Stress concentration and fatigue damage detector based on characteristic magnetic conductivity

Abstract

The invention relates to a stress concentration and fatigue damage detector based on characteristic magnetic conductivity, which comprises an excitation coil, a detection coil, a power amplification circuit, a low noise signal amplification circuit, a data acquisition analog-to-digital conversion circuit, a DSP (Digital Signal Processor) control and signal module, a display module circuit and the like, and is characterized in that: the excitation coil is connected with the power amplification circuit; the detection coil is connected with the low noise signal amplification circuit; the DSP control and signal module is connected with an ARM module through an HPI (High Power Inhibit) circuit bus interface; and the ARM module is connected with the display module circuit. The stress concentration and fatigue damage detector based on the characteristic magnetic conductivity has the technical characteristics of: (1) high detection accuracy: only a signal conditioning circuit in the instrument is realized by adopting an analog circuit, and other circuits in the instrument are realized by adopting digital circuits for carrying out digital signal processing and control; (2) high integration and dual cores: adopting an embedded instrument design concept, and using dual-core mode with ARM control and DSP operation; and (3) simplicity and convenience in use: the detector has a small size, does not need to depend on a PC (Personal Computer) in a detection process, can be used for completing display and data storage of a detection signal independently, and is convenient for carry and various outdoor detection operations.

Description

technical field [0001] The invention relates to a detector, in particular to a stress concentration and fatigue damage detector based on characteristic magnetic permeability. Background technique [0002] As we all know, metal materials are widely used as stress components, and are widely used in aerospace, electric power, railways, pressure vessels and other industries. During the use of components, under the action of stress, fatigue load, internal working medium or external working environment, it is easy to generate stress at the groove, loose area, defect cavity dislocation concentration area, stress concentration area, weld seam and its heat-affected area Phenomena such as corrosion cracking or fatigue fracture cause major vicious accidents and great disasters to the country and the people. Therefore, in the non-destructive testing of components, it is of great significance to quickly, conveniently and accurately detect the severe areas of stress concentration and ...

AI Technical Summary

Problems solved by technology

At present, the methods for early detection and evaluation of ferromagnetic specimens include metal magnetic memory detection method, Barkhausen effect detection method and acoustic emission detection method, but the detection technology and effect have their own limitations, and they are still immature. in-depth research and improvement

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