Computing the Durability of WAAM 18Ni-250 Maraging Steel Specimens with Surface Breaking Porosity

The durability assessment of additively manufactured parts needs to account for both surface-breaking material discontinuities and surface-breaking porosity and how these material discontinuities interact with parts that have been left in the as-built state. Furthermore, to be consistent with the ai...

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Bibliographic Details
Published inCrystals (Basel) Vol. 13; no. 3; p. 443
Main Authors Peng, Daren, Champagne, Victor K., Ang, Andrew S. M., Birt, Aaron, Michelson, Alex, Pinches, Sam, Jones, Rhys
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.03.2023
Subjects
Aging aircraft
Aircraft
Aircraft reliability
Analysis
Breaking
crack growth
Crack propagation
Cracks
Discontinuity
Durability
EIDS
Fracture mechanics
Load
Maraging steels
Metal fatigue
Military aircraft
Parameters
Porosity
Surface roughness
WAAM
Wire industry
Australia
United States > US
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Summary:The durability assessment of additively manufactured parts needs to account for both surface-breaking material discontinuities and surface-breaking porosity and how these material discontinuities interact with parts that have been left in the as-built state. Furthermore, to be consistent with the airworthiness standards associated with the certification of metallic parts on military aircraft the durability analysis must be able to predict crack growth, as distinct from using a crack growth analysis in which parameters are adjusted so as to match measured data. To partially address this, the authors recently showed how the durability of wire arc additively manufactured (WAAM) 18Ni-250 maraging steel specimens, where failure was due to the interaction of small surface-breaking cracks with surface roughness, could be predicted using the Hartman–Schijve variant of the NASGRO crack growth equation. This paper illustrates how the same equation, with the same material parameters, can be used to predict the durability of a specimen where failure is due to surface-breaking porosity.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst13030443