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

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...

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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 for additive manufacturing and processing; but on the one hand, there is poor stability at the interface between the micro-unit cell metal and non-metallic materials of the two-phase five-mode metamaterial lattice structure, and it is easy to receive interference from fluctuating energy, causing the second phase medium to slip, The phenomenon of looseness leads to unsatisfactory acoustic effect control and poor comprehensive mechanical properties; The design problem becomes a multi-phase five-mode metamaterial design, which increases the complexity of the design and the difficulty of additive manufacturing

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