Microcrack nondestructive detecting device and method

Abstract

The invention discloses a microcrack ultrasound-sound emission nondestructive detecting device and method, relating to technique that an ultrasound transmitter generates an excitation source and then a sound emission technique is adopted to detect the microcrack damage in a member, that is, the ultrasound transmitter generates the excitation source on the surface of the member, a sound emission acquisition processing system acquires, amplifies, processes and analyzes a signal to obtain a non-linear characteristic parameter of the signal, and then existence of the microcrack damage in the detected member and the damage degree are judged. The device comprises the ultrasound transmitter, a sound emission sensor, a pre-amplifier, and a sound emission acquisition analyzing system. According to the invention, the ultrasonic technology and the sound emission technique are combined to construct a nondestructive detecting system having the functions of detecting static defects and dynamic defects, the microcrack of the member is detected, the member is rapidly integrally evaluated, and the defects that an existing sound emission method cannot detect the static defects and the ultrasound detection method is low in detecting efficiency and has difficulties in capturing the microcrack are overcome.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing, in particular to a micro-crack non-destructive testing device and method. Background technique [0002] High-end mechanical equipment components in important industries of the national economy (such as construction machinery, ships, nuclear power, aerospace, etc.) have great utilization value after they are decommissioned once, so their remanufacturing has attracted great attention. Remanufacturing is guided by the theory of the whole life cycle of products, with the goal of leapfrog improvement in the performance of waste products, with high quality, high efficiency, energy saving, material saving, and environmental protection as the criteria, and with advanced technology and industrialized production as means to repair, The general term for a series of technical measures or engineering activities to transform waste products. After the remanufactured blank (waste part) has exper...

AI Technical Summary

Problems solved by technology

At present, the inspection process for remanufactured blanks is manual preliminary screening-cleaning-conventional non-destructive testing, but there are a large number of missed inspections in the manual screening process, and the process of cleaning the missed inspection components first and then testing is very labor-intensive; conventional non-destructive testing mainly uses ultrasonic waves method, which is insensitive to the presence of micro-cracks in the tested components

Due to the extremely complex service conditions of most remanufactured components, and when the remanufactured components are running, they cannot be detected and lack quantitative damage detection

Therefore, in general, the current detection methods have disadvantages such as high cost, poor reliability, narrow application range, and inability to take into account the dynamic cracks and static cracks of the remanufactured blank at the same time.

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