Generalized stress-strain curves for IBII tests on isotropic and orthotropic materials
Generalized stress-strain curves for IBII tests on isotropic and orthotropic materials
This article presents a particular use of the Virtual Fields Method to exploit the results of Image-Based Inertial Impact (IBII) tests. This test consists on an edge-on impact of a free-standing thin flat rectangular coupon. The specimen response is recorded using an ultra-high speed camera filming the deformation of a grid pattern printed at its surface. From these images, displacement fields are derived, from which strain and acceleration can be obtained. The Virtual Fields Method makes use of the acceleration fields to derive stress information. Until now, a very simple 'stress-gauge' approach was used that could only provide relevant stress-strain information if the test was predominantly uniaxial. The alternative was to use the full inverse approach with the Virtual Fields Method but this would not allow the same degree of data understanding as the 'stress-gauge' approach. This article proposes an extension to this 'stress-gauge' approach for fully multiaxial tests. The equations are first derived and then validated using simulated and experimental IBII test data on isotropic and orthotropic materials.
High strain rate, high speed imaging, grid method, Virtual Fields Method, composites
180-193
Pierron, Fabrice
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Fletcher, Lloyd
48dca64b-f93c-4655-9205-eaf4e74be90c
June 2019
Pierron, Fabrice
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Fletcher, Lloyd
48dca64b-f93c-4655-9205-eaf4e74be90c
Pierron, Fabrice and Fletcher, Lloyd
(2019)
Generalized stress-strain curves for IBII tests on isotropic and orthotropic materials.
Journal of Dynamic Behavior of Materials, 5 (1), .
(doi:10.1007/s40870-019-00197-9).
Abstract
This article presents a particular use of the Virtual Fields Method to exploit the results of Image-Based Inertial Impact (IBII) tests. This test consists on an edge-on impact of a free-standing thin flat rectangular coupon. The specimen response is recorded using an ultra-high speed camera filming the deformation of a grid pattern printed at its surface. From these images, displacement fields are derived, from which strain and acceleration can be obtained. The Virtual Fields Method makes use of the acceleration fields to derive stress information. Until now, a very simple 'stress-gauge' approach was used that could only provide relevant stress-strain information if the test was predominantly uniaxial. The alternative was to use the full inverse approach with the Virtual Fields Method but this would not allow the same degree of data understanding as the 'stress-gauge' approach. This article proposes an extension to this 'stress-gauge' approach for fully multiaxial tests. The equations are first derived and then validated using simulated and experimental IBII test data on isotropic and orthotropic materials.
Text
Pierron-Fletcher 2019 Article Generalized Stress Strain Curves
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Accepted/In Press date: 16 April 2019
e-pub ahead of print date: 6 May 2019
Published date: June 2019
Keywords:
High strain rate, high speed imaging, grid method, Virtual Fields Method, composites
Identifiers
Local EPrints ID: 430728
URI: http://eprints.soton.ac.uk/id/eprint/430728
ISSN: 2199-7446
PURE UUID: fad2a9b2-3009-4c10-814d-91396df4007c
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Date deposited: 09 May 2019 16:30
Last modified: 16 Mar 2024 04:02
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