Research Of Ultrasonic Scattering Computation And Measurement Techniques Of Defects In Solids

In order to study the interaction mechanism between ultrasonic waves and defects insolids, the paper conducted in-depth research by using finite element simulation anddynamic photoelastic method.On the one hand, simulating the propagation characteristics of ultrasound in solids bythe finite element simulation method. Firstly, taking the ultrasonic propagation velocity inthe medium as a reference amount, analyzing and verifying the feasibility of ANSYS tosimulate the propagation characteristics of ultrasonic waves in solids; Secondly, usingANSYS to simulate the interaction mechanism of ultrasonic waves and typical defects,like holes and cracks, and analyzing the interaction mechanism between these two defectswith ultrasonic waves.On the other hand, based on the principles of static photoelastic and stroboscopicimaging, designing and developing a dynamic photoelastic observation device to study thepropagation characteristics of ultrasonic waves in solids. The dynamic photoelasticobservation device consists of elastic module and strobe light control module. Elasticmodule shows the size of stress in the form of light strength, and demonstrating by lightand dark stripes. Strobe control module is mainly used to compensate for the lacks ofstatic photoelastic principle and to achieve synchronic delay control of sound and light.According to the principle of stroboscopic imaging timing requirements, using Veriloghardware description language to control FPGA (Field Programmable Gate Array)platform, and achieving the experimental device control, and then, through amplificationcircuit to drive LED strobe light, at last, achieve requirements of ultrasonic visualizationdesign successfully.