Plastic Impacts on Short Cylindrical Specimens

    Published: Jan 1963

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    It is suggested that the relationship between stress, strain, and strain rate at strain rates corresponding to those encountered in wave propagation cannot be determined by any direct measurement of material properties. These properties can best be determined by theoretical and experimental studies of plastic wave propagation. As an example of this approach, measurements of stresses and strains generated in short cylindrical copper specimens by the impact of a relatively rigid projectile are compared with computed results. Computations were made for both a nonstrain-rate-sensitive stress-strain relationship and a stress-strain relationship dependent on instantaneous plastic strain and strain rate. The comparisons indicate that neither of these assumed material property relationships adequately represents the copper used in the investigation. However, the strain-rate type of representation may conceivably be modified so as to provide an adequate material property law.

    Author Information:

    Rippkrger, E. A.
    Professor and Instructor, The University of Texas, Austin, Tex

    Karnes, C. H.
    Professor and Instructor, The University of Texas, Austin, Tex

    Committee/Subcommittee: D20.10

    DOI: 10.1520/STP42029S

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