Ferromagnetic component non-directional alternating-current electromagnetic field stress measurement sensor

Abstract

The invention relates to a ferromagnetic component non-directional alternating-current electromagnetic field stress measurement sensor, which comprises an orthogonal excitation module and an orthogonal detection module, and is characterized in that the orthogonal excitation module comprises two excitation coils and two U-shaped frameworks, and is used for inducing a uniform alternating-current electromagnetic field rotating at a constant speed on the surface of a detected workpiece; the orthogonal detection module comprises four detection coils and a detection framework and is used for pickingup surface stress information of a workpiece. The two exciting coils are orthogonal to each other, sinusoidal signals with the same frequency / amplitude and the same phase difference of 90 degrees arerespectively introduced to generate a rotating uniform alternating-current electromagnetic field, so that the sensor has high detection sensitivity to stress in any direction, and the two orthogonalcoil groups are perpendicular to each other at the angle difference of 45 degrees to form a detection unit. The principal stress direction can be judged through one-time scanning, and meanwhile the measurement efficiency and sensitivity of the sensor are improved.

Description

technical field [0001] The invention relates to the field of non-destructive stress measurement, in particular to a non-directional AC electromagnetic field stress measurement sensor for ferromagnetic components. Background technique [0002] Ferromagnetic components are widely used in industries such as aerospace, high-speed railway, construction, shipbuilding, and automobiles. During service, components are easily affected by external loads and surrounding environments to generate stress concentration, which leads to changes in the performance of components and eventually initiates microcracks. Therefore, It is necessary to measure the stress concentration state of the component, especially the critical stress-strain state before crack generation. [0003] At present, there are many non-destructive measurement techniques for the stress of ferromagnetic components. Among them, the metal magnetic memory detection technology can detect the stress state and determine the stres...

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Problems solved by technology

The X-ray diffraction method is more sensitive to the macroscopic or microscopic residual stress on the component surface, but the detection effect is greatly affected by the grain size of the material and the equipment is expensive

Ultrasonic measurement must use couplant and the test results are greatly affected by the structure of the material

Chinese patent ZL201310469512.8 proposes a ferromagnetic component stress measurement device and its measurement method, which improves the stress measurement speed and can determine the direction of the principal stress, but is only sensitive to the direction of the principal stress of the component and requires multiple scans. Determine the principal stress direction, not suitable for some detection occasions that require high efficiency, high sensitivity and unknown stress direction

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