CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Damage shielding mechanisms in hierarchical composites in nature with potential for design of tougher structural materials
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics.ORCID iD: 0000-0002-0034-3703
2019 (English)In: Royal Society Open Science, E-ISSN 2054-5703, Vol. 6, no 3, article id 181733Article in journal (Refereed) Published
Abstract [en]

Load-carrying materials in nature, such as wood and bone, consist of relatively simple building blocks assembled into a hierarchical structure, ranging from the molecular scale up to the macroscopic level. This results in composites with a combination of high strength and high toughness, showing very large fracture surfaces indicating energy dissipation by cracking on multiple length scales. Man-made composites instead consist typically of fibres embedded in a uniform matrix, and frequently show brittle failure through the growth of critical clusters of broken fibres. In this paper, a hierarchical structure inspired by wood is presented. It is designed to incapacitate cluster growth, with the aim of retaining high strength. This is done by introducing new structural levels of successively weaker interfaces with the purpose of reducing the stress concentrations if large clusters appear. To test this hypothesis, a probability density field of further damage growth has been calculated for different microstructures and initial crack sizes. The results indicate that the hierarchical structure should maintain its strength by localization of damage, yet rendering large clusters less harmful by weakening the resulting stress concentration to its surroundings, which would lead to an increase in strain to failure. In this context, the potential of using the biomimetic hierarchical structure in design of composite materials is discussed.

Place, publisher, year, edition, pages
2019. Vol. 6, no 3, article id 181733
Keywords [en]
hierarchical structure, biomimetic, microstructure, shielding, composite, micromechanics
National Category
Composite Science and Engineering
Identifiers
URN: urn:nbn:se:uu:diva-383879DOI: 10.1098/rsos.181733ISI: 000465470300046PubMedID: 31032029OAI: oai:DiVA.org:uu-383879DiVA, id: diva2:1323487
Funder
Swedish Research Council, 2016-04534Available from: 2019-06-12 Created: 2019-06-12 Last updated: 2019-06-12Bibliographically approved

Open Access in DiVA

fulltext(1243 kB)7 downloads
File information
File name FULLTEXT01.pdfFile size 1243 kBChecksum SHA-512
e334ed03e5fc244499585d9a9dc6d20dd73535849fdf8f7f93c3531af07a87cd054051c91348b7d13c185bb02365acb67147a4448142361dacfc92dcc661d661
Type fulltextMimetype application/pdf

Other links

Publisher's full textPubMed

Search in DiVA

By author/editor
Gamstedt, E. Kristofer
By organisation
Applied Mechanics
In the same journal
Royal Society Open Science
Composite Science and Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 7 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
pubmed
urn-nbn

Altmetric score

doi
pubmed
urn-nbn
Total: 10 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf