Ultrasonic Vibroacoustic Processes, Excited By Heating By Impulse Currents of Metals

When passing impulse currents through a conductor, powerful vibro-acoustic oscillations are generated in it. The parameters of these oscillations are easy to control. Changing the duty cycle of pulses allows for such equipment as welding with the allocation of a large amount of heat, and regimes of controlled cooling and ultrasonic quality control of the welded joint. Keywords: welding, vibration, pulse current, diagnostics, ultrasoun

Electroplastic Processing of Titanium Implants

The results of experimental studies of samples of titanium for implants when exposed to pulsed electric currents. Excitation of longitudinal and transverse vibrations to the sample under these influences can be used in their electroplastic processing and introduction into the bone tissue. When exposed to pulses of surface layers of titanium sample are experiencing significant dynamic load. The possibility of increasing amplitudes with decreasing duration of pulses of electric current was shown. This allows to exclude the heating of implants during such impacts. The peculiarities of ponderomotive effects in titanium samples related to its uniqueelectrical and mechanical properties, precluding the practical manifestation of the classic skin-effect and its impact on the generation of oscillatory processes in the moments of passage of the leading and trailing edges of current pulse. Keywords: titanium, implant, vibration, acceleration, magnetic field, skin effect

Analysis of the Relationships for the Vibrational Response to the Excitation of Vibro-acoustic Processes in Conductors from the Action of a Pulsed Current

Evaluation of the mechanisms of formation of mechanical deformations is of great importance for the practical application of the electroplastic effect. Estimations of the efficiency of conversion of the energy of the electric pulse in the energy of the magnetic field and mechanical oscillations are obtained. Keywords: pulse current, metal, vibroacoustic, magnetic field, vibration sensors