Further studies into crack growth in additively manufactured materials

Athanasios P. Iliopoulos; Rhys Jones; John G. Michopoulos; Nam Phan; Calvin Rans

doi:10.3390/ma13102223

Further studies into crack growth in additively manufactured materials

Athanasios P. Iliopoulos, Rhys Jones^*, John G. Michopoulos, Nam Phan, Calvin Rans

^*Corresponding author for this work

Structural Integrity & Composites

Research output: Contribution to journal › Article › Scientific › peer-review

28 Citations (Scopus)

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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).

Original language	English
Article number	2223
Number of pages	18
Journal	Materials
Volume	13
Issue number	10
DOIs	https://doi.org/10.3390/ma13102223
Publication status	Published - 1 May 2020

Keywords

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

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10.3390/ma13102223

materials-13-02223-v2Final published version, 4.13 MBLicence: CC BY

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title = "Further studies into crack growth in additively manufactured materials",

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).",

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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).

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KW - Aircraft sustainment

KW - Fatigue

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Further studies into crack growth in additively manufactured materials

Abstract

Keywords

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