Neutron diffraction residual stress determination device and method

Abstract

The invention discloses a neutron diffraction residual stress determination device and a method. The device is characterized by using the reactor neutron source, carrying out monochromatization by a monochromator to obtain a required monochromatic neutron beam at a certain wavelength, and using the neutron beam to detect the residual stress. According to the invention, because the neutrons are uncharged, and when the neutrons interact with substance, the neutrons have no effect with extranuclear electons, charge Coulombian force obstacle has no need to overcome, thus low energy neutrons can enter in atoms; the neutron absorption of great majority of materials is low, thus the penetration depth of incoming neutron beam is deep. Simultaneously by collimator and slit collimation, the limitedneutron beam has high space resolution ratio, a three-dimensional lossless and deep stress test of a test piece is realized by translation of three directions which are vertical to each other and rotation around testing central point, and the defect that an X-ray and a synchrotron radiation residual stress determination device can only losslessly determine the residual stress of the crystal material surface and subsurface is overcome.

Description

technical field [0001] The invention relates to the technical field of residual stress detection, in particular to a neutron diffraction residual stress measurement device and method. Background technique [0002] When mechanical parts or large components are manufactured, various processes often leave residual stress on it (the residual stress inside the material after the external force is removed); other manufacturing processes, such as shot peening and rolling, are designed to Add appropriate residual stress to the workpiece. In the manufacturing process, appropriate and reasonably distributed residual compressive stress may become a factor to improve fatigue strength and stress corrosion resistance, thereby prolonging the service life of parts and components; inappropriate residual stress will reduce fatigue strength and generate stress Corrosion, loss of dimensional accuracy, and even early failure accidents such as deformation and cracking. Therefore, the residual s...

AI Technical Summary

Problems solved by technology

Delamination will cause the release of residual stress. Samples with simple shapes can be corrected for residual stress delamination according to a certain formula, but workpieces with complex shapes cannot be corrected.

In addition, the delamination measurement workload is large, the measurement accuracy is poor, and it is a destructive measurement method

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