Abstract
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.
Highlights
Ceramic materials are increasingly used in armour applications due to their light weight and high compressive strength
An experimentally validated 3D finite element model of the full scale split-Hopkinson pressure bar (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
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
Summary
Ceramic materials are increasingly used in armour applications due to their light weight and high compressive strength. Even though the wave signals can be aligned to the bar-specimen interfaces, few studies[18,19] examined the stress equilibrium in specimens, the condition for a valid SHPB test. Models for ceramics focused on the evolution of damage during the impact process.[15,20,22] Numerical simulation provides an effective way to examine the forces at the bar-specimen interfaces and the stress distribution in the ceramics, and to verify the uniaxial homogeneous deformation of the specimen during the SHPB process. The stress uniformity within the specimen as well as the force equilibrium at the interfaces was analysed and evaluated to validate the condition of the SHPB test and allow for the accurate characterisation of dynamic behaviour of alumina
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