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The propagation of longitudinal plastic waves, produced by the rotary disc impact testing machine, is observed by plastic strain gages attached to the aluminum and copper ribbons. And the influence of pre-strain on the propagation is studied. The main results obtained are as follows.1) The experimental velocity of longitudinal plastic wave propagation in aluminum and copper ribbons not pre-strained exactly coincides with the velocity calculated from the Karman's theory. But in pre-strain ribbons the experimental velocity is larger than the calculation velocity.2) The elastic front is not observed in the materials not pre-strained, but is observed in the materials pre-strained. The plastic front is not observed in any material.3) The plastic strain wave attenuates through the propagation. With the increase of pre-strain, the attenuation increases.

Propagation of Longitudinal Plastic Waves Produced by Tensile Impact