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An image-cased impact test for the high strain rate tensile properties of brittle materials

An image-cased impact test for the high strain rate tensile properties of brittle materials
An image-cased impact test for the high strain rate tensile properties of brittle materials

Testing ceramics at high strain rates presents many experimental diffsiculties due to the brittle nature of the material being tested. When using a split Hopkinson pressure bar (SHPB) for high strain rate testing, adequate time is required for stress wave effects to dampen out. For brittle materials, with small strains to failure, it is difficult to satisfy this constraint. Because of this limitation, there are minimal data (if any) available on the stiffness and tensile strength of ceramics at high strain rates. Recently, a new image-based inertial impact (IBII) test method has shown promise for analysing the high strain rate behaviour of brittle materials. This test method uses a reflected compressive stress wave to generate tensile stress and failure in an impacted specimen. Throughout the propagation of the stress wave, full-field displacement measurements are taken, from which strain and acceleration fields are derived. The acceleration fields are then used to reconstruct stress information and identify the material properties. The aim of this study is to apply the IBII test methodology to analyse the stiffness and strength of ceramics at high strain rates. The results show that it is possible to identify the elastic modulus and tensile strength of tungsten carbide at strain rates on the order of 1000 s-1. For a tungsten carbide with 13% cobalt binder the elastic modulus was identified as 516 GPa and the strength was 1400 MPa. Future applications concern boron carbide and sapphire, for which limited data exist in high rate tension.

EDP Sciences
Fletcher, Lloyd
48dca64b-f93c-4655-9205-eaf4e74be90c
Pierron, Fabrice
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Fletcher, Lloyd
48dca64b-f93c-4655-9205-eaf4e74be90c
Pierron, Fabrice
a1fb4a70-6f34-4625-bc23-fcb6996b79b4

Fletcher, Lloyd and Pierron, Fabrice (2018) An image-cased impact test for the high strain rate tensile properties of brittle materials. In DYMAT 2018 - 12th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading. vol. 183, EDP Sciences.. (doi:10.1051/epjconf/201818302042).

Record type: Conference or Workshop Item (Paper)

Abstract

Testing ceramics at high strain rates presents many experimental diffsiculties due to the brittle nature of the material being tested. When using a split Hopkinson pressure bar (SHPB) for high strain rate testing, adequate time is required for stress wave effects to dampen out. For brittle materials, with small strains to failure, it is difficult to satisfy this constraint. Because of this limitation, there are minimal data (if any) available on the stiffness and tensile strength of ceramics at high strain rates. Recently, a new image-based inertial impact (IBII) test method has shown promise for analysing the high strain rate behaviour of brittle materials. This test method uses a reflected compressive stress wave to generate tensile stress and failure in an impacted specimen. Throughout the propagation of the stress wave, full-field displacement measurements are taken, from which strain and acceleration fields are derived. The acceleration fields are then used to reconstruct stress information and identify the material properties. The aim of this study is to apply the IBII test methodology to analyse the stiffness and strength of ceramics at high strain rates. The results show that it is possible to identify the elastic modulus and tensile strength of tungsten carbide at strain rates on the order of 1000 s-1. For a tungsten carbide with 13% cobalt binder the elastic modulus was identified as 516 GPa and the strength was 1400 MPa. Future applications concern boron carbide and sapphire, for which limited data exist in high rate tension.

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More information

e-pub ahead of print date: 7 September 2018
Venue - Dates: 12th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading, DYMAT 2018, Arcachon, France, 2018-09-09 - 2018-09-14

Identifiers

Local EPrints ID: 423809
URI: http://eprints.soton.ac.uk/id/eprint/423809
PURE UUID: 12b32f2f-59d1-4d2a-a933-1e67bb950699
ORCID for Fabrice Pierron: ORCID iD orcid.org/0000-0003-2813-4994

Catalogue record

Date deposited: 02 Oct 2018 16:30
Last modified: 20 Jul 2019 00:47

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