Impact on auxetic and metal foams

Khaderi, Syed Nizamuddin and Kumar, Nitish and Rao, Koka Tirumala (2019) Impact on auxetic and metal foams. Vibroengineering PROCEDIA, 29. pp. 255-259. ISSN 2345-0533

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Using the finite element method, we investigate the elasto-plastic impact of a rigid sphere on a half-space of auxetic and metal foams. The validity of the Hertz theory for elastic impacts is investigated for both positive and negative Poisson’s ratio. For elastic impacts, the results from Hertz theory are accurate within 20 % with the finite element simulations. The plasticity is modeled using the Deshpande-Fleck metal foam yield criterion. This yield criterion allows for plastic compressibility and can also accommodate materials having a negative Poisson’s ratio. The elasto-plastic simulations reveal that the coefficient of restitution decreases as the impact velocity is increased. The coefficient of restitution is also least for materials having a zero plastic Poisson’s ratio. Our study suggests for maximum energy dissipation the plastic Poisson’s ratio should be close to zero.

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IITH Creators:
IITH CreatorsORCiD
Khaderi, Syed NizamuddinUNSPECIFIED
Item Type: Article
Subjects: Physics > Mechanical and aerospace
Divisions: Department of Mechanical & Aerospace Engineering
Depositing User: Team Library
Date Deposited: 09 Dec 2019 04:22
Last Modified: 09 Dec 2019 04:22
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