Method for improving binding force of two-phase materials of pentamode metamaterial in additive manufacturing

A technology of metamaterials and binding force, applied in manufacturing tools, additive manufacturing, additive processing, etc., can solve the problems of increased design complexity and additive manufacturing difficulty, unsatisfactory acoustic effect control, and poor comprehensive mechanical properties , to simplify the preparation and design process, shorten the process and cycle, and achieve the effect of excellent mechanical properties

Active Publication Date: 2019-03-29
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] Due to the limitations of single-phase medium five-mode metamaterials due to the limitation of single material properties, it is difficult to exert its wave control effect, and it has poor adaptability to broadband in the low frequency band of acoustic waves. It is to add the second-phase non-metallic material to the metal-based five-mode metamaterial structure, and use the light weight of the non-metallic material to balance the overall density of the five-mode metamaterial, and at the same time homogenize the design dimensions of each part of the five-mode metamaterial It is convenient fo...

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  • Method for improving binding force of two-phase materials of pentamode metamaterial in additive manufacturing
  • Method for improving binding force of two-phase materials of pentamode metamaterial in additive manufacturing
  • Method for improving binding force of two-phase materials of pentamode metamaterial in additive manufacturing

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example 1

[0060] This is to use the present invention to manufacture Ti6Al4V-based five-mode metamaterial parts, adding a non-metallic rubber layer inside. The honeycomb structure has typical engineering applications in acoustic functional devices, such as medical stethoscopes, ultrasonic flaw detection, etc., and is also used in common applications in daily life, such as the sound insulation and noise reduction walls of KTV rooms. The preparation and forming of titanium alloy / nylon multi-material frame structure by laser selective melting technology and fusion deposition technology is taken as an example.

[0061] Ti6Al4V is a near-alpha titanium alloy, which is widely used in the fields of biomedicine and marine ships due to its ultra-high specific strength, excellent corrosion resistance and biocompatibility. In this example, the matrix adopts the evolution form of the honeycomb model, and the specific steps are as follows:

[0062] (1) Using Ti6Al4V alloy as the forming matrix mate...

example 2

[0069] Using the present invention to manufacture an AlSi10Mg-based five-mode metamaterial interface structure, the lower layer is an AlSi10Mg alloy, and the upper layer is a rubber material. The magnesium alloy / rubber multi-material frame structure is prepared and formed by laser selective melting technology and fusion deposition technology. The specific steps are as follows:

[0070] (1) AlSi10Mg is set as the forming matrix material, its elastic modulus E is 74.35GPa, and its density ρ is 2600kg / m 3 , establish the sawtooth interface structure as shown in the figure, the overall boundary height in the figure is H, the distance between the sawtooth is a, the non-sawtooth thickness is h, and figure 2 The metal phase is Ti6Al4V alloy, and the non-metal phase is rubber material.

[0071] (2) According to the established three-dimensional CAD model, export the STL file, and use the SLM process to manufacture the base structure;

[0072] (3) Manufacture of metal substrates by s...

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Abstract

The invention belongs to the field of pentamode metamaterial, and discloses a method for improving the binding force of two-phase materials of pentamode metamaterial in additive manufacturing. The method comprises the step (a) of regulating the size and wall thickness of hexagonal micro-units of the pentamode metamaterial, so that the actual density and modulus parameters of a honeycomb structureare approximate to set values, thereby obtaining a new size and wall thickness of the hexagonal micro-units; the step (b) of forming slots in interfaces between metallic phases and nonmetallic phasesat the connection position between the adjacent edges of each hexagonal micro-unit; the step (c) of calculating the sizes of the slots by making the compression wave velocity and shear wave velocity of eigen frequency in a curve equal to the set values; and the step (d) of establishing a three-dimensional structural model of the pentamode metamaterial, and forming and obtaining required pentamodemetamaterial parts through additive manufacturing. Through the method, the structural stability at the interface position between the metallic phases and the nonmetallic phases of the pentamode metamaterial is improved, and mechanical members of the pentamode metamaterial are improved; and strategies are provided for practical application of multiphase metamaterial in additive manufacturing.

Description

technical field [0001] The invention belongs to the field of five-mode metamaterials, and more specifically relates to a method for enhancing the bonding force of two-phase materials of five-mode metamaterials in additive manufacturing. Background technique [0002] Additive manufacturing technology is commonly known as 3D printing. Through software design and control system, special metal materials, non-metal materials and medical biomaterials are piled up layer by layer according to extrusion, sintering, melting, light curing, spraying, etc. to manufacture physical objects. manufacturing technology. Compared with the traditional subtractive or equal material mode of raw material removal-cutting and assembly, additive manufacturing is a "bottom-up" manufacturing method through material accumulation, from scratch. This makes it possible to manufacture complex structural parts that were restricted by traditional manufacturing methods in the past. [0003] Pentamode metamate...

Claims

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Application Information

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IPC IPC(8): B29C64/112B29C64/20B22F3/105B33Y10/00B33Y30/00
CPCB29C64/112B29C64/20B33Y10/00B33Y30/00B22F10/00B22F10/36B22F10/66B22F10/366B22F10/62B22F10/18B22F10/28Y02P10/25B22F12/00
Inventor 宋波张磊史玉升
Owner HUAZHONG UNIV OF SCI & TECH
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