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The effects of contact conditions on impact tests on plastics

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Abstract

The causes of the force oscillations observed in instrumented impact tests were investigated. Vibrational modes are excited in cantilever-beam specimens by the initial contact between the striker and the specimen. Although a one-dimensional mass and spring model can predict the oscillations qualitatively, the predicted forces are too large by a factor of two for slender cantilever beams, but approximately correct for lower aspect ratio beams. Computer models can predict the whole of the force deflection curve, but no one-dimensional model can realistically model all the details of the vibrations of a beam specimen. One effective way of reducing the oscillations was to introduce a high hysteresis rubber between the striker and specimen. This was found to produce more meaningful force-deflection or stress-strain curves for polystyrene, without changing the values of the failure stress.

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Authors and Affiliations

  1. Department of Metallurgy and Materials, University of Birmingham, PO Box 363, B15 2TT, Birmingham, UK

    N. J. Mills

  2. The Research Institute for Strength of Metals, Xían Jiatong University, Xían, China

    P. S. Zhang

Authors
  1. N. J. Mills
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  2. P. S. Zhang
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Mills, N.J., Zhang, P.S. The effects of contact conditions on impact tests on plastics. J Mater Sci 24, 2099–2109 (1989). https://doi.org/10.1007/BF02385427

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  • DOI: https://doi.org/10.1007/BF02385427

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