Experimental study of ultrasonic relaxation of residual stresses in the elastic plates

The article describes a method of ultrasonic relaxation of residual stresses in elastic circular plates used in the sensors of gas and liquid overpressure control. The method is based on the use of the energy of ultrasonic vibrations imparted to an elastic plate, which causes gradual accumulation and subsequent relaxation of residual stresses and strains. In order to test the adequacy of the mathematical description of the ultrasonic relaxation mechanism, and to establish the dependencies of residual strain on technological factors, an experiment has been carried out. An ultrasonic setup was developed to perform the experimental part. As a result of the experiment an empirical power-law dependence of residual strain on the amplitude of the ultrasonic vibrations, the duration of machining and the static load was obtained. This dependency is shown on the corresponding graphs. The graphs demonstrate the behavior of the residual strains at different technological modes of ultrasonic processing.