Heterogeneities dominate mechanical performance of additively manufactured metal lattice struts

Dressler, Amber Dawn; Jost, Elliott W.; Miers, John Carter; Moore, David G.; Seepersad, Carolyn C.; Boyce, Brad Lee

doi:10.1016/j.addma.2019.06.011

Title: Heterogeneities dominate mechanical performance of additively manufactured metal lattice struts

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Abstract

Architected structural metamaterials, also known as lattice, truss, or acoustic materials, provide opportunities to produce tailored effective properties that are not achievable in bulk monolithic materials. These topologies are typically designed under the assumption of uniform, isotropic base material properties taken from reference databases and without consideration for sub-optimal as-printed properties or off-nominal dimensional heterogeneities. However, manufacturing imperfections such as surface roughness are present throughout the lattices and their constituent struts create significant variability in mechanical properties and part performance. Here, this study utilized a customized tensile bar with a gauge section consisting of five parallel struts loaded in a stretch (tensile) orientation to examine the impact of manufacturing heterogeneities on quasi-static deformation of the struts, with a focus on ultimate tensile strength and ductility.

Authors:

Dressler, Amber Dawn ^[1];

^[2]; Miers, John Carter ^[2]; Moore, David G. ^[2]; Seepersad, Carolyn C. ^[3];

^[2]

The Univ. of Texas at Austin, Austin, TX (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
The Univ. of Texas at Austin, Austin, TX (United States)

Publication Date:: Tue Jun 11 00:00:00 EDT 2019

Research Org.:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1529298

Report Number(s):: SAND-2018-10855J
Journal ID: ISSN 2214-8604; 668406

Grant/Contract Number:: AC04-94AL85000

Resource Type:: Accepted Manuscript

Journal Name:: Additive Manufacturing

Additional Journal Information:: Journal Volume: 28; Journal Issue: C; Journal ID: ISSN 2214-8604

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; Additive manufacturing; Direct metal laser sintering; Lattice; Tensile; Metamaterial; Property variation

Citation Formats


                    Dressler, Amber Dawn, Jost, Elliott W., Miers, John Carter, Moore, David G., Seepersad, Carolyn C., and Boyce, Brad Lee. Heterogeneities dominate mechanical performance of additively manufactured metal lattice struts.  United States: N. p., 2019. 
Web.  doi:10.1016/j.addma.2019.06.011.

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                    Dressler, Amber Dawn, Jost, Elliott W., Miers, John Carter, Moore, David G., Seepersad, Carolyn C., & Boyce, Brad Lee. Heterogeneities dominate mechanical performance of additively manufactured metal lattice struts.  United States.  https://doi.org/10.1016/j.addma.2019.06.011

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                    Dressler, Amber Dawn, Jost, Elliott W., Miers, John Carter, Moore, David G., Seepersad, Carolyn C., and Boyce, Brad Lee. Tue .  
"Heterogeneities dominate mechanical performance of additively manufactured metal lattice struts".  United States.  https://doi.org/10.1016/j.addma.2019.06.011.  https://www.osti.gov/servlets/purl/1529298.

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@article{osti_1529298,

  title        = {Heterogeneities dominate mechanical performance of additively manufactured metal lattice struts},

  author       = {Dressler, Amber Dawn and Jost, Elliott W. and Miers, John Carter and Moore, David G. and Seepersad, Carolyn C. and Boyce, Brad Lee},

  abstractNote = {Architected structural metamaterials, also known as lattice, truss, or acoustic materials, provide opportunities to produce tailored effective properties that are not achievable in bulk monolithic materials. These topologies are typically designed under the assumption of uniform, isotropic base material properties taken from reference databases and without consideration for sub-optimal as-printed properties or off-nominal dimensional heterogeneities. However, manufacturing imperfections such as surface roughness are present throughout the lattices and their constituent struts create significant variability in mechanical properties and part performance. Here, this study utilized a customized tensile bar with a gauge section consisting of five parallel struts loaded in a stretch (tensile) orientation to examine the impact of manufacturing heterogeneities on quasi-static deformation of the struts, with a focus on ultimate tensile strength and ductility.},

  doi          = {10.1016/j.addma.2019.06.011},

  journal      = {Additive Manufacturing},

  number       = C,

  volume       = 28,

  place        = {United States},

  year         = {Tue Jun 11 00:00:00 EDT 2019},

  month        = {Tue Jun 11 00:00:00 EDT 2019}

}

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