A Preliminary Investigation into the Spall Strength of Cast Iron

摘要

The spall strength of cast iron has been investigated by means of planar plate impact experiments. A single stage gas gun was utilized to drive projectiles to velocities between 200-300 m/sec, resulting in low to moderate shock loading of the cast iron specimens. Measurement of the stress histories were made with the use of commercial manganin stress gauges that were imbedded between the back face of the cast iron specimen and a low impedance backing of polycarbonate. Spall strength values were calculated utilizing the measured peak stress and minimum stress pullback signals captured in the stress history. Spall Strength values were found to vary between 0.7 and 1.2 GPa for the cast iron tested. Non-ideal loading conditions were postulated as the cause of the lower end of the spall strength values.