Stamp type DIC speckle making tool

Abstract

A stamp type DIC speckle making tool, comprising an upper shell, a printing part, a lower shell and a protective cover; the side wall of the upper shell is bonded with the peripheral side of the printing part by glue, and the inner side of the top wall of the upper shell is in contact with the upper top surface of the printing part; a plurality of DIC speckle printing convex columns are engraved on the lower bottom surface of the printing part, the upper shell and the lower shell are connected by buckling to cover the printing part, and the DIC speckle printing convex columns can be extended from the printing opening of the lower shell; the protective cover is connected with the lower shell by buckling, and the closed space formed by the two can cover all the DIC speckle printing convex columns.

Description

Technical Field

[0001] This invention relates to a tool for creating DIC speckle patterns, and more particularly to a stamp-type tool for creating DIC speckle patterns. Background Technology

[0002] Digital Image Correlation (DIC), a non-contact, full-field optical measurement technique, has been widely applied in experimental mechanics, materials science, and engineering testing. Its core principle is to track the grayscale changes of a randomly distributed speckle field on an object's surface before and after deformation, and then calculate the displacement and strain fields using image processing algorithms. The quality of the speckle directly determines the accuracy, stability, and spatial resolution of DIC measurements; therefore, speckle fabrication technology is a crucial prerequisite for achieving high-precision measurements using the DIC method.

[0003] Limitations of traditional speckle pattern production methods:

[0004] Early DIC experiments relied heavily on natural surface textures or simple artificial markings (such as hand-drawn speckles), but their randomness, contrast, and uniformity were difficult to control, easily leading to increased image matching errors, especially in micro-strain measurements or large deformation scenarios where reliability was insufficient. Furthermore, traditional methods could not stably form effective speckles on smooth, reflective, or high-temperature surfaces, limiting the applicability of DIC technology.

[0005] Evolution of modern speckle pattern fabrication technology:

[0006] To meet the demands of high-precision DIC, systematic speckle fabrication technology has developed rapidly, mainly divided into two categories.

[0007] 1. Physical deposition method

[0008] Spraying method: High-contrast pigments (such as black and white matte paint) are atomized and sprayed onto the sample surface through a spray gun or aerosol can to form random spots. The key technology lies in the difficulty of controlling the spraying distance, air pressure and moving speed to ensure the spot size (usually 3-10 pixels) and density (coverage of 30%~60%).

[0009] Transfer printing: This method uses pre-made speckled stickers or water transfer films to adhere to the surface. It is suitable for materials that are not easy to spray (such as biological tissues and flexible electronic devices), but there may be problems with uneven adhesion or interface slippage.

[0010] 2. Digital Generation Method

[0011] Projected speckle method: A computer-generated random speckle pattern is projected onto the surface of the object being measured using a projector. This method requires no physical contact and is particularly suitable for easily damaged surfaces or dynamic real-time measurements. However, it is significantly affected by ambient light and surface reflectivity, requiring rigorous calibration.

[0012] Photolithography / laser etching: Micron-scale speckle patterns are directly prepared on the surface using micro-nano fabrication technology. It has high precision and good stability and is suitable for microscale measurement or high-temperature environments, but the equipment cost is high and the efficiency is low.

[0013] Therefore, there is a need in the existing technology for a DIC speckle fabrication tool that is stable in performance, low in cost, and easy to operate, in order to solve the above problems. Utility Model Content

[0014] This invention provides a stamp-type DIC speckle production tool, which has the advantages of simple structure, low manufacturing cost and easy operation compared with the prior art.

[0015] A stamp-type DIC speckle production tool includes an upper housing, a printing section, a lower housing, and a protective cover;

[0016] The sidewall of the upper housing is bonded to the periphery of the printing part with adhesive, and the inner side of the top wall of the upper housing is in contact with the top surface of the printing part.

[0017] The bottom surface of the printing part is engraved with a plurality of DIC speckle printing protrusions. The upper and lower housings are connected by a snap fastener to cover the printing part, and the DIC speckle printing protrusions can extend out from the printing opening on the lower housing.

[0018] The protective cover and the lower shell are connected by a snap-fit, and the enclosed space formed by the two can cover all the DIC speckle printing protrusions.

[0019] Furthermore, a handle and an oil filling hole are fixedly provided on the upper housing.

[0020] Furthermore, the height of the DIC speckle printing protrusions is 3-4 mm.

[0021] Furthermore, the length of the DIC speckle printing protrusion extending out of the plane where the printing port is located is 1-2 mm.

[0022] This utility model can achieve the following beneficial effects:

[0023] This utility model has fewer types of parts, a reasonable and simple constraint unit design, and lightweight individual components, making it easy to process and transport. It is simple to connect, safe and reliable, reduces the amount of engineering work and resource consumption, and saves labor.

[0024] Improved efficiency: Traditional manual dotting or stencil spraying takes several hours, while this invention significantly improves efficiency, making it particularly suitable for the testing needs of laboratory concrete test blocks.

[0025] This invention adds an external oil injection hole, which reduces the number of times dye needs to be applied repeatedly, effectively reducing working time. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the printing section of this utility model;

[0028] Figure 3 This is a schematic diagram showing the positional relationship between the lower housing and the printing part of this utility model;

[0029] Figure 4 This is a DIC speckle effect image printed using this utility model.

[0030] In the figure, 1-upper shell, 2-printing part, 3-lower shell, 4-outer cover, 5-DIC speckle printing protrusion, 6-printing port, handle, 7-oil filling port, 8-printing port. Detailed Implementation

[0031] like Figures 1-3 As shown, a stamp-type DIC speckle production tool includes an upper housing 1, a printing part 2, a lower housing 3, and a protective cover 4.

[0032] Both the upper housing 1 and the lower housing 2 are rectangular structures and are detachably connected by snap-fit. After the upper housing 1 and the lower housing 2 are combined, they form an accommodating space. The printing part 2 is disposed in this accommodating space. Specifically, the periphery of the printing part 2 is bonded to the side wall of the upper housing with glue, and the top surface of the printing part 2 is in contact with the inner side of the top wall of the upper housing 1. This arrangement can ensure the ink absorption effect of the printing part 2.

[0033] The printing section 2 is made of high-density polyurethane foam, which has the characteristics of high hardness, good elasticity, and uniform ink absorption. A plurality of DIC speckle printing protrusions 5 are engraved on the bottom surface of the printing section 2, and the DIC speckle printing protrusions 5 can extend from the printing opening 6 on the lower housing 2. The height of the DIC speckle printing protrusions 5 is preferably set to 3-4mm, and the length of the DIC speckle printing protrusions 5 extending out of the plane of the printing opening 6 is preferably set to 1-2mm. It should be noted that the lower housing 2 can effectively prevent excessive compression of the DIC speckle printing protrusions 5.

[0034] To facilitate operation and ink addition, in this embodiment, a handle 7 and an oil inlet 8 are also fixedly provided on the upper housing 1;

[0035] In order to protect the DIC speckle printing protrusions 5, in this embodiment, a protective cover 4 is also provided that is detachably connected to the lower housing 2 by a snap fastener. When not in use, the enclosed space formed by the two can cover all the DIC speckle printing protrusions 5.

[0036] The working principle of this utility model is briefly described below:

[0037] In use, first add an appropriate amount of ink to the printing section 2 through the ink injection hole 8. Then, place the entire printing tool vertically and rotate it several times to ensure that the printing section 2 absorbs the ink evenly and fully. After that, remove the protective cover 4, hold the handle and press it onto the predetermined position on the concrete until the lower housing 2 is in complete contact with the concrete surface and cannot be pressed further. At this time, the DIC speckle printing protrusions 5 will form DIC speckle marks on the concrete surface (see...). Figure 4 Finally, lift the entire printing tool, being careful not to let it slide relative to the concrete surface during the lifting process, so as to avoid damaging the DIC speckle imprint.

[0038] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any equivalent substitutions and modifications made by those skilled in the art without departing from the guidance of the present utility model shall be deemed to fall within the protection scope of the present utility model.

Claims

1. A stamp-type DIC speckle creation tool, characterized in that: It includes an upper housing, a printing section, a lower housing, and a protective cover; The sidewall of the upper housing is bonded to the periphery of the printing part with adhesive, and the inner side of the top wall of the upper housing is in contact with the top surface of the printing part. The bottom surface of the printing part is engraved with a plurality of DIC speckle printing protrusions. The upper and lower housings are connected by a snap fastener to cover the printing part, and the DIC speckle printing protrusions can extend out from the printing opening on the lower housing. The protective cover and the lower shell are connected by a snap-fit, and the enclosed space formed by the two can cover all the DIC speckle printing protrusions.

2. The stamp-type DIC speckle production tool according to claim 1, characterized in that: A handle and an oil filling hole are fixedly installed on the upper housing.

3. The stamp-type DIC speckle production tool according to claim 1, characterized in that: The height of the DIC speckle printing protrusions is 3-4 mm.

4. A stamp-type DIC speckle production tool according to claim 1 or 3, characterized in that: The length of the DIC speckle printing protrusion extending beyond the plane of the printing port is 1-2 mm.

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