3D printing transparent strain test piece for displaying hierarchical strain in real time

Abstract

The utility model relates to the technical field of mechanical test equipment and sensing, in particular to a 3D (three-dimensional) printing transparent strain test piece for displaying hierarchical strain in real time, which comprises a negative film structure, one side of the negative film structure is provided with an adhesive surface, and the other side of the negative film structure is provided with a detection structure. The detection structure comprises at least two test pieces, and the two ends of each test piece are fixedly connected with the negative film structure; each test piece comprises a middle detection part and a butt joint end part, the lengths of the plurality of test pieces are sequentially reduced from left to right, the plurality of test grid bars with different lengths are arranged on the negative plate, the test grid bars can be broken under the tensile action, the current tensile strain value is judged by observing the broken test grid bars, and the test accuracy is improved. Complex electronic equipment is not needed, a measured part is not shielded, and a strain value is directly reflected through a physical fracture state.

Description

Technical Field

[0001] This utility model relates to the field of mechanical testing equipment and sensing technology, specifically a 3D-printed transparent strain gauge for real-time display of hierarchical strain. Background Technology

[0002] Strain gauges, as important tools for testing mechanical properties, are widely used in civil engineering, machinery manufacturing, aerospace, and other fields. They are attached to the surface of an object to monitor its deformation under stress. Typical strain gauge technologies include resistance strain gauges and fiber optic strain gauges. Resistance strain gauges utilize the principle of the change in resistance of conductors or semiconductors during tension or compression, indirectly measuring the strain of materials or structures through the strain-resistance relationship. These strain gauges are simple in structure, low in manufacturing cost, and have high testing accuracy, but they are subject to high environmental requirements and require external equipment. Fiber optic strain gauges measure strain based on changes in light signals and are suitable for high-precision testing scenarios. They are resistant to electromagnetic interference, suitable for long-distance testing, and have good high-temperature resistance, but they are expensive to manufacture, complex to install, and highly dependent on specialized equipment.

[0003] While traditional strain gauges perform well in precise measurements, they suffer from several significant drawbacks in practical applications. Traditional strain gauges typically require complex electronic or optical instruments to acquire, process, and analyze signals. This not only increases testing costs but also limits their application in resource-constrained or remote areas. For example, in scenarios lacking power supply, strain testing cannot be performed normally. Existing testing technologies mostly present strain values ​​as digital signals, requiring specialized data processing software for analysis before the strain value can be displayed. This process is not only time-consuming but also requires the support of skilled technicians, making it difficult to meet the need for rapid assessment. Traditional strain gauges also struggle to function effectively in certain environments (such as magnetic fields or high humidity). Furthermore, existing strain gauge testing often involves obscuring the measured area, preventing simultaneous observation of the actual changes at that point.

[0004] Modern industry and engineering have placed greater demands on strain testing, especially in industrial field testing and large-scale applications. There is a need for a strain testing tool that allows workers to quickly determine the tensile stress state of a structure and is cost-effective.

[0005] Therefore, based on the above problems, this utility model proposes a novel transparent tensile strain test piece that can display hierarchical strain in real time and is manufactured using 3D printing technology. Utility Model Content

[0006] The purpose of this invention is to provide a 3D-printed transparent strain gauge for real-time display of hierarchical strain, in order to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A 3D-printed transparent strain gauge for real-time display of hierarchical strain includes a substrate structure. One side of the substrate structure is configured as an adhesive surface, and the other side of the substrate structure is configured with a detection structure. The detection structure includes at least two test pieces, each of which is fixedly connected to the substrate structure at both ends. Each test piece includes a central detection section and a mating end. The length of the central detection section of several test pieces decreases sequentially from left to right.

[0009] As a preferred embodiment of this utility model, the film structure and several test pieces are all made of transparent photosensitive resin material.

[0010] As a preferred embodiment of this utility model, a total of four test pieces are provided, with the central detection section using test grids and both ends of the test grids being fixedly connected to end caps.

[0011] As a preferred embodiment of this utility model, the outer diameter of the test grid bar is in the range of 1-3mm, and the length of the test grid bar is in the range of 5-10mm.

[0012] As a preferred embodiment of this utility model, the substrate structure includes a substrate, with protrusions fixedly connected to both ends of one side of the substrate, and the protrusions are fixedly connected to the ends of the test piece.

[0013] As a preferred embodiment of this utility model, the thickness of the film is 2mm.

[0014] As a preferred embodiment of this utility model, the other side of the film is an adhesive mating surface, which is adapted to the shape of the surface of the object being measured.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model sets several test grids of different lengths on the film, which can break under tension. The current tensile strain value can be determined by observing the broken test grids. It does not require complex electronic equipment, does not obstruct the test area, and directly reflects the strain value through the physical fracture state.

[0017] 2. This utility model is made by 3D printing, and the length and diameter of the test grid can be adjusted to achieve graded fracture under different strains, adapt to different testing needs, and is easy to manufacture and suitable for large-scale applications. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2This is the front view of the present invention;

[0020] Figure 3 This is a side view of the present invention;

[0021] Figure 4 This is a schematic diagram of the step-by-step fracture during the tensile process of this utility model.

[0022] In the diagram: film 1, raised strip 2, end 3, test grid 4. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0024] To facilitate understanding of this utility model, a more comprehensive description of it will be provided below with reference to relevant embodiments. Several embodiments of this utility model are given. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0025] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] Please see Figure 1-4 This utility model provides a technical solution:

[0028] For an example, please refer to... Figure 1 , 23 and 4, a 3D-printed transparent strain gauge for real-time display of hierarchical strain, comprising a substrate structure, one side of which is configured as an adhesive surface, and the other side of which is configured with a detection structure, the detection structure comprising at least two test pieces, each test piece having both ends fixedly connected to the substrate structure; the test pieces comprising a central detection section and a mating end, the length of the central detection section of several test pieces decreasing sequentially from left to right, the substrate structure and several test pieces being made of transparent photosensitive resin material.

[0029] Both the film structure and the test piece are made of transparent photosensitive resin material. The film structure is bonded to the object under test. When the object under test is stretched, the film structure and the test piece are also stretched. When the tensile force reaches the fracture threshold of the test piece, the test piece will break, thereby determining the stress condition of the structure. There are multiple test pieces to achieve graded detection and quickly determine the magnitude of the tensile force.

[0030] Please refer to Figure 1 , 2 There are four test pieces in total. The middle detection section uses test grid 4. Both ends of the test grid 4 are fixedly connected to end 3. The outer diameter of the test grid 4 is 1-3mm and the length of the test grid 4 is 5-10mm.

[0031] In this embodiment, the length of the test grid 4 decreases sequentially from left to right. The test grid 4 is labeled A, B, C, and D sequentially from right to left. The fracture threshold is that the test grids A, B, C, and D fracture at tensile strains of 0.01%, 1%, 2%, and 4%, respectively. That is, if the test grid A fractures, the tensile strain is 0.01%; if the test grids A and B fracture, the tensile strain is 1%. The tensile strain is inferred sequentially.

[0032] Figure 4 The test grid bar 4 was fractured under different tensile forces.

[0033] Please refer to Figure 1 , 2 3. The film structure includes a film 1. Both ends of one side of the film 1 are fixedly connected with protrusions 2. The protrusions 2 are fixedly connected to the end of the test piece. The thickness of the film 1 is 2mm. The other side of the film 1 is an adhesive mating surface, which is adapted to the surface shape of the object being tested.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A 3D-printed transparent strain gauge for real-time display of hierarchical strain, comprising a substrate structure, wherein one side of the substrate structure is configured as an adhesive surface, characterized in that: A detection structure is provided on the other side of the film structure. The detection structure includes at least two test pieces, and both ends of each test piece are fixedly connected to the film structure. The test piece includes a central detection section and a docking end, and the length of the central detection section of several test pieces decreases sequentially from left to right.

2. The 3D-printed transparent strain gauge for real-time display of hierarchical strain according to claim 1, characterized in that: The film structure and several test pieces are all made of transparent photosensitive resin material.

3. The 3D-printed transparent strain gauge for real-time display of hierarchical strain according to claim 2, characterized in that: There are four test pieces in total. The middle detection section uses a test grid (4), and both ends of the test grid (4) are fixedly connected to end pieces (3).

4. The 3D-printed transparent strain gauge for real-time display of hierarchical strain according to claim 3, characterized in that: The outer diameter of the test grid (4) is in the range of 1-3 mm, and the length of the test grid (4) is in the range of 5-10 mm.

5. The 3D-printed transparent strain gauge for real-time display of hierarchical strain according to any one of claims 1-4, characterized in that: The substrate structure includes a substrate (1), and both ends of one side of the substrate (1) are fixedly connected with protrusions (2), which are fixedly connected to the ends of the test piece.

6. The 3D-printed transparent strain gauge for real-time display of hierarchical strain according to claim 5, characterized in that: The thickness of the film (1) is 2 mm.

7. The 3D-printed transparent strain gauge for real-time display of hierarchical strain according to claim 6, characterized in that: The other side of the film (1) is the adhesive mating surface, which is adapted to the shape of the surface of the object being measured.

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