SHPB法におけるランプ波の生成方法

抄録

Split-Hopkinson pressure bar method based on one-dimensional stress wave theory has been the most reliable and versatile testing method for materials at high rate of deformation, and generation of various kinds of incident wave for the respective tests such as strain rate jump, constant strain rate, and reverse loading, is inevitable requirement in the method. Since the ramped incident wave is fundamental to suppress high frequency vibrations and to obtain the smooth transmitted wave, various kinds of methods have been investigated. In the present paper elastic springs were focused as a buffer to generate ramped incident wave. It was confirmed that an elastic spring could be used instead of traditional metallic buffer. It was also found that the ramped wave with gradual increase at the beginning could be generated by combination of two springs together with the two-stage SHPB method previously proposed by the author. Application of the present method for impact impression test is discussed.