A Negative Poisson's Ratio Structure Based on Flexible Hinges

A flexible hinge, negative Poisson's ratio technology, applied in building components, shock absorbers, shockproof and other directions, can solve problems such as reducing stress concentration at acute angles, and achieve the effect of improving designability, solving failures, and ensuring stability

Active Publication Date: 2022-02-08
NAT INNOVATION INST OF DEFENSE TECH PLA ACAD OF MILITARY SCI
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to address the defects in the prior art and provide a negative Poisson’s ratio structure based on flexible hinges. Flexible hinges are installed at sharp corners inside the structure to reduce stress concentration at sharp corners and increase adjustment The means of changing the overall stiffness of the structure by the parameters of the flexible hinge solves the problem of interference between the two rods corresponding to the connection of the flexible hinge after deformation

Method used

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  • A Negative Poisson's Ratio Structure Based on Flexible Hinges
  • A Negative Poisson's Ratio Structure Based on Flexible Hinges
  • A Negative Poisson's Ratio Structure Based on Flexible Hinges

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Embodiment 1

[0037] In a typical implementation of the present disclosure, such as Figure 1-Figure 8 As shown, a flexible hinge-based negative Poisson's ratio structure is proposed.

[0038] For the negative Poisson's ratio structure mentioned in the background technology, combined with the attached Figure 4-Figure 5 ,for Figure 4 In the structure in , when the connecting rod at the bottom receives a vertical downward force, the rods on both sides of the acute angle structure point will move accordingly, so that the angle between the structure points will increase and the adjacent rods will expand; When the distance between the upper and lower connecting rods is greater, under the action of the structure point, the distance between the left and right sides will also be greater, forming a negative Poisson's ratio structure and satisfying the negative Poisson's ratio characteristic;

[0039] Similarly, when the connecting rods located on the left and right sides are subjected to force, ...

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Abstract

The present disclosure provides a flexible hinge-based negative Poisson's ratio structure, which relates to the field of negative Poisson's ratio structures, and includes multiple structural units arranged in arrays, each structural unit includes multiple structural modules, and each structural module includes two one end of the two rods is connected by a flexible hinge to form a node, and the other end is connected to the non-node end of other structural module rods to form an intersection point, and at least three structural modules cooperate to form a polygonal star-shaped structural unit with an acute angle at the node, The intersection points of adjacent structural units are connected by connecting rods, and flexible hinges are set at sharp corners inside the structure to reduce stress concentration at acute corners, and a means of adjusting the parameters of the flexible hinges to change the overall stiffness of the structure is added to solve the two problems of the corresponding connection of the flexible hinges. The interference problem of a rod after deformation.

Description

technical field [0001] The present disclosure relates to the field of negative Poisson's ratio structures, in particular to a flexible hinge-based negative Poisson's ratio structure. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Poisson's ratio is a measure of the Poisson effect, the tendency of a material to expand in a direction perpendicular to the direction of compression. Conversely, if a material is stretched rather than compressed, it generally tends to shrink in the transverse direction of the stretching direction; the negative Poisson's ratio property is the opposite of the Poisson's ratio property, which means that when stretched, the material is in the elastic range Expansion occurs in the inner transverse direction; when compressed, the transverse direction of the material shrinks instead. [0004] The inventors found tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04B1/98E04H9/02F16F7/00
CPCE04B1/98E04H9/021F16F7/00
Inventor 王荣陈永雄张志彬孔令超王浩旭王鑫
Owner NAT INNOVATION INST OF DEFENSE TECH PLA ACAD OF MILITARY SCI
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