Publication detail

What is the tensile strength of a ceramic to be used in numerical models for predicting crack initiation?

LEGUILLON, D. MARTIN, É. ŠEVEČEK, O. BERMEJO, R.

Original Title

What is the tensile strength of a ceramic to be used in numerical models for predicting crack initiation?

Type

journal article in Web of Science

Language

English

Original Abstract

Criteria for predicting initiation of cracks in brittle materials like ceramics are based on two parameters: the material fracture toughness and the tensile strength. Standardized experiments exist to estimate the former. However, the tensile strength is often taken from experiments (mainly uniaxial bending) on specimens with various geometries and surface finish, usually tested under ambient conditions at a given loading rate. The reported strength is commonly the Weibull characteristic strength, which scatters due to the critical defect size distribution on the tested specimen. In this work, we propose a definition of the “inherent” or “intrinsic” tensile strength to be used in numerical models, making a distinction between extrinsic defects due to manufacturing and intrinsic ones relying on the microstructure. Our approach is based on the Finite Fracture Mechanics theory and the Coupled Criterion applied to small surface flaws and its influence on the measured (extrinsic) strength. Numerical results are compared with experiments on alumina reported in the literature. In addition, a model for the Petch law (strength vs. grain size) in polycrystalline materials is proposed using the Coupled Criterion, which predicts an initial crack length of increasing numbers of grains as the grain size decreases.

Keywords

Ceramics; Crack initiation; Finite fracture mechanics; Coupled criterion; Tensile strength

Authors

LEGUILLON, D.; MARTIN, É.; ŠEVEČEK, O.; BERMEJO, R.

Released

5. 7. 2018

Publisher

Springer

Location

Netherlands

ISBN

0376-9429

Periodical

INTERNATIONAL JOURNAL OF FRACTURE

Year of study

212

Number

1

State

Kingdom of the Netherlands

Pages from

89

Pages to

103

Pages count

15

URL

https://link.springer.com/article/10.1007%2Fs10704-018-0294-7

BibTex

@article{BUT149055,
  author="Dominique {Leguillon} and Éric {Martin} and Oldřich {Ševeček} and Raul {Bermejo}",
  title="What is the tensile strength of a ceramic to be used in numerical models for predicting crack initiation?",
  journal="INTERNATIONAL JOURNAL OF FRACTURE",
  year="2018",
  volume="212",
  number="1",
  pages="89--103",
  doi="10.1007/s10704-018-0294-7",
  issn="0376-9429",
  url="https://link.springer.com/article/10.1007%2Fs10704-018-0294-7"
}