Residual stress dynamic distribution ultrasonic array chromatography detecting and monitoring method

Abstract

The invention relates to a residual stress distribution ultrasonic array chromatography detecting and monitoring method. The method adopts ultrasonic array to obtain detection data, is suitable for measuring the average distribution of the residual stress in a detected member, and allows acoustics image reconstruction of the average distribution state and the area position of the residual stress in the detected member to be carried out. The ultrasonic array chromatography detecting method is realized on the basis of a local signal difference principle. An ultrasonic oblique incidence technology is adopted to obtain critical refraction longitudinal waves, background data under a residual stress-free condition is collected by adopting a transmission technology in the detection process, ultrasonic array data under a residual stress condition is collected through the transmission technology, and an image is reconstructed through comparing the local detection signal and the background signal under the residual stress-free condition and the residual stress condition and combining the weight coefficient of the appearance probability of the residual stress distribution in the detected member. Pixel points in the image represent the transit time difference change attribute of the sound waves passing through the residual stress area, so the distribution state and the position of the residual stress can be differentiated. Influences of the quantity and the arrangement mode of arrays on the residual stress distribution and influences of an excitation frequency on the detection depth of the residual stress are analyzed through the residual stress chromatography imaging method.

Description

1. Technical field [0001] The invention relates to an array detection method for non-destructive testing and monitoring of residual stress distribution and dynamic distribution in a local area of ​​a component. Detection method and signal statistical characteristics, so as to realize ultrasonic tomographic detection of local residual stress, and realize detection and monitoring of residual stress distribution state in components. 2. Background technology [0002] Residual stress is the physical source of deformation and cracks in various metal components. Accurate and non-destructive detection of residual stress distribution in components is the premise to ensure component quality and safe operation. Residual stress distribution is an important indicator of the safety of metal components, which directly reflects the The quality and reliability status of the component. The manufacturing and service process will inevitably produce residual stress in the component. The residua...

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Problems solved by technology

[0006] Literature search found that there are many ultrasonic tomography detection methods for defect detection, but there are no reports at home and abroad on ultrasonic array tomography detection methods for residual stress distribution

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