3. Translaminar fracture toughness in composites

3.1 0° ply fracture toughness versus laminate fracture toughness

As previously mentioned, toughness in multidirectional laminates depends significantly on the orientation of the fibers within each ply. Ideally, we should be able to determine the toughness of each type of ply, for example 0°, 90°, 45° and – 45° in the standard cases, and then trace the toughness of the laminate back to homogenization. This is the approach adopted in classical laminate theory, which allows us to pass from the stress flows imposed on the laminate to the stresses in each ply

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Translaminar fracture toughness in composites

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page Physics of translaminar fracture in composites

Conclusion

Bibliography

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

Standards and norms

Standard test method for mode I interlaminar fracture toughness of unidirectional continuous fiber reinforced composite materials - ASTM D5528-33 - 2013
Standard test method for measurement of fracture toughness - ASTM E1820-18 - 2018
Standard test method for translaminar fracture toughness of laminated and pultruded polymer matrix composite materials - ASTM E1922-15 - 2015
Standard test method...

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)