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New technique to investigate necking in a tensile hopkinson bar

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Abstract

A photographic system using a light-emitting diode (LED) illuminator and a 35-mm rotating drum camera has been developed for the diagnosis of dynamic-tensile tests conducted with a split Hopkinson tension bar. Back-lit photographs of deforming tensile samples are obtained at rates up to 50 kHz. The LED exposures are precisely time correlated with the conventional bar-strain-gage records. The system can be used to extend the measurement of stress-strain curves beyond the onset of plastic instability (necking).

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References

  1. Nicholas, T., “Tensile Testing of Materials at High Rates of Strain”,Experimental Mechanics,21,177–185 (1980).

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  2. Bridgeman, P.W., Studies in Large Plastic Flow and Fracture, Chapt. 1, McGraw-Hill, New York (1952).

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  3. Hutchings, I.M. and Andrews, D.R., “Light Emitting Diodes as Short Duration Light Sources” Proc. 13th Int. Cong. High Speed Photography, Tokyo, 222–225 (1978).

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Authors and Affiliations

  1. University of Dayton Research Institute, 45469, Dayton, OH

    L. A. Cross (Research Physicist), S. J. Bless (Impact Physics Group Leader), A. M. Rajendran (Research Engineer), E. A. Strader (Technologist) & D. S. Dawicke (Associate Research Engineer)

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  1. L. A. Cross
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  2. S. J. Bless
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  3. A. M. Rajendran
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  4. E. A. Strader
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  5. D. S. Dawicke
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Cross, L.A., Bless, S.J., Rajendran, A.M. et al. New technique to investigate necking in a tensile hopkinson bar. Experimental Mechanics 24, 184–186 (1984). https://doi.org/10.1007/BF02323163

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  • DOI: https://doi.org/10.1007/BF02323163

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