Preparation method of transparent rock-like sample with controllable mechanical properties

Abstract

The invention discloses a preparation method of a transparent rock-like sample with controllable mechanical properties, and belongs to the field of preparation of transparent rock-like materials, and the preparation method comprises the following steps: based on a high-precision 3D printing technology and a pre-established pore-containing sample model, taking photosensitive resin as a rock-like base material, and curing a photosensitive resin material in a non-pore region by controlling ultraviolet light to obtain a transparent rock-like sample with controllable mechanical properties; furthermore, a transparent rock-like sample with certain porosity and controllable mechanical properties is prepared. On the premise of ensuring high transparency, the mechanical property of the transparent rock material can be adjusted by controlling the size of the porosity so as to simulate different rock materials, and the transparent rock material has the advantages of high transparency and controllable mechanical property.

Description

Technical Field

[0001] The present invention belongs to the field of transparent rock-like material preparation, and in particular relates to a method for preparing a transparent rock-like sample with controllable mechanical properties. Background Art

[0002] In geotechnical engineering, mining engineering, petroleum engineering, and other fields, in-depth research on the mechanical behavior and failure mechanisms of rock materials is crucial for ensuring engineering safety and improving resource extraction efficiency. Due to the complexity, heterogeneity, and difficulty in obtaining natural rocks, researchers often need to prepare rock-like specimens with similar mechanical properties for laboratory experiments.

[0003] In recent years, transparent rock-like materials have garnered widespread attention due to their unique advantages in enabling intuitive observation of crack initiation and propagation within specimens. By using rock-like specimens made from transparent materials, combined with visualization techniques such as high-speed cameras, it is possible to effectively capture internal phenomena that are difficult to observe in traditional opaque rock specimen experiments, providing a new approach to rock mechanics research.

[0004] Existing methods for preparing transparent rock-like specimens usually use transparent resins (such as epoxy resins, polyurethane, etc.) for casting and molding. Although this type of method can obtain rock-like specimens with a certain degree of transparency, their mechanical properties mainly depend on the properties of the selected material itself. Once the material is selected, the strength, elastic modulus and other mechanical properties of the prepared specimen are relatively fixed. This means that if it is necessary to simulate multiple rock types with different mechanical properties (for example, hard rock, soft rock, rock under different confining pressures, etc.), it is necessary to change the ratio of the basic materials or even use completely different materials. This is not only complicated and time-consuming to operate, but also difficult to accurately control the range and continuity of changes in mechanical properties, which greatly limits the application scope of existing transparent rock-like materials in simulating different geological conditions.

[0005] Therefore, how to develop a transparent rock sample preparation technology that can ensure high transparency and achieve on-demand regulation of mechanical properties (for example, by adjusting a certain parameter to systematically change the mechanical properties of the sample) is a technical challenge and urgent need currently facing this field. Summary of the Invention

[0006] To solve the above technical problems, the present invention provides a method for preparing a transparent rock-like sample with controllable mechanical properties, comprising:

[0007] Obtain a transparent photosensitive resin solution and construct a transparent three-dimensional rock model based on its mechanical properties;

[0008] Importing the transparent rock three-dimensional model into a 3D printer to process the transparent photosensitive resin solution to obtain a solid model;

[0009] The solid model is polished after removing the supporting structure to obtain a transparent rock-like sample.

[0010] Preferably, the properties of the transparent photosensitive resin solution include: a density of 1.12 g / cm 3 The appearance is close to colorless, transparent and viscous liquid, and it shows a curing depth of 0.08mm under the action of 355nm wavelength laser.

[0011] Preferably, the mechanical properties include: uniaxial compressive strength, elastic modulus, tensile strength, brittleness, cohesion and internal friction angle.

[0012] Preferably, the calculation expression of the mechanical property is:

[0013] UCS=-0.32*n+98.44;

[0014] E = -0.04*n+2.18;

[0015] TS = -0.24*n+8.56;

[0016] B = -0.22*n+12;

[0017] c = -0.48*n+14.67;

[0018]

[0019] Among them, UCS is uniaxial compressive strength, E is elastic modulus, TS is tensile strength, B is brittleness, C is cohesion, is the internal friction angle, and n is the porosity.

[0020] Preferably, the process of obtaining the entity model includes:

[0021] Importing the transparent rock three-dimensional model into a 3D printer for printing;

[0022] During the printing process, the 3D printer digitally slices the model layer by layer. The laser emits an ultraviolet laser beam to scan the surface of the liquid resin. After each layer is cured, the workbench moves a distance of the layer thickness to perform ultraviolet light curing on the next layer until the solid model is printed layer by layer.

[0023] Preferably, in the process of performing layered digital slicing on the model, the thickness of the layered slices of the model is 0.1 mm.

[0024] Preferably, the laser emits an ultraviolet laser beam, and in the process of scanning the surface of the liquid resin, only the non-porous area is cured by ultraviolet light, while the porous area is protected from ultraviolet light.

[0025] Preferably, the process of obtaining the entity model further includes:

[0026] The porosity value n is set according to the reference value of mechanical properties, and a three-dimensional model of a transparent rock with circular holes and a porosity of n is established using computer modeling technology, and an STL file is output;

[0027] According to the output STL file, the STL three-dimensional model file is imported into the 3D printer system, and the model is digitally sliced ​​in layers through the 3D printing computer control system to obtain the contour information of each layer of the specimen.

[0028] On the other hand, the present invention further provides an electronic device, comprising a memory, a processor, and a computing program stored in the memory and executable on the processor, wherein the method is implemented when the processor executes the computing program.

[0029] On the other hand, the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program implements the method when executed by a processor.

[0030] Compared with the prior art, the present invention has the following advantages and technical effects:

[0031] The present invention addresses the drawback of fixed mechanical properties in current methods for producing transparent rock-like materials and provides a method for preparing transparent rock-like specimens with controllable mechanical properties. Based on high-precision 3D printing technology and a pre-established porous specimen model, a photosensitive resin is used as the rock-like base material. By controlling ultraviolet light curing of the photosensitive resin material in non-porous areas, a transparent rock-like specimen with a certain porosity and controllable mechanical properties is prepared. While ensuring high transparency, the present invention can adjust the mechanical properties of the transparent rock-like material by controlling the porosity, allowing it to simulate different rock materials. This method offers the advantages of high transparency and controllable mechanical properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0033] Figure 1 is a flow chart of a method according to an embodiment of the present invention;

[0034] Figure 2The target mechanical properties of the embodiments of the present invention are reference numerical fitting curves, wherein (a) is a reference numerical fitting curve of uniaxial compressive strength, (b) is a reference numerical fitting curve of elastic modulus, (c) is a reference numerical fitting curve of tensile strength, (d) is a reference numerical fitting curve of brittleness, (e) is a reference numerical fitting curve of cohesion, and (f) is a reference numerical fitting curve of internal friction angle;

[0035] Figure 3 Schematic diagram of cylinders with different porosities according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0038] Example 1

[0039] like Figure 1-2 As shown, this embodiment provides a method for preparing a transparent rock-like sample with controllable mechanical properties, comprising:

[0040] Obtain a transparent photosensitive resin solution and construct a transparent three-dimensional rock model based on its mechanical properties;

[0041] Importing the transparent rock three-dimensional model into a 3D printer to process the transparent photosensitive resin solution to obtain a solid model;

[0042] The solid model is polished after removing the supporting structure to obtain a transparent rock-like sample, specifically:

[0043] (1) Select transparent photosensitive resin solution: Use Gotha 8001 photosensitive resin from Zhongshan Dajian Technology Co., Ltd. as the base material, with a density of 1.12g / cm 3 (25℃), the appearance is close to colorless, transparent and viscous liquid, and it shows a curing depth of 0.08mm under the action of 355nm wavelength laser.

[0044] (2) Preparation of transparent rock three-dimensional model: According to the following formula, the porosity value n is set with the mechanical properties of uniaxial compressive strength (UCS), elastic modulus (E), tensile strength (TS), brittleness (B), cohesion (c), and internal friction angle (φ) as reference values.

[0045] UCS=-0.32*n+98.44;

[0046] E = -0.04*n+2.18;

[0047] TS = -0.24*n+8.56;

[0048] B = -0.22*n+12;

[0049] c = -0.48*n+14.67;

[0050] φ=-0.46*n+57.92;

[0051] The average porosity obtained by the above formula is used as the final porosity value. Using computer modeling technology, a three-dimensional model of transparent rock with circular pores and a porosity of n is established, and the STL file is output for subsequent printing.

[0052] (3) Printing transparent rock: The STL three-dimensional model file is imported into the Lite800 industrial-grade SLA 3D printer system. The model is digitally sliced ​​layer by layer through the 3D printing computer control system. The model is divided into thin slices with a thickness of 0.1mm. The contour information of each layer of the sample is obtained by layer scanning and stored in the computer. The 3D printer extracts the pore area and non-porous area according to the slice information for UV curing. The computer extracts data from the first layer, and the laser emits a UV laser beam and scans the surface of the liquid resin to complete the first layer of curing. After the first layer is cured, the workbench moves a layer thickness distance and performs the second layer of UV curing. Repeat until the solid model is printed layer by layer. During the printing process, only the non-porous area is cured by UV light, while the porous area is protected from UV light to achieve precise control, thereby ensuring that the resin material in the pores will not be cured and exists in liquid form to maintain the morphological characteristics of the pores.

[0053] (4) Model processing: Figure 3 As shown in the figure, after printing is completed, the support structure remaining on the surface during the printing process is removed, and finally a high-transparency rock-like sample is obtained through polishing.

[0054] The transparent rock is produced with a fast light curing rate, and the 3D production process can be completed in a short time. The surface of the material is smooth after molding, which saves manufacturing costs and time.

[0055] The transparent rock is made of photosensitive resin.

[0056] The porosity inside the transparent rock is controllable; the size of the pores inside the transparent rock is controllable; and the spatial distribution of the pores inside the natural rock is simulated.

[0057] The rock material is a transparent material that is resistant to high and low temperatures; the transparent rock is denatured under low temperature conditions; the material of the transparent rock is photosensitive resin; and the distribution form of natural rocks is simulated.

[0058] The rock-like sample has high strength and will not be damaged by human intervention during the polishing process, but its transparency can be improved by increasing the surface smoothness.

[0059] The computer software is a combination of PFC and UG.

[0060] The above are merely preferred embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A method for preparing a transparent rock sample with controllable mechanical properties, characterized in that: include: Obtain a transparent photosensitive resin solution and construct a transparent three-dimensional rock model based on its mechanical properties; Importing the transparent rock three-dimensional model into a 3D printer to process the transparent photosensitive resin solution to obtain a solid model; The solid model is polished after removing the supporting structure to obtain a transparent rock-like sample.

2. The method according to claim 1, characterized in that The properties of the transparent photosensitive resin solution include: density of 1.12 g / cm 3 The appearance is close to colorless, transparent and viscous liquid, and it shows a curing depth of 0.08mm under the action of 355nm wavelength laser.

3. The method according to claim 1, characterized in that The mechanical properties include: uniaxial compressive strength, elastic modulus, tensile strength, brittleness, cohesion and internal friction angle.

4. The method according to claim 3, characterized in that The calculation expression of the mechanical properties is: UCS=-0.32*n+98.44; E = -0.04*n+2.18; TS = -0.24*n+8.56; B = -0.22*n+12; c = -0.48*n+14.67; Among them, UCS is uniaxial compressive strength, E is elastic modulus, TS is tensile strength, B is brittleness, C is cohesion, is the internal friction angle, and n is the porosity.

5. The method according to claim 1, wherein The process of obtaining the entity model includes: Importing the transparent rock three-dimensional model into a 3D printer for printing; During the printing process, the 3D printer digitally slices the model layer by layer. The laser emits an ultraviolet laser beam to scan the surface of the liquid resin. After each layer is cured, the workbench moves a distance of the layer thickness to perform ultraviolet light curing on the next layer until the solid model is printed layer by layer.

6. The method according to claim 5, characterized in that During the process of digitally slicing the model, the thickness of the model slices is 0.1 mm.

7. The method according to claim 5, characterized in that The laser emits an ultraviolet laser beam, and in the process of scanning the surface of the liquid resin, only the non-porous area is cured by ultraviolet light, while the porous area is protected from ultraviolet light.

8. The method according to claim 1, characterized in that The process of obtaining the entity model further includes: The porosity value n is set according to the reference value of mechanical properties, and a three-dimensional model of a transparent rock with circular holes and a porosity of n is established using computer modeling technology, and an STL file is output; According to the output STL file, the STL three-dimensional model file is imported into the 3D printer system, and the model is digitally sliced ​​in layers through the 3D printing computer control system to obtain the contour information of each layer of the specimen.

9. An electronic device comprising a memory, a processor, and a computing program stored in the memory and executable on the processor, wherein: When the processor executes the computing program, the method according to any one of claims 1 to 8 is implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 8 is implemented.

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