Increasing fracture toughness via architected porosity
Fracture toughness, rather than strength, is often the limiting factor of structural materials. Developing new base materials with improved fracture toughness often takes more than a decade. Alternatively, topological design has recently been expanded by additive manufacturing. In the present study,...
Main Authors: | , , , , |
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Format: | Article |
Language: | English |
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Elsevier
2021-07-01
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Series: | Materials & Design |
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Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127521002483 |
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author | Kaitlynn M. Conway Cody Kunka Benjamin C. White Garrett J. Pataky Brad L. Boyce |
author_facet | Kaitlynn M. Conway Cody Kunka Benjamin C. White Garrett J. Pataky Brad L. Boyce |
author_sort | Kaitlynn M. Conway |
collection | DOAJ |
description | Fracture toughness, rather than strength, is often the limiting factor of structural materials. Developing new base materials with improved fracture toughness often takes more than a decade. Alternatively, topological design has recently been expanded by additive manufacturing. In the present study, architected planes of internal porosity mimicking a weak interface were found capable of arresting and deflecting a propagating crack, delaying fracture. This concept was demonstrated experimentally in solid beams of polymeric 3D printed material, and in gyroid metamaterials constructed from either a brittle polymer or stainless steel. Improvements in fracture toughness ranged from 22% to 300% depending on the material. Especially with topological optimization, toughening via designed porosity provides an avenue for cost-effective and simple toughening across a range of materials. |
first_indexed | 2024-04-11T20:22:51Z |
format | Article |
id | doaj.art-793d034d2d7a49899840efafc5452319 |
institution | Directory Open Access Journal |
issn | 0264-1275 |
language | English |
last_indexed | 2024-04-11T20:22:51Z |
publishDate | 2021-07-01 |
publisher | Elsevier |
record_format | Article |
series | Materials & Design |
spelling | doaj.art-793d034d2d7a49899840efafc54523192022-12-22T04:04:46ZengElsevierMaterials & Design0264-12752021-07-01205109696Increasing fracture toughness via architected porosityKaitlynn M. Conway0Cody Kunka1Benjamin C. White2Garrett J. Pataky3Brad L. Boyce4Department of Mechanical Engineering, Clemson University, Clemson, SC 29634, USACenter for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, NM 87185, USACenter for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, NM 87185, USADepartment of Mechanical Engineering, Clemson University, Clemson, SC 29634, USACenter for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, NM 87185, USA; Corresponding author.Fracture toughness, rather than strength, is often the limiting factor of structural materials. Developing new base materials with improved fracture toughness often takes more than a decade. Alternatively, topological design has recently been expanded by additive manufacturing. In the present study, architected planes of internal porosity mimicking a weak interface were found capable of arresting and deflecting a propagating crack, delaying fracture. This concept was demonstrated experimentally in solid beams of polymeric 3D printed material, and in gyroid metamaterials constructed from either a brittle polymer or stainless steel. Improvements in fracture toughness ranged from 22% to 300% depending on the material. Especially with topological optimization, toughening via designed porosity provides an avenue for cost-effective and simple toughening across a range of materials.http://www.sciencedirect.com/science/article/pii/S0264127521002483Fracture toughnessGyroidCrack pathAdditive manufacturing |
spellingShingle | Kaitlynn M. Conway Cody Kunka Benjamin C. White Garrett J. Pataky Brad L. Boyce Increasing fracture toughness via architected porosity Materials & Design Fracture toughness Gyroid Crack path Additive manufacturing |
title | Increasing fracture toughness via architected porosity |
title_full | Increasing fracture toughness via architected porosity |
title_fullStr | Increasing fracture toughness via architected porosity |
title_full_unstemmed | Increasing fracture toughness via architected porosity |
title_short | Increasing fracture toughness via architected porosity |
title_sort | increasing fracture toughness via architected porosity |
topic | Fracture toughness Gyroid Crack path Additive manufacturing |
url | http://www.sciencedirect.com/science/article/pii/S0264127521002483 |
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