抄録
The present paper is concerned with the measurement of flow stress of poly vinyl chloride at high strain rate using the technique in which a projectile collides with an elastic bar. The dynamic yield stress of polymer was obtained using one dimensional elasto-plastic wave propagation analysis by Hutchings (1979) who employed the same technique. But one of the assumptions used in the Hutching's theory is not consistent with the experimental results in this paper. Therefore, the assumption that elastic wave velocity in the projectile is constant with impact velocity is used in this paper instead.
The results showed that the modified yield stress increased with impact velocity, though the stress from Hutchings's theory was roughly constant. The modified yield stress agreed with the stress obtained from strain gages qualitatively and coincided also with the experimental data of other papers.
