A Method for Measuring Residual Stress of Textured Materials Using X-ray
A residual stress and X-ray technology, applied in the field of non-destructive testing, can solve the problems of cumbersome, limited application, complex calculation methods, etc.
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Embodiment 1
[0029] The tested sample is a copper alloy strip with strong texture after cold rolling and large deformation. Its length is 100mm, its width is 60mm, and its thickness is 0.5mm. The surface of the workpiece is prefabricated with a compressive stress field to improve fatigue resistance. The test steps and methods are as follows:
[0030] 1) First, the texture types of the workpiece are determined by X-rays, mainly including B{011}, C{211} and R{124}, and their volume contents account for 42.6%, 32.1% and 13.8%, respectively. %, draw the (311) crystal plane pole figure ( image 3 );
[0031] 2) When measuring stress, the diffraction crystal plane selected for testing is (311), and the inclination angle (Ψ) is selected: in the range of Ψ=0°-90°, the interval is 1°;
[0032] 3) if image 3 As shown, on the (311) crystal plane pole figure, it is 39° to RD Measured d ψ -sin 2 The relationship curve of ψ, where ψ is 42°, there is a C{211} texture, and the curve i...
Embodiment 2
[0043] The tested sample is an aluminum alloy strip with strong texture, its length is 2000mm, its width is 600mm, and its thickness is 2.00mm. The workpiece has been bent and formed, and there is a large residual stress. The test steps and methods are as follows:
[0044] 1) Firstly, the texture types of the workpiece are determined by X-rays, mainly including rotating cube {011} and {112}, and their volume contents account for 50.2% and 27.6.1% respectively, and the (311) grain Polar diagram;
[0045] 2) When measuring stress, the diffraction crystal plane selected for testing is (311), and the inclination angle (Ψ) is selected: in the range of Ψ=0°-90°, the interval is 1°;
[0046] 3) if image 3 As shown, on the (311) crystal plane pole figure, it is 35° to RD Measured d ψ -sin 2 The relationship curve of ψ, where ψ is 65°, there is {011} texture, and the curve is linear around ψ=42°, the lattice distortion constant d of {011} texture in the sample is mea...
Embodiment 3
[0057] The tested sample is a stainless steel automobile plate with strong texture, its length is 1500mm, its width is 500mm, and its thickness is 0.80mm. The workpiece has been processed by drawing and bending, and there is a large residual stress. The test steps and methods are as follows:
[0058] 1) First, the texture types of the workpiece are determined by X-rays, mainly R{124} and C{112}, and their volume contents account for 46.2% and 23.6.1% respectively, and the (111) grain Polar diagram;
[0059] 2) When measuring stress, the diffraction crystal plane selected for testing is (111), and the inclination angle (Ψ) is selected: in the range of Ψ=0°-90°, the interval is 1°;
[0060] 3) if image 3 As shown, on the (311) crystal plane pole figure, it is 53° to RD Measured d ψ -sin 2 The relationship curve of ψ, where ψ is 51°, there is {011} texture, and the curve is linear around ψ=51°, the lattice distortion constant of R{124} texture in the sample is ...
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