2. Linear fracture mechanics and stress intensity factors

The definition of linear fracture mechanics (LFM) is based on the method used to calculate the "elastic" stress intensity factor under uniform loading. Calculation of the stress intensity factor (SIF), the driving force behind cracking, ultimately enables propagation kinetics to be predicted.

2.1 Definition of linear fracture mechanics

Linear fracture mechanics considers the evolution of a defect modeled by a crack in a structure subjected to external mechanical loading. The geometric representation of a crack and the associated coordinate system used to describe the stress state at the crack tip are shown in figure 4 .

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Linear fracture mechanics and stress intensity factors

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page Important principles of fracture mechanics

Crack propagation modeling

Bibliography

(1) - GRIFFITH (A.A.) - The theory of rupture. - Proceedings of the First International Congress of Applied Mechanics, Delpht, 63, p. 55 (1924).
(2) - WESTERGAARD (H.M) - Bearing pressures and cracks. - Journal of applied mechanics, p. 49,...

Software tools

MorfeoCrack (Cenaero)/plugin for Samcef (LMS-Samtech) http://www.cenaero.be/

DARWIN™ http://www.darwin.swri.org

ESACRACK http://www.esacrack.com

Events

International Conference on Fracture and Damage Mechanics

International Conference on Fatigue Damage of Structural Materials (Hyannis, USA)

Standards and norms

Certification procedures for products and parts advisory circular – Damage tolerance for high energy turbine engine rotors US department of transportation – Federal aviation administration http://www.faa.gov/regulations_policies/advisory_cirulars/index.cfm/go/document.information/documentID/22920 - AC 33.14-1 -
Amendment 1, European aviation safety agency http://www.easa.europa.eu/agency-measures/docs/agency-decisions/2010/2010-015-R/CS-E_amendment%203/pdf...