A Deformation Measurement Method Based on Gray Marker Points
A measurement method and technology for marking points, which are applied to measurement devices, instruments, and optical devices, etc., can solve the problems that the digital image correlation method is no longer applicable, inconvenient for spraying, destroying transparency, etc., so as to achieve a deformed measurement result image and simple operation. Convenient, low soiling effect
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[0084] According to a preferred embodiment of the present invention, the area around the point of interest is divided into eight areas.
[0085] In a further preferred embodiment, the region division is performed as follows:
[0086] First, take the centroid of the point of interest as the origin, divide the Cartesian coordinate system, and form 4 quadrants;
[0087] Then, on the Cartesian coordinate system, with the center of mass of the point of interest as the center, two concentric circles are used to divide the area near the point of interest into eight regions.
[0088] In a further preferred embodiment, among the two concentric circles, the radius of the outer circle is the distance between the point of interest and the farthest marker point among the n adjacent marker points;
[0089] The radius of the inner circle is half of the radius of the outer circle.
[0090] Wherein, the radius of the outer circle is set as the distance between the interest point and the fart...
Embodiment 1
[0123] To measure the deformation of a three-point bending equal-strength beam, follow the steps below:
[0124] Step 1, paste 18 white mark points on the surface of one side of the constant strength beam, and the mark points are rigid circular mark points.
[0125] Step 2, use the industrial camera MV-EM130M and the industrial lens (16mm computar lens) to shoot the pre-deformation image of the surface of the equal-intensity beam pasted with white marker points, specifically as figure 2 shown;
[0126] Then the electronic creep testing machine is used to pressurize the equal-strength beam, and then the same industrial camera is used to take the deformed image, as follows image 3 shown.
[0127] Step 3,
[0128] (1) in figure 2 In , use matlab software to identify the landmark points in the image before deformation, and number them in sequence from left to right and from top to bottom in the image, and mark them as P1~P18;
[0129] Use the centroid calculation function ...
Embodiment 2
[0155] The method described in this embodiment is similar to Embodiment 1, the difference is that there are 64 marker points, and 48 nearest neighbor marker points are selected for each marker point, and the image before deformation is as follows Figure 7 As shown, the deformed image is as Figure 8 shown;
[0156] The final vector field diagram obtained after removing outliers is as follows: Figure 9 shown by Figure 9 It can be seen that the displacement trend of each marker point is relatively consistent. Among them, the deformation of the u field is as follows Figure 10 As shown, the deformation of the v field is as follows Figure 11 shown.
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