Modified split Hopkinson bar method for low temperatures

The dynamic strength of industrial materials at low temperatures, especially lower than the temperature of liquid nitrogen, has attracted special interest. In this paper, as an approach to examining the dynamic properties of materials at these low temperatures, a modified split Hopkinson bar method is proposed. In the method, a narrow gap is made between a pressure bar and a specimen. By this method, it is possible to shut off heat conduction between them and to control the temperature of the specimen accurately. Theoretical conditions for good measurement by this method have been examined thoroughly. By carrying out an experiment under these conditions, the effectiveness of this method has been confirmed. (author)