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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
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Official URL: http://dx.doi.org/10.3390/app10217738
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 | ||||||
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| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TS Manufactures |
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| Divisions: | Faculty of Science > 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: |
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| 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 |
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