The physically short crack regime is primary region of interest in the design and sustainment of highly optimised metallic aircraft. It has been previously shown that by characterising a fracture surface using fractals concept produces a crack growth model similar to that first proposed by Frost and Dugdale in 1958. This provides a scientific basis to the crack growth model. Further investigations revealed that for short cracks these models predict that crack growth is exponentially related to the applied load history. This observation has led to a practical aircraft lifing approach applicable to the short crack regime known as the lead crack framework. This paper summarises the fractality of metallic fracture surfaces, presents examples of the crack growth behaviour in complex structures, and summarises some useful crack growth tools.
From fractals to the lead crack airframe lifing framework / Molent, L.; Spagnoli, A.; Carpinteri, A.; Jones, R.. - 1:(2017), pp. 773-774. (Intervento presentato al convegno 14th International Conference on Fracture, ICF 2017 tenutosi a grc nel 2017).
From fractals to the lead crack airframe lifing framework
Spagnoli A.;Carpinteri A.;
2017-01-01
Abstract
The physically short crack regime is primary region of interest in the design and sustainment of highly optimised metallic aircraft. It has been previously shown that by characterising a fracture surface using fractals concept produces a crack growth model similar to that first proposed by Frost and Dugdale in 1958. This provides a scientific basis to the crack growth model. Further investigations revealed that for short cracks these models predict that crack growth is exponentially related to the applied load history. This observation has led to a practical aircraft lifing approach applicable to the short crack regime known as the lead crack framework. This paper summarises the fractality of metallic fracture surfaces, presents examples of the crack growth behaviour in complex structures, and summarises some useful crack growth tools.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
