Further studies into crack growth in additively manufactured materials

Iliopoulos, Athanasios P.; Jones, Rhys; Michopoulos, John G.; Phan, Nam; Rans, C.D.

doi:10.3390/ma13102223

Further studies into crack growth in additively manufactured materials

Title

Further studies into crack growth in additively manufactured materials

Author

Iliopoulos, Athanasios P. (Naval Research Laboratory)
Jones, Rhys (Monash University)
Michopoulos, John G. (Naval Research Laboratory)
Phan, Nam (Naval Air Systems Command)
Rans, C.D. (TU Delft Structural Integrity & Composites)

Date

2020-05-01

Abstract

Understanding and characterizing crack growth is central to meeting the damage tolerance and durability requirements delineated in USAF Structures Bulletin EZ-SB-19-01 for the utilization of additive manufacturing (AM) in the sustainment of aging aircraft. In this context, the present paper discusses the effect of differentAMprocesses, different build directions, and the variability in the crack growth rates related to AM Ti-6Al-4V, AM Inconel 625, and AM 17-4 PH stainless steel. This study reveals that crack growth in these three AM materials can be captured using the Hartman-Schijve crack growth equation and that the variability in the various da/dN versus DK curves can be modeled by allowing the terms DKthr and A to vary. It is also shown that for the AM Ti-6AL-4V processes considered, the variability in the cyclic fracture toughness appears to be greatest for specimens manufactured using selective layer melting (SLM).

Subject

Additive manufacture
Aircraft sustainment
Fatigue
MIL-STD-1530D
Structures Bulletin EZ-SB-19-01

To reference this document use:

http://resolver.tudelft.nl/uuid:0110ccf9-dc08-4355-9b60-3962dede89d0

DOI

https://doi.org/10.3390/ma13102223

ISSN

1996-1944

Source

Materials, 13 (10)

Part of collection

Institutional Repository