Ubaid, J., Wardle, B. L. and Kumar, S. (2018) Strength and performance enhancement of multilayers by spatial tailoring of adherend compliance and morphology via multimaterial jetting additive manufacturing. Scientific Reports, 8, 13592. (doi: 10.1038/s41598-018-31819-2) (PMID:30206331) (PMCID:PMC6134147)
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Abstract
Material tailoring of bondlayer compliance is a known effective route to enhance performance of multilayers, and here spatial material-tailoring of compliance and morphology of the adherends is examined. Multimaterial jetting additive manufacturing (AM) allows us to realize for the first time compliance- and morphology-tailored adherends, and evaluate directly the mechanical performance, including failure, of the tensile-loaded multilayers. Adherend compliance-tailoring, unlike bondlayer tailoring, requires additional consideration due to adherend bending stiffness and moment influences on bondlayer stresses. We introduce anisotropic as well as layered/sandwich adherend tailoring to address this dependence. Numerical models show that for both sub-critical and critical bondlengths (at which shear-dominated load transfer occurs through the bondlayer), adherend tailoring reduces peak stresses significantly, particularly peel stress (reductions of 47–80%) that typically controls failure in such systems. At sub-critical bondlengths, the AM-enabled layered/sandwich adherend tailoring shows significantly increased experimental performance over the baseline multilayer: strength is increased by 20%, toughness by 48%, and strain-to-break by 18%, while retaining multilayer stiffness. The adherend tailoring demonstrated here adds to the techniques available to increase the performance of bonded multilayers, suggesting that adherend tailoring is particularly well-suited to additively manufactured multilayers, but can also have application in other areas such as layered electronics and advanced structural composite laminates.
Item Type: | Articles |
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Additional Information: | We gratefully acknowledge financial support from the Abu Dhabi National Oil Company (ADNOC) under Award No: EX2016–000010. |
Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Kumar, Professor Shanmugam |
Authors: | Ubaid, J., Wardle, B. L., and Kumar, S. |
College/School: | College of Science and Engineering > School of Engineering > Systems Power and Energy |
Journal Name: | Scientific Reports |
Publisher: | Nature Research |
ISSN: | 2045-2322 |
ISSN (Online): | 2045-2322 |
Copyright Holders: | Copyright © The Author(s) 2018 |
First Published: | First published in Scientific Reports 8:13592 |
Publisher Policy: | Reproduced under a Creative Commons licence |
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