Piezoelectric composite metamaterial with three-dimensional pressure-torsion coupling negative poisson ratio structure substrate

Abstract

The invention discloses a piezoelectric composite metamaterial with a three-dimensional pressure-torsion coupling negative Poisson's ratio structure substrate, the electromechanical coupling performance of a piezoelectric material is improved by using the interference of the three-dimensional negative Poisson's ratio structure substrate on the deformation behavior of the piezoelectric material, and the piezoelectric composite metamaterial comprises a stainless steel substrate, an insulating epoxy resin layer and piezoelectric ceramics; wherein the stainless steel substrate is prepared by combining the characteristics of a planar negative Poisson's ratio perforated plate structure and a three-dimensional pressure-torsion coupling negative Poisson's ratio structure; and the piezoelectric ceramics connected in series are adhered to the upper and lower surfaces of the stainless steel substrate through the epoxy resin layer. According to the piezoelectric composite metamaterial provided by the invention, the energy conversion performance of a piezoelectric device can be remarkably improved, and manufacturing of a piezoelectric energy collection device with higher electric power output and a more sensitive piezoelectric sensing device is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy materials and devices, and in particular to a piezoelectric composite metamaterial having a three-dimensional compression-torsion coupling negative Poisson's ratio structural substrate. Background Art

[0002] With the rapid development of new materials and electronic integration technology, more and more electronic products are integrated into people's daily work and life. However, electronic devices are mainly powered by chemical batteries, which have a limited service life and cause environmental pollution. Therefore, energy harvesting technology that collects energy from the environment to replace traditional batteries or extend the life of traditional batteries has attracted widespread attention from industry and academia. Among them, piezoelectric energy harvesting technology has always occupied an important position in the field of mechanical energy harvesting due to its many advantages such as low power consumption, no electromagnetic interference, and easy processing. However, its disadvantages of low electromechanical coupling coefficient and poor reliability also limit the further application of piezoelectric energy harvesting technology.

[0003] Negative Poisson's ratio metamaterials, due to their unique deformation characteristics under load, can simultaneously stimulate multiple electromechanical coupling modes of piezoelectric ceramics to perform energy conversion after being combined with piezoelectric ceramics, thereby improving the electrical power output of piezoelectric elements. The principle is: by adding a negative Poisson's ratio substrate to interfere with the deformation mode of the piezoelectric material, the piezoelectric composite metamaterial exhibits negative Poisson's ratio characteristics under load. Since Smith proposed the advantages of the negative Poisson's ratio effect in improving the electrical power output of piezoelectric materials in 1991, research results on negative Poisson's ratio piezoelectric composite metamaterials have received increasing attention, and a large number of studies have proved the application value of negative Poisson's ratio piezoelectric composite metamaterials in energy harvesting. However, existing related research mainly focuses on the application of negative Poisson's ratio piezoelectric composite metamaterials in d 31 performance in working mode, ignoring the 33 The performance in working mode, and the latter plays an important role in the fields of road piezoelectric energy harvesting, human body energy harvesting, etc. How to optimize the structural design of negative Poisson's ratio piezoelectric composite metamaterials so that it can better solve the pain points in practical applications is one of the focuses of research at this stage. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the existing negative Poisson's ratio piezoelectric composite metamaterial lacks the 33 The performance advantage in the working mode and the problem of limited application environment are solved by introducing the characteristics of three-dimensional compression-torsion coupling structure into the design of negative Poisson's ratio substrate. 33 In this working mode, all electromechanical coupling modes of piezoelectric ceramics were simultaneously excited for the first time, realizing the negative Poisson's ratio piezoelectric composite metamaterial in d 33The improved performance in working mode enables piezoelectric composite metamaterials to have richer application scenarios.

[0005] The technical solution adopted by the present invention is: a piezoelectric composite metamaterial with a three-dimensional compression-torsion coupling negative Poisson's ratio structure substrate, comprising a stainless steel substrate, an insulating epoxy resin layer and a piezoelectric ceramic;

[0006] The stainless steel substrate is composed of a plane negative Poisson's ratio perforated plate structure and a three-dimensional compression-torsion coupled negative Poisson's ratio structure;

[0007] The stainless steel substrate combines the characteristics of a planar negative Poisson's ratio perforated plate structure and a three-dimensional compression-torsion coupled negative Poisson's ratio structure. 31 In the working mode, the planar negative Poisson's ratio perforated plate structure of the stainless steel substrate plays a major role, simultaneously exciting the 31 and 32 electromechanical coupling modes of the piezoelectric ceramics under load, thereby improving the electrical power output of the piezoelectric composite metamaterial; 33 In the working mode, the planar negative Poisson's ratio perforated plate structure of the stainless steel substrate and the three-dimensional compression-torsion coupled negative Poisson's ratio structure work together to simultaneously stimulate the 31, 32 and 33 electromechanical coupling modes of the piezoelectric ceramics, maximizing the electrical power output of the piezoelectric composite metamaterial.

[0008] The stainless steel substrate and the piezoelectric ceramic are bonded via an insulating epoxy resin layer.

[0009] Preferably, the opening angle of the plane negative Poisson's ratio perforated plate portion of the stainless steel substrate satisfies: θ = 5°, thereby ensuring that the piezoelectric composite metamaterial is 31 The electrical power output in working mode is maximized.

[0010] Preferably, the ratio of the width of the connection of the planar negative Poisson's ratio perforated plate portion of the stainless steel substrate to the total width of the metamaterial satisfies: d / W≈0.075.

[0011] Preferably, the angle of the inclined rod of the three-dimensional compression-torsion coupling negative Poisson's ratio part of the stainless steel substrate satisfies: 15°≤α≤20°, thereby ensuring that the piezoelectric composite metamaterial is 33 The electrical power output in working mode is maximized.

[0012] Preferably, the thickness of the insulating epoxy resin layer satisfies: h=10 μm.

[0013] The above-mentioned piezoelectric composite metamaterial having a three-dimensional compression-torsion coupling negative Poisson's ratio structure substrate comprises the following steps:

[0014] 1) Determine the length L, width W, and thickness H of the piezoelectric ceramic according to the actual application of the metamaterial;

[0015] 2) Design the structural dimensions of the stainless steel substrate based on different piezoelectric ceramic sizes, including substrate thickness, tilt rod cross-sectional dimensions, etc.;

[0016] 3) connecting the piezoelectric ceramic and the stainless steel substrate through an insulating epoxy resin layer to form a complete piezoelectric composite metamaterial;

[0017] 4) The piezoelectric composite metamaterial manufactured by this method can simultaneously excite multiple electromechanical coupling modes of the piezoelectric ceramic under the action of external loads, thereby obtaining a higher electromechanical coupling coefficient.

[0018] The invention discloses an application of a novel piezoelectric composite metamaterial having a three-dimensional compression-torsion coupling negative Poisson's ratio structural substrate in piezoelectric energy collection elements and piezoelectric sensors.

[0019] Beneficial effects of the present invention:

[0020] The present invention provides a piezoelectric composite metamaterial with a three-dimensional compression-torsion coupled negative Poisson's ratio structural substrate, which adopts a stainless steel substrate that combines a planar negative Poisson's ratio perforated plate structure with a three-dimensional compression-torsion coupled negative Poisson's ratio structure. The electromechanical coupling coefficient of the piezoelectric composite metamaterial is greatly improved by the interference of the substrate on the deformation behavior of piezoelectric ceramics. The piezoelectric composite metamaterial proposed by the present invention can significantly improve the energy conversion performance of piezoelectric devices, and is helpful for manufacturing piezoelectric energy harvesting devices with higher electrical power output, as well as more sensitive piezoelectric sensor devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of a piezoelectric composite metamaterial with a three-dimensional compression-torsion coupled negative Poisson's ratio structural substrate;

[0022] Figure 2 for Figure 1 The structural breakdown diagram of

[0023] Figure 3 The top view of the planar negative Poisson's ratio perforated plate section of the stainless steel substrate;

[0024] Figure 4 Schematic diagram of some relevant structural parameters of the plane negative Poisson's ratio perforated plate on stainless steel substrate;

[0025] Figure 5 Schematic diagram of some relevant structural parameters of the three-dimensional compression-torsion coupling negative Poisson's ratio of the stainless steel substrate;

[0026] Figure 6 Schematic diagram of the insulating epoxy resin layer in the piezoelectric composite metamaterial;

[0027] Figure 7 The electrical connection method of the piezoelectric ceramics in the piezoelectric composite metamaterial and the circuit of the external load resistor;

[0028] Figure 8 This is a comparison chart of the output voltage of piezoelectric composite metamaterials and traditional piezoelectric composite materials under the same load. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with specific embodiments and accompanying drawings:

[0030] like Figure 1 and 2 As shown, a piezoelectric composite metamaterial 1 having a three-dimensional compression-torsion coupling negative Poisson's ratio structural substrate is composed of three parts: a stainless steel substrate 2, an insulating epoxy resin layer 3 and a piezoelectric ceramic 4;

[0031] The stainless steel substrate 2 is composed of a planar negative Poisson's ratio perforated plate structure and a three-dimensional compression-torsion coupled negative Poisson's ratio structure;

[0032] The opening angle of the plane negative Poisson's ratio perforated plate portion of the stainless steel substrate 2 satisfies: θ = 5° (e.g. Figure 3 and 4 shown);

[0033] The ratio of the width of the connection of the plane negative Poisson's ratio perforated plate portion of the stainless steel substrate 2 to the total width of the metamaterial satisfies: d / W≈0.075 (e.g. Figure 3 and 4 shown);

[0034] The tilt rod angle of the three-dimensional compression-torsion coupling negative Poisson's ratio portion of the stainless steel substrate 2 satisfies: 15°≤α≤20° (e.g. Figure 5 shown).

[0035] The stainless steel substrate 2 and the piezoelectric ceramic 4 are bonded together by an insulating epoxy resin layer 3, and the thickness of the insulating epoxy resin layer 3 satisfies: h = 10 μm (e.g. Figure 6 shown).

[0036] The piezoelectric ceramics are connected in series and bonded to the upper and lower surfaces of the stainless steel substrate through an insulating epoxy resin layer. They are also connected to an external load resistor to form a closed circuit (such as Figure 7 shown).

[0037] Figure 8 Comparison of the output voltage of piezoelectric composite metamaterial (right) and traditional piezoelectric composite material (left) under the same load.

[0038] The above-mentioned piezoelectric composite metamaterial having a three-dimensional compression-torsion coupling negative Poisson's ratio structure substrate comprises the following steps:

[0039] 1) Determine the length L, width W, and thickness H of the piezoelectric ceramic according to the actual application of the metamaterial;

[0040] 2) Design the structural dimensions of the stainless steel substrate based on different piezoelectric ceramic sizes, including substrate thickness, tilt rod cross-sectional dimensions, etc.;

[0041] 3) connecting the piezoelectric ceramic and the stainless steel substrate through an insulating epoxy resin layer to form a complete piezoelectric composite metamaterial;

[0042] 4) The piezoelectric composite metamaterial manufactured by this method can simultaneously excite multiple electromechanical coupling modes of the piezoelectric ceramic under the action of external loads, thereby obtaining a higher electromechanical coupling coefficient.

[0043] It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. All components not specified in this example can be implemented using existing technologies.

Claims

1. A piezoelectric composite metamaterial having a three-dimensional compression-torsion coupled negative Poisson's ratio structural substrate, characterized in that: It includes a stainless steel substrate, an insulating epoxy resin layer and piezoelectric ceramics; The stainless steel substrate is composed of a plane negative Poisson's ratio perforated plate structure and a three-dimensional compression-torsion coupled negative Poisson's ratio structure; The stainless steel substrate and the piezoelectric ceramic are bonded via an insulating epoxy resin layer.

2. The novel piezoelectric composite metamaterial with a three-dimensional compression-torsion coupling negative Poisson's ratio structure substrate according to claim 1 is characterized in that: The opening angle of the plane negative Poisson's ratio perforated plate portion of the stainless steel substrate satisfies: θ=5°.

3. The novel piezoelectric composite metamaterial with a three-dimensional compression-torsion coupling negative Poisson's ratio structure substrate according to claim 2 is characterized in that: The ratio of the width of the connection of the plane negative Poisson's ratio perforated plate part of the stainless steel substrate to the total width of the metamaterial satisfies: d / W≈0.

075.

4. The novel piezoelectric composite metamaterial with a three-dimensional compression-torsion coupling negative Poisson's ratio structure substrate according to claim 3 is characterized in that: The angle of the inclined rod of the three-dimensional compression-torsion coupling negative Poisson's ratio part of the stainless steel substrate satisfies: 15°≤α≤20°.

5. The novel piezoelectric composite metamaterial with a three-dimensional compression-torsion coupling negative Poisson's ratio structure substrate according to claim 4, characterized in that: The thickness of the insulating epoxy resin layer satisfies: h=10 μm.

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