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Deformation and Rigid-body-motion Measurement by Multiple Interferometric Strain/Slope Rosettes

Part II: Fringe Analysis

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Abstract

In Part I, the Multi-ISSR measurement theory was given and validated for a three-indentation ISSR. Part II shows how fringe analysis is carried out by applying the theory to real measurement problems. Two-dimensional image processing techniques are applied to both the ISSR and the Multi-ISSR. The procedures are demonstrated through a bending experiment where a four-indentation Multi-ISSR is used. A practical example is given to demonstrate the numerical procedure involved in extracting the diffraction pattern, and calculating the shift of the zero-order diffraction peak to measure rigid-body-motion. Fringe pattern analysis includes numerical fringe separation and phase shift determination. Three practical approaches of obtaining strains by solving the governing equations relating phase shifts with strains and rigid-body-motion are discussed.

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Acknowledgement

This research was financially sponsored by NSF grant CMS-9734533.

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Authors and Affiliations

  1. Oakland University, Rochester Hills, MI, 48309, USA

    T. Tjhung (SEM Member) & K. Li (SEM Member)

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  1. T. Tjhung
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  2. K. Li
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Correspondence to K. Li.

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Tjhung, T., Li, K. Deformation and Rigid-body-motion Measurement by Multiple Interferometric Strain/Slope Rosettes. Exp Mech 49, 341–352 (2009). https://doi.org/10.1007/s11340-008-9170-0

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  • DOI: https://doi.org/10.1007/s11340-008-9170-0

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