Article available under the terms of the CC-BY-NC-ND licence (https://creativecommons.org/licenses/by-nc-nd/4.0/) eprints@whiterose.ac.uk https://eprints.whiterose.ac.uk/ Reuse Unless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website.
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Energy absorption in lattice structures in dynamics:Experiments lattices investigated to achieve this.
Electron Beam Melting (EBM) is an AdditiveManufacturing technique which can be used to fabricate complex structures from alloys such as Ti6Al4V, for example for orthopaedic applications. Here we describe the use of EBM for the fabrication of a novel Ti6Al4V structure of a regular diamond lattice incorporating graded porosity, achieved via changes in the strut cross section thickness. Scanning Electron Microscopy and micro computed tomography analysis confirmed that generally EBM reproduced the CAD design of the lattice well, although at smaller strut sizes the fabricated lattice produced thicker struts than the model. Mechanical characterisation of the lattice in uniaxial compression showed that its behaviour under compression along the direction of gradation can be predicted to good accuracy with a simple rule of mixtures approach, knowing the properties and the behaviour of its constituent layers.
An investigation on the additive manufacturing and the experimental testing of 3D models of tensegrity\ud
prisms and columns is presented. An Electron Beam Melting facility (Arcam EBM S12) is employed to 3D\ud
print structures composed of tensegrity prisms endowed with rigid bases and temporary supports, which\ud
are made out of the titanium alloy Ti6Al4V. The temporary supports are removed after the additive man-\ud
ufacturing phase, when Spectra cross-strings are added to the 3D printed models, and a suitable state of\ud
internal prestress is applied to the structure. The experimental part of the study shows that the examined\ud
structures feature stiffening-type elastic response under large or moderately large axial strains induced\ud
by compressive loading. Such a geometrically nonlinear behavior confirms previous theoretical results\ud
available in the literature, and paves the way to the use of tensegrity prisms and columns as innovative\ud
mechanical metamaterials and smart devices
more authors) (2015) The effect of density and feature size on mechanical properties of isostructural metaffic foams produced by additive manufacturing. Acta Materialia, 85. 387 -395. ISSN 1359-6454 https://doi.org/10.1016/j.actamat. 2014.10.058 Article available under the terms of the CC-BY-NC-ND licence (https://creativecommons.org/licenses/by-nc-nd/4.0/) eprints@whiterose.ac.uk https://eprints.whiterose.ac.uk/ Reuse Unless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website.
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1The effect of density and feature size on mechanical properties of isostructural porous metals produced by additive manufacturing suggest that surface defects means the minimum size of features that can be created by EBM with similar strength to machined samples is around 1mm.
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