Detail publikace

Assessment of viscoelastic crack bridging toughening in refractory materials

BOCCACCINI, D. CANNIO, M. VOLKOV-HUSOVIC, T. DLOUHÝ, I. ROMAGNOLI, M. VERONESI, P. LEONELLI, C.

Originální název

Assessment of viscoelastic crack bridging toughening in refractory materials

Typ

článek v časopise - ostatní, Jost

Jazyk

angličtina

Originální abstrakt

Viscoelastic bridges can be formed in refractory ceramics while cooling from high temperatures. Such bridges can shield crack tips, thus reducing the effective crack tip stress intensity factors leading to higher resistance to creep and thermal shock. The extent to which the crack tip stress intensity is reduced can be estimated from fracture mechanics models that include experimental measurement of crack bridging and microstructural parameters. In this paper a novel approach is proposed for the assessment of the effective crack bridging toughening from combining destructive and non-destructive test methods. Fracture toughness values were determined applying chevron notched specimen technique and surface damage of the specimen was monitored by image analysis. Different cordierite-mullite compositions characterized by different microstructure morphologies and crack propagation behaviour were investigated. A brief discussion about the correlation between thermo-mechanical properties, microstructure, crack propagation behaviour and thermal shock resistance is presented. Moreover, an empirical model able to determine the presence and effectiveness of the viscoelastic crack bridging ligaments acting in the microstructure under thermal shock conditions and their degradation with increasing thermal shock cycles from parameters measured at room temperature is presented.

Klíčová slova

Cordierite mullite; Viscoelastic toughening; Fracture toughness; Image analysis; Fracture mechanics

Autoři

BOCCACCINI, D.; CANNIO, M.; VOLKOV-HUSOVIC, T.; DLOUHÝ, I.; ROMAGNOLI, M.; VERONESI, P.; LEONELLI, C.

Rok RIV

2008

Vydáno

5. 3. 2008

Nakladatel

Elsevier

ISSN

0955-2219

Periodikum

Journal of the European Ceramic Society

Ročník

28

Číslo

10

Stát

Spojené království Velké Británie a Severního Irska

Strany od

1941

Strany do

1951

Strany počet

11

BibTex

@article{BUT48557,
  author="Dino {Boccaccini} and Maria {Cannio} and Tatjana {Volkov-Husovic} and Ivo {Dlouhý} and Marcello {Romagnoli} and Paolo {Veronesi} and Cristina {Leonelli}",
  title="Assessment of viscoelastic crack bridging toughening in refractory materials",
  journal="Journal of the European Ceramic Society",
  year="2008",
  volume="28",
  number="10",
  pages="1941--1951",
  issn="0955-2219"
}