Study On Ultrasonic Nondestructive Evaluation Method And Mechanism Of Stress

With the development and progress of science and technology,the operating conditions of machinery and equipment are increasingly harsh,and the failure of key components has become one of the main reasons for the rapid failure of machinery.Lots of research shows that stress is an important cause of reduced performance of mechanical parts,and the main reason is that yield or fracture occurs,so the stress evaluation has become an important method to ensure the mechanical equipment service condition.Aiming at the problem should force evaluation method limitation,in order to achieve stress easily and quickly,which is suitable for field detection and nondestructive evaluation method as the goal,based on the elastic theory of ultrasonic,ultrasonic evaluation method and mechanism of steel stress.Optimization of ultrasonic signal parameters evaluation,based on the numerical analysis method,calculate the response between step signal amplitude and waveform distortion and characteristic parameters;combined with the static tensile test,constructing characteristic parameters and the mapping relationship between the force should be clear,the ultrasonic stress evaluation method and mechanism;to explore the main factors affecting stress evaluation the influences of various factors to evaluate the stress,the optimization of the evaluation results,the sonic elasticity formula for the steel stress is obtained.This project reflects the intersection of material science and nondestructive testing theory,and provides theoretical support and technical support for nondestructive evaluation of steel stress.