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Application of digital image correlation to address complex motions in thermoelastic stress analysis

Application of digital image correlation to address complex motions in thermoelastic stress analysis
Application of digital image correlation to address complex motions in thermoelastic stress analysis
A motion compensation method for thermoelastic stress analysis (TSA) is described that uses digital image correlation (DIC) to capture the displacement field on the surface of the specimen. The displacement field is used to correct the infrared (IR) images to remove the effect of the motion of the specimen from the TSA. As the DIC displacements are obtained with a relatively high spatial resolution, sharp displacement gradients and discontinuities can be corrected. The feasibility of the motion compensation method for TSA is investigated firstly by validating the approach using data obtained from an aluminium alloy plate with a central circular hole loaded in tension and comparing the results with a finite element model. It is shown that the motion compensation approach significantly improves the accuracy of TSA, particularly when high magnification optics are used. Next, the feasibility of simultaneous capture of IR and white light images is investigated. It is shown that by using the correct combination of paints, a speckle pattern can be applied to the surface to provide contrast in the white light spectrum for the DIC, but have a uniform emissivity in the IR spectrum so that there is no effect on the TSA. Thus it is possible for the motion compensation to be conducted on data collected during fatigue tests. Finally, it is demonstrated that the motion compensation technique can be applied to discontinuous motion produced by face sheet debonding in a foam cored sandwich structure loaded in a double cantilever beam (DCB) configuration. It is shown that the motion compensation technique is capable of correcting the complex and non-uniform motion for TSA in the DCB test, thereby enabling detailed thermoelastic data to be obtained from the vicinity of the crack tip.
digital image correlation (DIC), motion compensation, thermoelastic stress analysis (TSA)
1475-1305
405-418
Wang, W.
55ec185d-4220-4213-99ee-0819d50233f6
Fruehmann, R.K.
0f4fc30f-4e3d-4b34-9001-c93ec23767d7
Dulieu-Barton, J.M.
9e35bebb-2185-4d16-a1bc-bb8f20e06632
Wang, W.
55ec185d-4220-4213-99ee-0819d50233f6
Fruehmann, R.K.
0f4fc30f-4e3d-4b34-9001-c93ec23767d7
Dulieu-Barton, J.M.
9e35bebb-2185-4d16-a1bc-bb8f20e06632

Wang, W., Fruehmann, R.K. and Dulieu-Barton, J.M. (2015) Application of digital image correlation to address complex motions in thermoelastic stress analysis. Strain, 51 (5), 405-418. (doi:10.1111/str.12151).

Record type: Article

Abstract

A motion compensation method for thermoelastic stress analysis (TSA) is described that uses digital image correlation (DIC) to capture the displacement field on the surface of the specimen. The displacement field is used to correct the infrared (IR) images to remove the effect of the motion of the specimen from the TSA. As the DIC displacements are obtained with a relatively high spatial resolution, sharp displacement gradients and discontinuities can be corrected. The feasibility of the motion compensation method for TSA is investigated firstly by validating the approach using data obtained from an aluminium alloy plate with a central circular hole loaded in tension and comparing the results with a finite element model. It is shown that the motion compensation approach significantly improves the accuracy of TSA, particularly when high magnification optics are used. Next, the feasibility of simultaneous capture of IR and white light images is investigated. It is shown that by using the correct combination of paints, a speckle pattern can be applied to the surface to provide contrast in the white light spectrum for the DIC, but have a uniform emissivity in the IR spectrum so that there is no effect on the TSA. Thus it is possible for the motion compensation to be conducted on data collected during fatigue tests. Finally, it is demonstrated that the motion compensation technique can be applied to discontinuous motion produced by face sheet debonding in a foam cored sandwich structure loaded in a double cantilever beam (DCB) configuration. It is shown that the motion compensation technique is capable of correcting the complex and non-uniform motion for TSA in the DCB test, thereby enabling detailed thermoelastic data to be obtained from the vicinity of the crack tip.

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Wang et al Strain 2015.pdf - Accepted Manuscript
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More information

e-pub ahead of print date: 26 August 2015
Published date: October 2015
Keywords: digital image correlation (DIC), motion compensation, thermoelastic stress analysis (TSA)
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 382002
URI: http://eprints.soton.ac.uk/id/eprint/382002
ISSN: 1475-1305
PURE UUID: 93f43d1a-9dec-47d1-a8f9-66356d5df75c

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Date deposited: 28 Sep 2015 14:22
Last modified: 14 Mar 2024 21:24

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Contributors

Author: W. Wang
Author: R.K. Fruehmann

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