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On the direct measurement of very large strain at high strain rates

Paper describes how the diffraction-grating technique may be modified to measure large dynamic plastic strain for very large strain at high strain rates in the presence of changing light intensity

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Abstract

When dynamic plastic strain exceeds 4-percent deformation in completely annealed polycrystalline aluminum, difficulties in the optical measurment of strain occur because of changes in the diffuse-ambient-background light arising from the growth of a mottled surface, or “organe peel.”

This paper describes how the diffraction-grating technique may be modified to measure dynamic plastic strain for very large strain at high strain rates in the presence of changing light intensity.

The experimental results obtained show that the strain-rate-independent finite-amplitude wave theory, governed by the present writer's generalized, linearly temperature-dependent parabolic stress-strain law, still applies.

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Authors and Affiliations

  1. The Johns Hopkins University, Baltimore, Md.

    James F. Bell (Professor of Solid Mechanics)

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  1. James F. Bell
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Bell, J.F. On the direct measurement of very large strain at high strain rates. Experimental Mechanics 7, 8–14 (1967). https://doi.org/10.1007/BF02326834

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  • DOI: https://doi.org/10.1007/BF02326834

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