Characterisation of dynamic behaviour of alumina ceramics: evaluation of stress uniformity | Zendy

Zhiyong Wang | Zendy; Peifeng Li | Zendy

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Characterisation of dynamic behaviour of alumina ceramics: evaluation of stress uniformity

Author(s) -

Zhiyong Wang,

Peifeng Li

Publication year - 2015

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4934793

Subject(s) - materials science , split hopkinson pressure bar , ceramic , deformation (meteorology) , composite material , finite element method , homogeneous , alumina ceramic , stress (linguistics) , bar (unit) , structural engineering , strain rate , geology , linguistics , philosophy , physics , oceanography , engineering , thermodynamics

Accurate characterisation of dynamic behaviour of ceramics requires the reliable split-Hopkinson pressure bar (SHPB) technique and the condition of uniaxial homogeneous specimen deformation. In this study, an experimentally validated 3D finite element model of the full scale SHPB experiment was developed to quantitatively evaluate the wave propagation in the bars and the stress distribution/evolution in the alumina specimen. Wave signals in both the SHPB experiments and the finite element model were analysed to characterise the dynamic behaviour of alumina. It was found that the equilibrium of both stresses within the specimen and forces at the specimen ends can be established in the intermediate stage of deformation. The validity of stress uniformity in the alumina specimen supports the assumption of uniaxial homogeneous specimen deformation in the SHPB and validates the characterisation of dynamic behaviour of alumina ceramics

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