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,...

Full description

Bibliographic Details
Main Authors: Kaitlynn M. Conway, Cody Kunka, Benjamin C. White, Garrett J. Pataky, Brad L. Boyce
Format: Article
Language:English
Published: Elsevier 2021-07-01
Series:Materials & Design
Subjects:
Online Access:http://www.sciencedirect.com/science/article/pii/S0264127521002483
_version_ 1798032967062257664
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
work_keys_str_mv AT kaitlynnmconway increasingfracturetoughnessviaarchitectedporosity
AT codykunka increasingfracturetoughnessviaarchitectedporosity
AT benjamincwhite increasingfracturetoughnessviaarchitectedporosity
AT garrettjpataky increasingfracturetoughnessviaarchitectedporosity
AT bradlboyce increasingfracturetoughnessviaarchitectedporosity