A comparative study of prediction of flaw response and flaw detection in polycrystalline materials

摘要

The aim of this paper is to perform a comparative study of flaw response with the grain noise signal in an ultrasonic pulse echo simulation. This is one of the analytical methods to determine the flaw response. The flaw response is predicted using the approximation techniques like Kirchoff approximation, Born approximation and modified Born approximation. The grain noise signal generated in addition to flaw response is modelled analytically. By comparing the results of predicted flaw response and grain noise signal, the possibility of flaw detection can be estimated. Here the flaw considered for study is a spherical void and the material selected for study is a polycrystalline metal. Firstly, the comparison is made for 1MHz circular transducer and secondly the study is performed for different center frequencies of transducer.