Analysis meter for residual stress distribution along depth

Abstract

The invention belongs to the nondestructive testing technical field, and particularly relates to an optical nondestructive testing instrument, namely an analysis meter for residual stress distribution along depth. After emitted by a laser device (1) and passes through a spatial filter (2), a laser is emitted to a large-area holophote (3.1). The large-area holophote (3.1) reflexes the laser to an aspherical mirror, and the light field is changed to be a uniform collimating light field. After being refracted by a three-direction moire composite slab (3.3) and a phase shifter total reflection component (5), the light field irradiates to the surface of a test piece. A control processing system (8) controls a phase shifter on the outer ring of the instrument total reflection component (5), and optical distance is interfered. An image acquisition device (7) acquires a streak image which is formed by the interference of the light field on the test piece through a holophote A, and transmits the image to the control processing system (8). The control processing system (8) controls drilling equipment (6) to drill the test piece. By using the analysis meter for the residual stress distribution along the depth, a user can directly acquire the residual stress distribution data of the teat piece along the depth.

Description

technical field [0001] The invention belongs to the technical field of nondestructive testing, and in particular relates to an optical nondestructive testing instrument. Background technique [0002] The measurement of residual stress and its distribution along the depth direction has always been a difficult and hot point in the study of experimental solid mechanics. The existence of residual stress makes structures unstable or even destroyed. In the field of non-destructive testing, residual stress detection is also listed as an extremely important research field. For example, for port transient loads, the large-capacity power grid can operate stably; but in emergency situations, when using a smaller-capacity backup power station for power supply, the general practice is to increase the capacity of the power station to meet the requirements of special power loads such as ports ; However, the frequent sudden loading and unloading of the unit, the frequent and large fluctuat...

AI Technical Summary

Problems solved by technology

Due to the insurmountable defects of the resistance strain rosette in measuring the release strain of the drilling process, the measurement accuracy of this method is limited.

[0004] At present, there is no such device "resistance strain rosette combined with drilling to measure residual stress and its distribution along the depth" at home and abroad. It only uses the

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