Variation of Electro-conductive Property of SSF/PP System under Impact Loading using a Modified SHPB

Abstract

In order to detect the variation of electro-conductive property of short steel fiber (SSF) filled polypropylene (PP) under impact loading, a modified split Hopkinson pressure bar (M-SHPB) is suggested. Such M-SHPB is constructed by designing a new test electrocircuit, and connecting it to the specimen and oscillograph. On the other hand, a copper foil cover is designed and placed on the whole SHPB equipment for avoiding disturbance of electromagnetic wave existing in the testing environment. By means of M-SHPB, the relation between the resistance and dynamic stress or dynamic strain is effectively detected. The experimental results indicate that the resistance of the material decreases with the increase of strain or stress.