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Partial volume correction for approximating crack opening displacements in CFRP material obtained from micro-focus X-ray CT scans

Partial volume correction for approximating crack opening displacements in CFRP material obtained from micro-focus X-ray CT scans
Partial volume correction for approximating crack opening displacements in CFRP material obtained from micro-focus X-ray CT scans
This paper presents a partial volume correction technique that applies a measurement weighting based on grey scale intensity values, allowing crack opening displacements (CODs) to be better estimated in micro-focus computed tomography (?CT) scans. These were tested on 3D data obtained from two separate ?CT scanners on particle toughened and non-particle toughened carbon fibre material subjected to low velocity impact. Direct comparisons of COD estimations were made with higher resolution measurements obtained using synchrotron radiation computed tomography (SRCT) scans taken at the European Synchrotron Radiation Facility (ESRF). In this study, partial volume correction is reported to improve the accuracy of these measurements to within 20% of SRCT measurements, whereas measurements based on counting interconnected voxels representing a detectable crack are reported to consistently overestimate crack openings by up to 500%. Scatter in estimations was dependent on material type, noise, and artefacts associated with ?CT volumes.
carbon fibre, impact behaviour, crack, non-destructive testing, x-ray computed tomography
0266-3538
9-16
Bull, D.J.
3569ba02-89de-4398-a14d-02c3f9b4eab2
Sinclair, I.
6005f6c1-f478-434e-a52d-d310c18ade0d
Spearing, S.M.
9e56a7b3-e0e8-47b1-a6b4-db676ed3c17a
Bull, D.J.
3569ba02-89de-4398-a14d-02c3f9b4eab2
Sinclair, I.
6005f6c1-f478-434e-a52d-d310c18ade0d
Spearing, S.M.
9e56a7b3-e0e8-47b1-a6b4-db676ed3c17a

Bull, D.J., Sinclair, I. and Spearing, S.M. (2013) Partial volume correction for approximating crack opening displacements in CFRP material obtained from micro-focus X-ray CT scans. Composites Science and Technology, 81, 9-16. (doi:10.1016/j.compscitech.2013.03.017).

Record type: Article

Abstract

This paper presents a partial volume correction technique that applies a measurement weighting based on grey scale intensity values, allowing crack opening displacements (CODs) to be better estimated in micro-focus computed tomography (?CT) scans. These were tested on 3D data obtained from two separate ?CT scanners on particle toughened and non-particle toughened carbon fibre material subjected to low velocity impact. Direct comparisons of COD estimations were made with higher resolution measurements obtained using synchrotron radiation computed tomography (SRCT) scans taken at the European Synchrotron Radiation Facility (ESRF). In this study, partial volume correction is reported to improve the accuracy of these measurements to within 20% of SRCT measurements, whereas measurements based on counting interconnected voxels representing a detectable crack are reported to consistently overestimate crack openings by up to 500%. Scatter in estimations was dependent on material type, noise, and artefacts associated with ?CT volumes.

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Partial volume correction for approximating crack opening displacements in CFRP material obtained from micro-focus X-ray CT scans.pdf - Accepted Manuscript
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More information

e-pub ahead of print date: 3 April 2013
Published date: 14 June 2013
Keywords: carbon fibre, impact behaviour, crack, non-destructive testing, x-ray computed tomography
Organisations: Engineering Science Unit

Identifiers

Local EPrints ID: 355773
URI: https://eprints.soton.ac.uk/id/eprint/355773
ISSN: 0266-3538
PURE UUID: d5e5c455-5cb2-4094-abd9-c629e1165962
ORCID for D.J. Bull: ORCID iD orcid.org/0000-0001-6711-6153
ORCID for S.M. Spearing: ORCID iD orcid.org/0000-0002-3059-2014

Catalogue record

Date deposited: 04 Sep 2013 13:25
Last modified: 17 May 2019 00:35

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