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A system for measuring biaxial creep strains over short gage lengths

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Abstract

This paper presents a new system for measuring biaxial strains over gage lengths of 150 micrometers at temperatures up to 300°C under constant loading for times as long as 1300 hours. This system has been used to measure axial and lateral strains at notch roots with a radius of 1 millimeter in zirconium specimens. A complete description of the techniques and procedures as well as an overview of the results is given in this paper.

The principle of the measurement is the interference of laser light reflected from three tiny indentations placed in an orthogonal pattern at the notch root. The indentations, which are applied with a Vickers microhardness tester, produce four fringe patterns; two are used for strain measurement in the axial direction and two for the lateral direction. The motions of these four fringe patterns are monitored with linear diode arrays and converted via a microcomputer system into the two measured strains. The system operates on a real-time basis so it is possible to record the strains as the notched specimen is loaded and then held at constant load.

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Authors and Affiliations

  1. Department of Mechanical Engineering, The Johns Hopkins University, 21218, Baltimore, MD

    H. Zeng (Graduate Student) & W. N. Sharpe Jr. (Professor)

Authors
  1. H. Zeng
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  2. W. N. Sharpe Jr.
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Zeng, H., Sharpe, W.N. A system for measuring biaxial creep strains over short gage lengths. Experimental Mechanics 36, 84–91 (1996). https://doi.org/10.1007/BF02328702

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  • DOI: https://doi.org/10.1007/BF02328702

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