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The Image-Based Inertial Release (IBIR) test: a new high strain rate test for stiffness strain-rate sensitivity identification

The Image-Based Inertial Release (IBIR) test: a new high strain rate test for stiffness strain-rate sensitivity identification
The Image-Based Inertial Release (IBIR) test: a new high strain rate test for stiffness strain-rate sensitivity identification
A key limitation of current moderate and high strain rate test methods is the need for external force measurement. For high loading rate hydraulic machines, ringing in the load cell corrupts the force measurement. Similarly, the analysis of split-Hopkinson bar tests requires the assumption that the specimen is in a state of quasi-static equilibrium. Recently, image-based inertial test methods have shown that external force measurement is not required if full-field measurements are available and inertial effects are significant enough. In this case the load information is provided by the acceleration fields which are derived from full-field displacement measurements. This article describes a new image- based inertial test method that can be used for simultaneous quasi-static and high strain rate stiffness identification on the same test sample. An experimental validation of the new test method is provided using PMMA samples. A major advantage of this new test method is that it utilises a standard tensile test machine and the only specialist equipment that is required is an ultra-high speed camera.
full-field measurements, grid method, high strain rate, polymers, virtual fields method
1741-2765
493-508
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 (2020) The Image-Based Inertial Release (IBIR) test: a new high strain rate test for stiffness strain-rate sensitivity identification. Experimental Mechanics, 60 (4), 493-508. (doi:10.1007/s11340-019-00580-6).

Record type: Article

Abstract

A key limitation of current moderate and high strain rate test methods is the need for external force measurement. For high loading rate hydraulic machines, ringing in the load cell corrupts the force measurement. Similarly, the analysis of split-Hopkinson bar tests requires the assumption that the specimen is in a state of quasi-static equilibrium. Recently, image-based inertial test methods have shown that external force measurement is not required if full-field measurements are available and inertial effects are significant enough. In this case the load information is provided by the acceleration fields which are derived from full-field displacement measurements. This article describes a new image- based inertial test method that can be used for simultaneous quasi-static and high strain rate stiffness identification on the same test sample. An experimental validation of the new test method is provided using PMMA samples. A major advantage of this new test method is that it utilises a standard tensile test machine and the only specialist equipment that is required is an ultra-high speed camera.

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FletcherPierron2019_IBIRTest_Final - Accepted Manuscript
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The Image-Based Inertial Release (IBIR) Test - Version of Record
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More information

Accepted/In Press date: 30 December 2019
e-pub ahead of print date: 23 January 2020
Keywords: full-field measurements, grid method, high strain rate, polymers, virtual fields method

Identifiers

Local EPrints ID: 441845
URI: http://eprints.soton.ac.uk/id/eprint/441845
ISSN: 1741-2765
PURE UUID: 88f879dd-749d-4bb3-bd4e-a2f7ee458ab4
ORCID for Fabrice Pierron: ORCID iD orcid.org/0000-0003-2813-4994

Catalogue record

Date deposited: 30 Jun 2020 16:30
Last modified: 22 Nov 2021 02:58

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