Review of Requirements for the Durability and Damage Tolerance Certification of Additively Manufactured Aircraft Structural Parts and AM Repairs.

Materials (Basel)

Centre of Expertise for Structural Mechanics, Department of Mechanical and Aerospace Engineering, Monash University, Clayton, Victoria 3800, Australia.

Published: March 2020

AI Article Synopsis

  • The USAF has specific requirements for the certification of additively manufactured aircraft parts regarding their durability and damage tolerance, raising new questions about analysis methods.
  • The paper addresses how to analyze crack growth in AM parts by considering factors like residual stresses and the presence of multiple cracks in cold spray repairs and surface braking.
  • It highlights the effectiveness of the Hartman-Schijve variant of the NASGRO crack growth equation in accurately predicting individual crack growth in both repaired specimens and those with surface defects.

Article Abstract

The USAF requirements for the durability and damage tolerance certification for additively manufactured (AM) aircraft structural parts, which are detailed in Structures Bulletin EZ-19-01, raise a number of new and, as yet, unanswered questions. The present paper attempts to address three questions: How to perform a fracture mechanics-based analysis of crack growth in an AM part so as to account for the residual stresses, how to perform a fracture mechanics-based durability analysis of a cold spray repair so as to account for both the induced residual stresses and the presence of multiple co-located cracks, and how to perform a fracture mechanics-based durability analysis of an AM part so as to account for the presence of multiple collocated surface braking cracks. In this context, the present paper reveals the potential of the Hartman-Schijve variant of the NASGRO crack growth equation to accurately predict the growth of each of the individual (collocated) cracks that arose in a cold spray-repaired specimen and in a specimen from a crack that nucleated and grew from a rough surface.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7143087PMC
http://dx.doi.org/10.3390/ma13061341DOI Listing

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