Abstract
Electric potential technique was applied for determining the size of crack which was initiated and propagating under an impulsive loading. Calibration curve for crack size vs. potential change can be obtained by finite element method or simulating crack growth with a razor on duplicated aluminium foil specimen. The measurement of the electric potential across the crack was made by an oscilloscope. Some commercial 2V batteries was used for the constant current sources.
Dynamic crack propagation was followed in the specimens of stainless steel and 7075-T6 aluminium alloy. It is worth noting that the maximum crack velocity in aluminium specimen was affected by the stress rate.
