Crack Initiation

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Crack initiation

Initiation of a crack

Crack initiation is essentially the transition from a stationary crack to a moving crack. Starting from microdefects in the material volume, the resulting stress concentrations cause the fracture strength to be exceeded locally, thereby initiating a crack [1–2]. This is followed either by crack propagation or crack arrest. Crack initiation is often preceded by crack blunting (see also: fracture mechanics and crack resistance curve).

Fracture mechanics testing makes it possible to determine characteristic values that can be used to characterise the material's resistance to crack initiation [3].

See also

• Crack
• Fracture formation
• Crack propagation
• Fracture
• Fracture mechanics
• Notch

References

[1]	Blumenauer, H., Pusch, G.: Technische Bruchmechanik. Deutscher Verlag für Grundstoffindustrie, Leipzig Stuttgart (1993) 3rd Edition, (ISBN 3-342-00659-5; see AMK-Library under A 29-3)
[2]	Anderson, T. L.: Fracture Mechanics; Fundamentals and Applications. CRC Press, Boca Raton (2005) 3rd Edition, (ISBN 978-0849342608; see AMK-Library under E 8-2); https://doi.org/10.1201/9781315370293
[3]	Grellmann, W., Seidler, S. (Eds.): Polymer Testing. Carl Hanser, Munich (2022) 3rd Edition, pp. 236–239, (ISBN 978-1-56990-806-8; e-book 978-1-56990-807-5; see AMK-Library under A 22)