Numerical Investigation into the Effect of Laminated Casing on the Impact Resistance of Smartphone Screens

Document Type: Original Article

Authors

1 Department of Systems Engineering, Faculty of Engineering, University of Lagos, Nigeria.

2 Department of Mechanical and Biomedical Engineering, Bells University of Technology, Ota, Ogun State, Nigeria

10.22115/cepm.2020.184606.1063

Abstract

A survey shows that most smartphones damages are due to frequent falls, owing to their small nature coupled with poor handling. This results in cracked screens to broken parts, to total damage. Although advancements like the gorilla glass which claims to be both scratch and crack resistant have been successful. However, this has only reduced screen damage. The overall effect of high and low-velocity impact on phones has not been reduced. Hence, this study focuses on the impact performance of laminated cellphone casing. The laminate is achieved through force fit of different layers of the lamina. Four laminated scenarios are examined. The impact analyses of single, double, triple, and quadplex layers of the laminate are studied within a drop height of 0.5m - 2.5m and a step size of 0.5m. Various polycarbonate layers of the phone casing are captured as an elastoplastic material model. The assembled model of the phone casing with the screen is achieved through Autodesk Inventor® while Solidworks® drop test module is employed to simulate the different impact conditions. Results from the stress, strain energy, and displacement responses reveal that the number of laminate layers relates inversely to the effect of impact load on the phone screen. The computational outcomes of the present study demonstrate a reasonable agreement with laboratory evidence recorded in the literature.

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