Fracture of laser powder bed fusion additively manufactured Ti–6Al–4V under multiaxial loading

Calibration and comparison of fracture models

Alexander E. Wilson-Heid, Allison Michelle Beese

Research output: Contribution to journalArticle

Abstract

The fracture behavior of laser powder bed fusion (L-PBF) additively manufactured Ti–6Al–4V alloy manufactured in two orientations was investigated using a combined experimental and computational simulation approach. To quantify the effect of stress state on fracture of L-PBF Ti–6Al–4V, mechanical tests subjecting the material to seven distinct stress states were performed. For each test performed, computational simulations were used to determine the evolution of plastic strain and the stress state parameters stress triaxiality and Lode angle parameter up to fracture. Six existing fracture criteria were calibrated, and their ability to capture and/or predict the fracture behavior over a wide range of stress states was evaluated. It was determined that fracture models that explicitly take into account the effects of both the stress triaxiality and Lode angle parameter more accurately captured the multiaxial failure behavior of L-PBF Ti–6Al–4V compared to models that consider no stress state-dependence or only a dependence on stress triaxiality. Additionally, samples loaded in the vertical build direction had a higher ductility than corresponding samples loaded perpendicular to the vertical build direction. The stress state-dependent fracture behavior of L-PBF Ti–6Al–4V quantified in this study highlights the importance of experimentally measuring the fracture behavior of this material under a range of stress states that could be accessed during service, and defining appropriate models to prevent failure in components.

Original languageEnglish (US)
Article number137967
JournalMaterials Science and Engineering A
Volume761
DOIs
StatePublished - Jul 22 2019

Fingerprint

Powders
beds
Fusion reactions
fusion
Calibration
Lasers
lasers
triaxial stresses
titanium alloy (TiAl6V4)
ductility
Ductility
Plastic deformation
plastics
simulation

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

@article{9e0863593a924587941538258faccef0,
title = "Fracture of laser powder bed fusion additively manufactured Ti–6Al–4V under multiaxial loading: Calibration and comparison of fracture models",
abstract = "The fracture behavior of laser powder bed fusion (L-PBF) additively manufactured Ti–6Al–4V alloy manufactured in two orientations was investigated using a combined experimental and computational simulation approach. To quantify the effect of stress state on fracture of L-PBF Ti–6Al–4V, mechanical tests subjecting the material to seven distinct stress states were performed. For each test performed, computational simulations were used to determine the evolution of plastic strain and the stress state parameters stress triaxiality and Lode angle parameter up to fracture. Six existing fracture criteria were calibrated, and their ability to capture and/or predict the fracture behavior over a wide range of stress states was evaluated. It was determined that fracture models that explicitly take into account the effects of both the stress triaxiality and Lode angle parameter more accurately captured the multiaxial failure behavior of L-PBF Ti–6Al–4V compared to models that consider no stress state-dependence or only a dependence on stress triaxiality. Additionally, samples loaded in the vertical build direction had a higher ductility than corresponding samples loaded perpendicular to the vertical build direction. The stress state-dependent fracture behavior of L-PBF Ti–6Al–4V quantified in this study highlights the importance of experimentally measuring the fracture behavior of this material under a range of stress states that could be accessed during service, and defining appropriate models to prevent failure in components.",
author = "Wilson-Heid, {Alexander E.} and Beese, {Allison Michelle}",
year = "2019",
month = "7",
day = "22",
doi = "10.1016/j.msea.2019.05.097",
language = "English (US)",
volume = "761",
journal = "Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing",
issn = "0921-5093",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Fracture of laser powder bed fusion additively manufactured Ti–6Al–4V under multiaxial loading

T2 - Calibration and comparison of fracture models

AU - Wilson-Heid, Alexander E.

AU - Beese, Allison Michelle

PY - 2019/7/22

Y1 - 2019/7/22

N2 - The fracture behavior of laser powder bed fusion (L-PBF) additively manufactured Ti–6Al–4V alloy manufactured in two orientations was investigated using a combined experimental and computational simulation approach. To quantify the effect of stress state on fracture of L-PBF Ti–6Al–4V, mechanical tests subjecting the material to seven distinct stress states were performed. For each test performed, computational simulations were used to determine the evolution of plastic strain and the stress state parameters stress triaxiality and Lode angle parameter up to fracture. Six existing fracture criteria were calibrated, and their ability to capture and/or predict the fracture behavior over a wide range of stress states was evaluated. It was determined that fracture models that explicitly take into account the effects of both the stress triaxiality and Lode angle parameter more accurately captured the multiaxial failure behavior of L-PBF Ti–6Al–4V compared to models that consider no stress state-dependence or only a dependence on stress triaxiality. Additionally, samples loaded in the vertical build direction had a higher ductility than corresponding samples loaded perpendicular to the vertical build direction. The stress state-dependent fracture behavior of L-PBF Ti–6Al–4V quantified in this study highlights the importance of experimentally measuring the fracture behavior of this material under a range of stress states that could be accessed during service, and defining appropriate models to prevent failure in components.

AB - The fracture behavior of laser powder bed fusion (L-PBF) additively manufactured Ti–6Al–4V alloy manufactured in two orientations was investigated using a combined experimental and computational simulation approach. To quantify the effect of stress state on fracture of L-PBF Ti–6Al–4V, mechanical tests subjecting the material to seven distinct stress states were performed. For each test performed, computational simulations were used to determine the evolution of plastic strain and the stress state parameters stress triaxiality and Lode angle parameter up to fracture. Six existing fracture criteria were calibrated, and their ability to capture and/or predict the fracture behavior over a wide range of stress states was evaluated. It was determined that fracture models that explicitly take into account the effects of both the stress triaxiality and Lode angle parameter more accurately captured the multiaxial failure behavior of L-PBF Ti–6Al–4V compared to models that consider no stress state-dependence or only a dependence on stress triaxiality. Additionally, samples loaded in the vertical build direction had a higher ductility than corresponding samples loaded perpendicular to the vertical build direction. The stress state-dependent fracture behavior of L-PBF Ti–6Al–4V quantified in this study highlights the importance of experimentally measuring the fracture behavior of this material under a range of stress states that could be accessed during service, and defining appropriate models to prevent failure in components.

UR - http://www.scopus.com/inward/record.url?scp=85068088452&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85068088452&partnerID=8YFLogxK

U2 - 10.1016/j.msea.2019.05.097

DO - 10.1016/j.msea.2019.05.097

M3 - Article

VL - 761

JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

SN - 0921-5093

M1 - 137967

ER -