A measurement system that simultaneously digitizes acoustic emission pulses in stress-corrosion cracking processes and gauges the electrical resistance variations caused by crack growth has been developed. This tool has allowed us to study the relation between the magnitudes measured by the two systems in stress-corrosion cracking processes in high-strength low-alloy steels. The information provided by acoustic energy, number of bursts and number of acoustic emission counts is analysed, as is the influence of the choice of threshold level in the pulse-detection systems. Joint use of both techniques helps with physical interpretation of the measured acoustic emission magnitudes.
An experimental setup which simultaneously registers induced Barkhausen pulses and short time variations in electrical resistance has been developed. The skin effect associated with the use of an alternating current of 100 kHz reduces the volume of the sample which is sensitive to the passing of the current, making it possible to detect the rapid modifications in resistance in a standard Ni thermocouple wire subjected to a slowly varying magnetic field. The combination of both techniques clearly shows the association between jumps in resistance and the dynamics of some magnetic domains.
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