An Image-Based Inertial Impact (IBII) test for tungsten carbide cermets
An Image-Based Inertial Impact (IBII) test for tungsten carbide cermets
Testing tungsten carbide cermets at high strain rates is difficult due to their high stiffness and brittle failure mode. Therefore, the aim of this study is to apply the image-based inertial impact (IBII) test methodology to analyse the high strain rate properties of tungsten carbide cermets. The IBII test uses an edge on impact test configuration with a narrow stress pulse. The narrow input pulse travels through the specimen in compression and reflects in tension causing failure. Full-field measurements of acceleration and strain are then coupled with the virtual fields method to identify the stiffness components and tensile strength of a test sample at high strain rates. Image deformation simulations were used to select optimal test processing parameters and predict the associated experimental errors. The elastic modulus and tensile strength of the tested tungsten carbide cermet samples were successfully identified using the IBII test at strain rates on the order of 1000/s. No significant strain rate dependence was detected for either the stiffness or tensile strength.
Fletcher, Lloyd
48dca64b-f93c-4655-9205-eaf4e74be90c
Pierron, Fabrice
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
2018
Fletcher, Lloyd
48dca64b-f93c-4655-9205-eaf4e74be90c
Pierron, Fabrice
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Fletcher, Lloyd and Pierron, Fabrice
(2018)
An Image-Based Inertial Impact (IBII) test for tungsten carbide cermets.
Journal of Dynamic Behavior of Materials.
(doi:10.1007/s40870-018-0172-4).
Abstract
Testing tungsten carbide cermets at high strain rates is difficult due to their high stiffness and brittle failure mode. Therefore, the aim of this study is to apply the image-based inertial impact (IBII) test methodology to analyse the high strain rate properties of tungsten carbide cermets. The IBII test uses an edge on impact test configuration with a narrow stress pulse. The narrow input pulse travels through the specimen in compression and reflects in tension causing failure. Full-field measurements of acceleration and strain are then coupled with the virtual fields method to identify the stiffness components and tensile strength of a test sample at high strain rates. Image deformation simulations were used to select optimal test processing parameters and predict the associated experimental errors. The elastic modulus and tensile strength of the tested tungsten carbide cermet samples were successfully identified using the IBII test at strain rates on the order of 1000/s. No significant strain rate dependence was detected for either the stiffness or tensile strength.
Text
Fletcher-Pierron2018_Article_AnImage-BasedInertialImpactIBI
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Accepted/In Press date: 10 August 2018
e-pub ahead of print date: 24 August 2018
Published date: 2018
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Local EPrints ID: 424554
URI: http://eprints.soton.ac.uk/id/eprint/424554
ISSN: 2199-7446
PURE UUID: 6597be0d-78a8-450f-8b32-8914ce95fd99
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Date deposited: 05 Oct 2018 11:38
Last modified: 16 Mar 2024 04:02
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