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Three-dimensional negative stiffness honeycomb structure and preparation method thereof

A honeycomb structure, negative stiffness technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of limiting the recoverability of the honeycomb structure, limiting the energy absorption, limiting the reuse of the honeycomb structure, etc. Sexual energy absorption, energy absorption enhancement, effect with initial stiffness

Active Publication Date: 2017-07-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention aims at absorbing energy through plastic deformation of the existing ordinary honeycomb structure, which limits the energy absorption; and limits the recoverability of the ordinary honeycomb structure; also limits the problem of repeated use of the honeycomb structure

Method used

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  • Three-dimensional negative stiffness honeycomb structure and preparation method thereof
  • Three-dimensional negative stiffness honeycomb structure and preparation method thereof
  • Three-dimensional negative stiffness honeycomb structure and preparation method thereof

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Experimental program
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specific Embodiment approach 1

[0031] Specific implementation mode one: combine Figures 1 to 4 Describe this embodiment, the three-dimensional negative stiffness honeycomb structure of this embodiment, it is interlocked together by four inserts 1, has formed three-dimensional negative stiffness honeycomb structure; The four inserts 1 all have interlocking notches 3. The width of each interlocking notch 3 is equal to the thickness of the insert 1, and the thickness of the four inserts 1 is the same; two of the four inserts 1 are defined as column groups, and the other two are defined as row groups. The interlocking notch 3 of the group and the interlocking notch 3 of the row group are embedded together to form a three-dimensional negative stiffness honeycomb structure;

[0032] The insert 1 is composed of five hollow "hexagonal" units 1-1, an upper beam 1-2 and a lower beam 1-3;

[0033] Wherein, the left and right sides of each "hexagonal" unit 1-1 are parallel to the vertical line;

[0034] One side of ...

specific Embodiment approach 2

[0040] Specific implementation mode two: combination Figures 1 to 4 This embodiment is described. The difference between this embodiment and the specific embodiment 1 is that the "hexagonal" unit 1-1 is grooved on the upper and lower sides. Other compositions and connection methods are the same as those in Embodiment 1.

specific Embodiment approach 3

[0041] Specific implementation mode three: combination Figures 1 to 4 Describe this embodiment, the difference between this embodiment and specific embodiment 1 is: the upper and lower four sides of the "hexagonal" unit 1-1 are "wave-shaped", and the upper parts of the upper two sides are convex arc-shaped sides , the lower part is a concave arc-shaped side, and the lower two sides and the upper two sides are arranged symmetrically with the transverse axis of the "hexagonal" unit 1-1.

[0042] Other compositions and connection methods are the same as those in Embodiment 1.

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Abstract

The invention discloses a three-dimensional negative stiffness honeycomb structure and a preparation method thereof and relates to the negative stiffness honeycomb structure and the preparation method thereof. According to the structure and the method, the problem that an existing general honeycomb structure absorbs energy through plastic deformation, so the energy absorption is limited and the reuse of the honeycomb structure is also limited by the irrecoverability of the general honeycomb structure is solved. According to the structure provided by the invention, insertion pieces are prepared in a mode of 3D printing preparation or a cutting board; slots are arranged on the insertion pieces; the insertion pieces are embedded and locked together through the slots; and brazing is carried out, thereby preparing the three-dimensional negative stiffness honeycomb structure finally. The structure provided by the invention has high initial stiffness and high recoverable energy absorption. The structure and the method are applied to the field of aerospace.

Description

technical field [0001] The invention relates to the design of a negative stiffness honeycomb structure and a preparation method thereof, in particular to the design of a three-dimensional negative stiffness honeycomb structure and a preparation method thereof. Background technique [0002] With the rapid development of engineering technologies such as aerospace technology, the demand for lightweight, energy-absorbing structures is more urgent. Compared to other low-density materials, such as random foams, honeycombs offer very high levels of compressive strength and energy absorption, characteristics that are directly related to cell shape and density. [0003] The stress-strain curve of the honeycomb structure can illustrate its high energy absorption. Honeycombs composed of elastoplastic materials typically exhibit a linear elastic region, and in-plane compression of the cell walls of the honeycomb exhibits bending or axial compression. When the critical pressure is exce...

Claims

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Application Information

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IPC IPC(8): G06F17/50B23P15/00
CPCB23P15/00G06F30/15G06F30/23
Inventor 王兵李渊马力胡记强吴林志
Owner HARBIN INST OF TECH
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