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Grid Method for Microscale Discontinuous Deformation Measurement

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Abstract

The objective of this paper is to explore both grid method and Digital Image Correlation (DIC) technique for microscale and discontinuous displacement measurements, such as those associated with crack tips. First, the principle of the grid method is revisited. The grid method and DIC technique are then applied to computer generated images to calculate the displacement field around crack tips. Finally, the grid method is applied to actual experimental images of fracture tests which are conducted inside a Scanning Electron Microscope (SEM) chamber. A new technique is developed to generate microscale pattern that is suitable for both grid method and DIC technique. The displacement fields calculated from grid method are compared with those from DIC technique to identify the strengths and weaknesses of each technique for the microscale and discontinuous displacement measurements. It has been determined that grid method can obtain data closer to the discontinuity than DIC; however, DIC produces smoother displacement fields at the far field. Using this new pattern generation technique, both grid method and DIC technique can be applied to the fracture test at the microscale to complement with each other to achieve the best experiment results.

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Acknowledgement

Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy under contract DE-AC04-94-AL85000. Support provided by NSF under grant number DMR-0907122 is also greatly appreciated.

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Authors and Affiliations

  1. Mechanics of Materials, Sandia National Laboratories California, Livermore, CA, USA

    H. Jin (SEM member) & W.-Y. Lu (SEM member)

  2. Department of Mechanical Engineering, University of Maryland, College Park, MD, USA

    S. Haldar & H. A. Bruck (SEM member)

Authors
  1. H. Jin
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  2. S. Haldar
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  3. H. A. Bruck
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  4. W.-Y. Lu
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Correspondence to H. Jin.

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Jin, H., Haldar, S., Bruck, H.A. et al. Grid Method for Microscale Discontinuous Deformation Measurement. Exp Mech 51, 565–574 (2011). https://doi.org/10.1007/s11340-010-9459-7

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  • DOI: https://doi.org/10.1007/s11340-010-9459-7

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