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Additive manufacture of 3D auxetic structures by laser powder bed fusion — design influence on manufacturing accuracy and mechanical properties

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Maran, Sibi, Masters, Iain and Gibbons, Gregory John (2020) Additive manufacture of 3D auxetic structures by laser powder bed fusion — design influence on manufacturing accuracy and mechanical properties. Applied Sciences, 10 (21). 7738. doi:10.3390/app10217738 ISSN 2076-3417.

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Official URL: http://dx.doi.org/10.3390/app10217738

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Abstract

The mechanical response of steel auxetic structures manufactured using laser-powder bed fusion was explored. The level of control exerted by the key design parameters of vertical strut length (H), re-entrant strut length (L), strut thickness (t) and re-entrant angle (ϴ) on the mechanical response was examined through a design of experiment approach with ANOVA statistical analysis methods applied. The elastic modulus in directions normal to (Ex) and parallel to (Ey) the vertical strut was found to be primarily dependent upon t and L, respectively, whereas yield strength in both test directions (σx and σy) was strongly dependent on t and L. A large variation in modulus was found between the two test directions (Ex / Ey – 1.02 ± 0.07 GPa/ 4.4 ± 0.1 GPa), whereas, yield strength showed little anisotropy (σx / σy–45 ± 6 MPa/ 45 ± 9 MPa). Poisson’s ratio parallel to the vertical strut varied considerably with geometry but not in a direction normal to the vertical strut. Deformation mechanisms were found to be different of compression in the x and y directions, being a combination of stretching of the vertical strut; compression, bending and hinging of the re-entrant strut (x); and vertical strut compression and re-entrant strut stretching and bending (y).

Item Type: Journal Article
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TS Manufactures
Divisions: Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH): Additive manufacturing, Materials -- Mechanical properties, Nanostructured materials -- Elastic properties, Nanostructured materials -- Mechanical properties, Computer-aided engineering
Journal or Publication Title: Applied Sciences
Publisher: MDPI
ISSN: 2076-3417
Official Date: 1 November 2020
Dates:
DateEvent
1 November 2020Published
30 October 2020Accepted
Volume: 10
Number: 21
Article Number: 7738
DOI: 10.3390/app10217738
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 1 November 2021
Date of first compliant Open Access: 3 November 2021

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