Integration detection system of pulse eddy current stress cracking and method thereof

Abstract

The invention discloses an integration detection system of pulse eddy current stress cracking and a method thereof. The system comprises a signal stimulating module, a magnetic sensor module, a strain-gauge bridge module, a signal conditioning module, a data acquisition module and a computer processing module. In the method, on the basis of combining pulse eddy current excitation coils with strain-gauge sensitive elements, the required differential stable value for strain measurement and the required differential transient value for pulse eddy current measurement are obtained, and a two-dimensional magnetic sensor array is adopted to carry out high-resolution magnetic response imaging; and by adopting a simulation test and an actual test, signal separation, feature extraction and data fusion are performed to achieve simultaneous on-line detection of material surface defects, subsurface defects and stress and microstructure state, achieve recessive defect judgment of materials and estimation of defects which are not formed, and provide necessary information for health monitoring and life estimation of an aircraft structure.

Description

technical field [0001] The invention designs a pulse eddy current stress crack integrated detection system based on an integrated coil and a sensor array, and belongs to the technical field of stress crack dynamic testing and calibration. Background technique [0002] Under the conditions determined by material characteristics and structural design, the service life and health status of aircraft structural parts are mainly affected by loading forces during flight, enemy weapon attacks, external environmental erosion, and hidden defects and internal residual stress in the processing of materials themselves. and other influences. As the service life increases, the aircraft is prone to small cracks on the surface and inside of its structure, and corrosion occurs after the second layer of the layered structure and around the fasteners. The existence of these defects has caused serious damage to the aircraft structure, and defects can be found in time. Accurate assessment of the...

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Problems solved by technology

The main problem is that the resistance value of the strain gauge drifts seriously due to the influence of temperature, so it is generally difficult to use for long-term online detection; through a large number of material tensile experiments, the relationship between stress-strain and eddy current signals during loading shows that within the elastic range, The eddy current signal and stress-strain do have a good linear relationship, which is not affected by temperature drift factors

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