jejich vliv na zhouževnaťování a změnu morfologie lomové plochy. Byl aplikován tří a čtyřbodový ohyb a byly měřeny: lomová houževnatost, pevnost v ohybu, modul pružnosti.

English abstract

Fracture behaviour and mechanical properties are the key features when a material for given application is supposed to be selected. Advanced glass ceramics composites are perspective structural materials for many applications due to their low production expenses and satisfactory properties even at elevated temperatures. Borosilicate glass matrix composite reinforced by alumina platelets was investigated to describe toughening mechanisms and their changes in a wide range of temperatures (from room temperature up to glassy transition temperature Tg). The dissipation of energy by bridging and/or deflection of propagating crack by alumina platelets uniformly dispersed in the glass matrix were the main toughening mechanisms observed. The alumina platelets have a higher ability to deflect propagating crack in comparison with spherical or rectangular particles having the same volume. Three and four point bend test for Youngs modulus and flexural strength determination was used. Fracture toughness determination was conducted using chevron notch technique. More than 100% increase of fracture toughness was observed when 30% of alumina platelets were added in to borosilicate matrix.

Keywords in English

glass-ceramics, fracture mechanics, fracture toughness, roughness, toughening

RIV year

2008

Released

06.12.2007

Location

Švýcarsko

ISSN

0255-5476

Journal

Materials Science Forum

Volume

567-568

Number

2008

Pages from–to

369–372

Pages count

4

BIBTEX


@article{BUT44816,
  author="Lukáš {Řehořek} and Zdeněk {Chlup} and Ivo {Dlouhý} and Aldo {Boccaccini},
  title="Changes in Fracture Micromechanism with Increasing Reinforcement Volume Fraction in Glass Matrix Composite",
  journal="Materials Science Forum",
  year="2007",
  volume="567-568",
  number="2008",
  month="December",
  pages="369--372",
  address="Švýcarsko",
  issn="0255-5476"
}