1. Origin of cracks in composite structures

Composite materials have been increasingly used in structures for many years now. Their good performance/mass ratio makes them a particularly interesting candidate for lightening structures, and it's only natural that composite materials are now the most widely used materials in many aeronautical structures (figure 1 ).

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Origin of cracks in composite structures

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page Fracture Mechanics of Composite : Delamination and Cracking

Fundamentals of fracture mechanics

Bibliography

(1) - BOUVET (C.) - Dimensionnement des structures composites : applications à l'aéronautique. - ISBN : 978-1-78405-348-2, éd. ISTE (2018).
(2) - BERTHELOT (J.M.) - Matériaux composites : comportement mécanique et analyse des structures. -...

Standards and norms

Standard test method for mode I interlaminar fracture toughness of unidirectional continuous fiber reinforced composite materials, ASTM International - ASTM D5528-33 - 2013
Standard test method for plane strain-strain fracture toughness of metallic materials, ASTM International - ASTM E399-90 - 1997

Regulations

Federal Aviation Administration 25 (FAR25) – Advisory Circular 25.571, Damage tolerance and fatigue evaluation of structure (1978).

Joint Airworthiness Requirements 25 (JAR25) – Part 1: Requirements, Part 2: Acceptable means of compliance and interpretations (for composite structures: JAR25 § 25.603 and ACJ 25.603) (1978).