Measurement of dynamic electrical conductivity of MFCG armature material under conditions of shock and high strain rate loading

• Published in: 1999 12th IEEE International Pulsed Power Conference Vol. 2; pp. 708 - 711 vol.2
• Main Authors: Rasty, J., Xiaobin Le, Neuber, A., Jiande Zhang, Dickens, J.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 1999
• Subjects: Annealing; Character generation; Conducting materials; Conductivity measurement; Copper; Electric shock; Electric variables measurement; Magnetic flux; Magnetic materials; Phase change materials
• ISBN: 0780354982; 9780780354982
• DOI: 10.1109/PPC.1999.823611

Characterization of changes in the conductivity during the shock loading process is of paramount importance in estimating the efficiency of magnetic flux compression generators (MFCG). In this study, the main emphasis was the characterization of dynamic conductivity of the armature material during the shock-loading phase. A Split Hopkinson Pressure Bar apparatus was utilized to subject as-received and annealed specimens of OFHC copper to various shock pressures. Experiments conducted to measure the resistivity of Cu specimens indicated that resistivity initially decreases, followed by a sharp increase before decreasing to a steady state value. Depending on the magnitude of the shock pressure, resistivity changes in excess of 200% were recorded.