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The use of ultrasonic signals and optical method to estimate the damage of materials after fatigue loading
Summary
This study investigates the influence of fatigue loading on ultrasonic parameters and microplastic characteristics of steels, developing a phenomenological theory connecting pre-crack damage accumulation with acoustic and microplastic parameters, and showing that combined NDT methods offer earlier damage detection.
The influence of fatigue load of steels on parameters of ultrasonic and microplastic characteristics has been studied. A phenomenological theory, which connects process of damage accumulation (before appearance of crack) under fatigue loading with acoustic parameters and microplastic parameters, has been developed. Experimental studies showed that the combination of nondestructive methods of control (acoustical and optical) allows one to estimate the state of materials at an early stage of destruction in both low-cycle and high-cycle areas.