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dc.contributor.authorHughes, Kevin
dc.contributor.authorVignjevic, Rade
dc.contributor.authorCorcoran, Fergal
dc.contributor.authorGulavani, Omkar
dc.contributor.authorDe Vuyst, Tom
dc.contributor.authorCampbell, James
dc.contributor.authorDjordjevic, Nenad
dc.identifier.citationHughes , K , Vignjevic , R , Corcoran , F , Gulavani , O , De Vuyst , T , Campbell , J & Djordjevic , N 2018 , ' Transferring momentum : Novel drop protection concept for mobile devices ' , International Journal of Impact Engineering , vol. 117 , pp. 85-101 .
dc.identifier.otherPURE: 17389534
dc.identifier.otherPURE UUID: e9270e1b-7591-4760-b8bc-84cdd318402b
dc.identifier.otherScopus: 85044099001
dc.identifier.otherORCID: /0000-0002-4372-4055/work/62752254
dc.description© 2018 The Authors. Published by Elsevier Ltd.
dc.description.abstractDropping a tablet (or mobile phone) can be extremely costly, as loss of functionality, visible body damage, screen delamination and failure are all too familiar outcomes. This paper discusses the analysis led design of a novel passive protection concept, capable of isolating a device from the primary impact, and is also insensitive to impact angle and device dependent features. A high fidelity finite element model of an iPad Air was used to develop the BLOKTM protection concept, which utilises different grades of elastomer, optimised internal castellation geometry and a high stiffness backplate. Sensitivity studies include the influence of glass properties, screen bonding and impact angle on the robustness of the numerical predictions, whereby quantitative comparisons with experimental data in terms of metal body damage (location, size) and accelerometer data were used. Explicit finite element analysis verifies the effectiveness of decoupling the tablet from the impact loads, as resultant acceleration for unprotected versus protected was reduced by ∼76% (2152 g vs 509 g), and consistent with ∼74% reduction observed through testing (1723 g vs 447 g). For the protected tablet, simulation predicted displacements within 6%, with peak acceleration overestimated by 14%, and attributed to overestimating elastomer stiffness at full compression and its subsequent unloading. Final validation demonstrated device independence by protecting an iPad Air 2™ (with significantly different internal structure to Air™), against corner and short edge impacts. The concept developed resulted in a product to market with a mass of 165 g (∼36% tablet mass), providing protection from a 1.8 m drop onto concrete, far exceeding MIL-STD-810G requirements.en
dc.relation.ispartofInternational Journal of Impact Engineering
dc.subjectDrop impact simulation
dc.subjectImpact tolerance of portable electronic devices
dc.subjectProtection concept development
dc.subjectVirtual Design/Testing of Protective Packaging
dc.subjectCivil and Structural Engineering
dc.subjectAutomotive Engineering
dc.subjectAerospace Engineering
dc.subjectSafety, Risk, Reliability and Quality
dc.subjectOcean Engineering
dc.subjectMechanics of Materials
dc.subjectMechanical Engineering
dc.titleTransferring momentum : Novel drop protection concept for mobile devicesen
dc.contributor.institutionDepartment of Engineering and Technology
dc.contributor.institutionSchool of Physics, Engineering & Computer Science
dc.description.statusPeer reviewed
rioxxterms.typeJournal Article/Review

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