Ultrasonic imaging method for polymer bonded explosive surface crack detection and device

Abstract

The invention discloses an ultrasonic imaging method for polymer bonded explosive surface crack detection and device. A transducer for detecting a surface crack of a detected material is used as a sensor, array sensors are arranged on non-destructive and destructive detection pieces respectively, ultrasonic waves of a certain frequency are excited, reference signals in a non-destructive case and destructive signals in a destructive case when passing through each path are collected, the SDC value and the spatial distribution function of each path are calculated by using the reference signals and the destructive signals, and according to the SDC value and the spatial distribution function of each path, the image of a destructive detection piece detection area is reconstructed. An improved correlation analysis-based probability destruction reconstruction algorithm is adopted, the sensor array mode is optimized for cracks with complex structures and shapes, and through collection and processing of time domain signals, non-destructive evaluation on the crack with a complex shape on the surface of the polymer bonded explosive can be effectively realized.

Description

technical field [0001] The invention discloses a non-destructive evaluation method and device for imaging cracks on the surface of polymer bonded explosives using a probabilistic damage reconstruction algorithm based on correlation analysis. According to the International Patent Classification (IPC), it belongs to the technical field of material testing, specifically A technique for the non-destructive evaluation of materials by processing received response signals. Background technique [0002] Polymer bonded explosive is a particle-filled composite material, with high-energy explosive crystals as the main body, and is fixed together by a polymer binder. It has the characteristics of high energy density, excellent mechanical properties and high safety performance. It is widely used in military and civilian applications. Wide range of applications. However, cracks may occur during production, processing, transportation and storage, especially the existence of surface cracks...

AI Technical Summary

Problems solved by technology

[0004] At present, the probabilistic damage reconstruction algorithm based on correlation analysis (RAPID) is mostly used for imaging defects in metal materials, and most of the defects are regular shapes such as circles or squares, while there are few studies on crack imaging, especially crack defects with complex shapes.

In addition, the research on explosives in the field of ultrasonic nondestructive testing mainly focuses on the qualitative analysis of damage under the influence of external force or temperature, or uses wave velocity or attenuation to evaluate material properties. The imaging method of surface cracks in polymer bonded explosives needs further research. develop

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