TY - JOUR
T1 - Further studies into crack growth in additively manufactured materials
AU - Iliopoulos, Athanasios P.
AU - Jones, Rhys
AU - Michopoulos, John G.
AU - Phan, Nam
AU - Rans, Calvin
PY - 2020/5/1
Y1 - 2020/5/1
N2 - 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).
AB - 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).
KW - Additive manufacture
KW - Aircraft sustainment
KW - Fatigue
KW - MIL-STD-1530D
KW - Structures Bulletin EZ-SB-19-01
UR - http://www.scopus.com/inward/record.url?scp=85085544134&partnerID=8YFLogxK
U2 - 10.3390/ma13102223
DO - 10.3390/ma13102223
M3 - Article
AN - SCOPUS:85085544134
VL - 13
JO - Materials
JF - Materials
SN - 1996-1944
IS - 10
M1 - 2223
ER -