Mechanical coupling and tuned anisotropic elasticity: Numerical and experimental material design for shear-normal and shear-shear interactions

[Display omitted] •A highly anisotropic architectured material with mechanical coupling is investigated.•Coupling parameters are numerically and experimentally quantified.•Material anisotropy is identified using elastic distance function.•Material behavior is characterized through elastic and elasto...

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Bibliographic Details
Published in:Materials & design Vol. 230; p. 111950
Main Authors: Molavitabrizi, Danial, Suzuki, Asuka, Kobashi, Makoto, Mousavi, S. Mahmoud
Format: Journal Article
Language:English
Published: Elsevier Ltd 01.06.2023
Elsevier
Subjects:
Additive manufacturing
Anisotropic elasticity
Engineering Science with specialization in Solid Mechanics
Lattice materials
Shear-normal coupling
Shear-shear coupling
Teknisk fysik med inriktning mot hållfasthetslära
Trigonal symmetry
Anisotropic elasticity
Shear-normal coupling
Shear-shear coupling
Lattice materials
Additive manufacturing
Trigonal symmetry
ISSN:0264-1275, 1873-4197, 1873-4197
Online Access:Get full text
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Summary:[Display omitted] •A highly anisotropic architectured material with mechanical coupling is investigated.•Coupling parameters are numerically and experimentally quantified.•Material anisotropy is identified using elastic distance function.•Material behavior is characterized through elastic and elastoplastic homogenization.•Elastic anisotropy in various directions is numerically and experimentally evaluated. Mechanical coupling in architectured materials has been traditionally investigated in the context of generalized continuum mechanics and is often assumed to be non-existent in the framework of classical continuum mechanics. In this paper, we challenge this misconception and study an anisotropic architectured material exhibiting shear-shear and shear-normal coupling from the standpoint of classical continuum mechanics. The material is non-regular tetrahedron lattice, a potential candidate for biomedical implants, but the lack of understanding about its anisotropic behavior and mechanical couplings has limited its application. We exploited the unit-cell definition with periodic boundary conditions and performed elastic and elastoplastic homogenizations. Non-zero coupling sub-matrices appeared in the homogenized elasticity matrix, which we further transformed into material’s natural coordinate system using elastic distance function. This allowed for anisotropy identification and determination of all the coupling parameters. Next, compression tests are conducted on laser powder bed fused Al-12Si (mass%) lattice samples with different relative densities and spatial orientations. Employing test data, mechanical anisotropy and shear-normal couplings are experimentally characterized. Both numerical and experimental results confirmed the presence of mechanical couplings and predicted a similar anisotropic tendency in the material. Finally, the role of manufacturing defects in deterioration of as-designed mechanical properties is discussed.
ISSN:0264-1275
1873-4197
1873-4197
DOI:10.1016/j.matdes.2023.111950