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Investigation of the 2D assumption in the image-based inertial impact test

Investigation of the 2D assumption in the image-based inertial impact test
Investigation of the 2D assumption in the image-based inertial impact test

The image-based inertial impact (IBII) test has shown promise for measuring properties of composites at strain rates where existing test methods become unreliable due to inertial effects (> 10 2 s −1). Typically, the IBII tests are performed with a single camera, and therefore, to use surface measurements for material property identification, it is necessary to assume that the test is two-dimensional. In this work, synchronised ultra-high-speed cameras are used to quantify the relevance of this assumption when nonuniform, through-the-thickness loading is applied to interlaminar samples. Initial experiments revealed that an angular misalignment of approximately 1° between the impact faces of the waveguide and projectile created a bending wave that propagated along the sample behind the axial pulse. Even under these conditions, consistent measurements of stiffness were made by assuming a linear distribution of the behaviour through-the-thickness. When the misalignment was reduced to 0.2°, the effects on single-sided measurements were significantly reduced. The two alignment cases were compared to show that three-dimensional loading had a small effect on stiffness identification (approximately 5% bias) relative to failure stress (approximately 30% bias). This study highlights the importance of impact alignment for reliable characterisation of the interlaminar failure stress and was used to establish guidelines for diagnosing loading issues from single-sided measurements.

fibre-reinforced polymer composites, high strain rate, image-based inertial impact (IBII) test, interlaminar properties, ultra-high-speed imaging
1475-1305
Van Blitterswyk, Jared
d113eca6-6ee0-4f0e-a983-b5636fadbd71
Fletcher, Lloyd
48dca64b-f93c-4655-9205-eaf4e74be90c
Pierron, Fabrice
a1fb4a70-6f34-4625-bc23-fcb6996b79b4
Van Blitterswyk, Jared
d113eca6-6ee0-4f0e-a983-b5636fadbd71
Fletcher, Lloyd
48dca64b-f93c-4655-9205-eaf4e74be90c
Pierron, Fabrice
a1fb4a70-6f34-4625-bc23-fcb6996b79b4

Van Blitterswyk, Jared, Fletcher, Lloyd and Pierron, Fabrice (2021) Investigation of the 2D assumption in the image-based inertial impact test. Strain, 57 (1), [e12369]. (doi:10.1111/str.12369).

Record type: Article

Abstract

The image-based inertial impact (IBII) test has shown promise for measuring properties of composites at strain rates where existing test methods become unreliable due to inertial effects (> 10 2 s −1). Typically, the IBII tests are performed with a single camera, and therefore, to use surface measurements for material property identification, it is necessary to assume that the test is two-dimensional. In this work, synchronised ultra-high-speed cameras are used to quantify the relevance of this assumption when nonuniform, through-the-thickness loading is applied to interlaminar samples. Initial experiments revealed that an angular misalignment of approximately 1° between the impact faces of the waveguide and projectile created a bending wave that propagated along the sample behind the axial pulse. Even under these conditions, consistent measurements of stiffness were made by assuming a linear distribution of the behaviour through-the-thickness. When the misalignment was reduced to 0.2°, the effects on single-sided measurements were significantly reduced. The two alignment cases were compared to show that three-dimensional loading had a small effect on stiffness identification (approximately 5% bias) relative to failure stress (approximately 30% bias). This study highlights the importance of impact alignment for reliable characterisation of the interlaminar failure stress and was used to establish guidelines for diagnosing loading issues from single-sided measurements.

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strain_1558_final_manuscript - Accepted Manuscript
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More information

Accepted/In Press date: 31 August 2020
e-pub ahead of print date: 6 October 2020
Published date: February 2021
Keywords: fibre-reinforced polymer composites, high strain rate, image-based inertial impact (IBII) test, interlaminar properties, ultra-high-speed imaging

Identifiers

Local EPrints ID: 443795
URI: http://eprints.soton.ac.uk/id/eprint/443795
ISSN: 1475-1305
PURE UUID: b774fcad-574b-4129-ab11-048b65a00202
ORCID for Fabrice Pierron: ORCID iD orcid.org/0000-0003-2813-4994

Catalogue record

Date deposited: 11 Sep 2020 16:41
Last modified: 31 Aug 2021 04:01

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Contributors

Author: Jared Van Blitterswyk
Author: Lloyd Fletcher
Author: Fabrice Pierron ORCID iD

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