打撃試験による氷の衝撃変形および破壊現象の計測

抄録

It is known that the ice is easily fractured by percussion with back of the metal spoon. However, this mechanism has not been clarified in detail. In the previous study, we carried out the percussion test of the ice specimen using flat plate, which showed that the ice fractured with low stress compared to compression test. In this study, in order to further investigate the fracture phenomenon of the ice, the percussion test was conducted in which hemispherical protrusion simulating the shape of back of the spoon was attached to the tip of the flat plate. The diameter of the hemispherical protrusion used in this study was 10 mm, 15 mm and 20 mm. It was observed that the time to fracture in hemispherical protrusion percussion became shorter than the flat plate percussion. The maximum load was approximately 18-22 N, regardless of the diameter of the hemispherical protrusion. This value is less than 1/10 in comparison with the result of the flat plate percussion test, which indicates that the fracture of the ice occurred with lower load. In addition, it was shown that the maximum load decreased with decreasing the diameter of the hemispherical protrusion.