Reliability Simulation Research for Nondestructive Ultrasonic Structure Testing Based on In Situ Influential Factors

Abstract

The reliability simulation of ultrasonic nondestructive testing (NDT) based on the COMSOL Multiphysics simulation software is used to research the influence factors of the angle between the sound beam axis and the crack orientation, and the crack burial depth. First, the COMSOL Multiphysics simulation models of ultrasonic NDT are established to obtain the ultrasonic detection amplitude of cracks with the same size at different angles or crack burial depths. According to different crack lengths, the simulation of ultrasonic detection amplitude under different angles or crack burial depths are carried out, and the probability of detection (POD) curve forms, such as Weibull and Lockheed function, refereed so as to determine the optimal POD curve form considering the influence of angle or crack burial depth. Finally, the minimum detectable crack size with 90% detection probability considering the influence of angle or crack burial depth can be inversed, thus a simulation method of ultrasonic NDT reliability based on COMSOL Multiphysics is formed. The simulation results show that the POD curves and minimum detectable crack size at different angles or crack burial depths in a specific structure are effectively obtained through the proposed method. It can provide some suggestion for the formulation of an ultrasonic testing scheme affected by angle and crack burial depth in engineering practice.