Image Correlation Applied to Single Crystal Plasticity Experiments and Comparison to Strain Gage Data

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Full-field optical techniques are becoming increasingly popular for measuring the deformation of materials, especially in materials that exhibit non-uniform behavior. While there are many full-field techniques available (e.g. moire interferometry, electronic speckle pattern interferometry (ESPI), holography, and image correlation [1]), for our study of the deformation of single crystals, the image correlation technique was chosen for its insensitivity to vibrations and ability to measure large strains. While the theory and development of the algorithms for image correlation have been presented elsewhere [2,3] a comparative study to a conventional strain measurement device, such as a strain gage rosette, is desired to ... continued below

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LeBlanc, M M; Florando, J N; Lassila, D H; Schmidt, T & Tyson II, J June 29, 2005.

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Full-field optical techniques are becoming increasingly popular for measuring the deformation of materials, especially in materials that exhibit non-uniform behavior. While there are many full-field techniques available (e.g. moire interferometry, electronic speckle pattern interferometry (ESPI), holography, and image correlation [1]), for our study of the deformation of single crystals, the image correlation technique was chosen for its insensitivity to vibrations and ability to measure large strains. While the theory and development of the algorithms for image correlation have been presented elsewhere [2,3] a comparative study to a conventional strain measurement device, such as a strain gage rosette, is desired to test the robustness and accuracy of the technique. The 6 Degrees of Freedom (6DOF) experiment, which was specifically designed to validate dislocation dynamics (DD) simulations [4], is ideally suited to compare the two methods. This experiment is different from previous experiments on single crystals in that it allows the crystal to deform essentially unconstrained, in both the elastic and plastic regimes, by allowing the bottom of the sample to move as the sample is being compressed. This unconstrained motion prevents the internal crystal planes from rotating during the deformation as typically seen in the pioneering work of Schmid [5] and Taylor [6]. In the early development of the 6DOF apparatus, stacked strain gage rosettes were used to provide the strain data [7]. While very accurate at small strains, strain gages provide an averaged measurement over a small area and cannot be used to measure the inhomogeneous plastic strains that typically occur during the 6DOF experiment. An image correlation technique can measure the full-field in-plane and out-of-plane deformation that occurs in single crystals, and a comparison to the strain gage data at small strains can test the accuracy of the method.

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PDF-file: 12 pages; size: 1 Mbytes

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  • Journal Name: Experimental Techniques, vol. 30, no. 4, July 31, 2006, pp. 33-37

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  • Report No.: UCRL-JRNL-213561
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 891719
  • Archival Resource Key: ark:/67531/metadc883014

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  • June 29, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 29, 2016, 2:13 p.m.

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LeBlanc, M M; Florando, J N; Lassila, D H; Schmidt, T & Tyson II, J. Image Correlation Applied to Single Crystal Plasticity Experiments and Comparison to Strain Gage Data, article, June 29, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc883014/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.