抄録
Split Hopkinson Pressure Bar (SHPB) is known as a simple method to investigate the deformation of materials at high strain rate. To heat the specimen upto the melting point of the material of elastic bars, the specimen must have a finite length. In such case, the result is inaccurate because of the assumption of existing evaluation method that the specimen has infinitely short length. This paper introduces a new evaluation method utilizing Fourier analysis which enables accurate investigation of viscoelastisity of materials considering the stress and the temperature distribution in a long specimen. By the use of this method, The attenuation of silicon nitride, at high temperature from 900°C to 1320°C and at high strain rate in frequency around 4kHz, was obtained.
