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On the use of Digital Image Correlation (DIC) for measurement of deformation and motion of ice

IP.com Disclosure Number: IPCOM000241773D
Publication Date: 2015-May-29
Document File: 3 page(s) / 2M

Publishing Venue

The IP.com Prior Art Database

Abstract

Digital Image Correlation (DIC) is commonly used as a non-contact method of obtaining full-field maps of strain in experimental mechanics. This technique can be used to determine full-field deformations and motions in sea ice using aerial imagery such as satellite high-resolution optical images or synthetic aperture radar (SAR) images. DIC can also be used to obtain information about the ice during model tests of structures in ice.

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On the use of Digital Image Correlation (DIC) for measurement of deformation and motion of ice

Abstract

Digital Image Correlation (DIC) is commonly used as a non-contact method of obtaining full-field maps of strain in experimental mechanics. This technique can be used to determine full-field deformations and motions in sea ice using aerial imagery such as satellite high-resolution optical images or synthetic aperture radar (SAR) images. DIC can also be used to obtain information about the ice during model tests of structures in ice.

Analysis of Field Data

Arctic ice is frequently moving and deforming as a result of environmental loads. Wind drag can lead to compressive stresses in the ice that are intermittently released when the ice fractures and breaks up, often forming ridges. Navigation and ice management operations can be strongly impacted by compression in the ice. Despite the importance of understanding and quantifying compression in the ice, there are no proven methods to measure deformation in compressed ice, especially in a large scale. Local measurements have been attempted with limited success and would only provide scattered measurements over the area of interest. Alternatively, qualitative measures of ice pressure can be obtained by ships estimating the time it takes for a channel to close behind them. This procedure is somewhat subjective and could only be occasionally used during navigation, as ships typically try to avoid pressured ice conditions.

The high resolution satellite images of ice fields naturally show enough variability in patterns that allows the use of DIC to characterize the motions and the deformations of the ice over specified regions.

Analysis of Model Test Data

Model tests employing reduced scale models of structures in ice usually provide loads acting on the structure but limited quantitative information is available about the ice surrounding the structure.

During model tests, several digital cameras usually film the structure and surrounding ice from several angles. It is possible to use these videos to compute the full field displacements and deformations in the ice during the model tests.

Digital Image Correlation (DIC)

DIC is commonly used as a non-contact method of obtaining full-field maps of strain i...