Crack growth in D6ac steel structural components

R. Jones, Scott C Forth

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Cracking in D6ac steel has played a key role in the development of the damage tolerant design philosophy. Until recently it had been thought that cracking in D6ac steel was well understood. However, Forth et. al. [1] have recently reported that crack growth data obtained by NASA for D6ac steel revealed that there was little R ratio dependence in the Paris Region and that there was thus little, if any, crack closure. In this paper we reveal how the NASA data conforms to the Generalised Frost-Dugdale crack growth law. We then show how the average block variant of the Generalised Frost-Dugdale law can be used to predict the growth of small cracks in a USAF study into crack growth in D6ac steel specimens representative of the critical region of F-111 wing pivot fitting.

Original languageEnglish
Title of host publication12th International Congress on Fracture 2009, ICF-12
Number of pages8
Publication statusPublished - 2009
EventInternational Congress on Fracture 2009 - Ottawa, Canada
Duration: 12 Jul 200917 Jul 2009
Conference number: 12th


ConferenceInternational Congress on Fracture 2009
Abbreviated titleICF 2009

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