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3. Measurement of critical energy restitution rate
3.1 The complacency method
To determine the critical energy restitution rate of a crack G c , we need to design a test that will cause it to propagate, and measure the energy dissipated by this propagation. Let's imagine such a test with a force F applied at one point on the structure and the resulting displacement u at the same point. To calculate the work applied to the structure, we need to ensure that only the work of this force F is supplied to the structure, which is generally the case, as there are many other forces applied at the level of the embedding conditions, but as at the same time the displacements are zero, the corresponding work will also be zero. The work of external forces, W ext ...
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Measurement of critical energy restitution rate
Interface delamination
Bibliography
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).
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