From fractals to the lead crack airframe lifing framework

L. Molent, Andrea Spagnoli, Andrea Carpinteri, R. Jones

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther


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.

Original languageEnglish
Title of host publicationICF 2017 - 14th International Conference on Fracture
EditorsEmmanuel E. Gdoutos
PublisherInternational Conference on Fracture
Number of pages2
ISBN (Electronic)9780000000002
Publication statusPublished - 2017
EventInternational Conference on Fracture 2017 - Rhodes, Greece
Duration: 18 Jun 201720 Jun 2017
Conference number: 14th


ConferenceInternational Conference on Fracture 2017
Abbreviated titleICF 2017
Internet address

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