CN114083839A

CN114083839A - Sandwich structure with rubber inserted layer punches

Info

Publication number: CN114083839A
Application number: CN202111472834.9A
Authority: CN
Inventors: 康鲁迪; 刘碧龙; 孙成溥; 李新; 安峰岩
Original assignee: Qingdao University of Technology
Current assignee: Qingdao University of Technology
Priority date: 2021-12-03
Filing date: 2021-12-03
Publication date: 2022-02-25

Abstract

The invention provides a sandwich structure with a perforated rubber insert layer, which comprises an upper panel, a lower panel, a light thick core layer and the perforated rubber insert layer. The sandwich structure solves the problem of poor acoustic performance of the traditional sandwich structure, has a simple structure, high static and low dynamic properties and excellent acoustic performance, obviously improves the acoustic performance of the sandwich structure, and improves the sound insulation performance.

Description

Sandwich structure with rubber inserted layer punches

Technical Field

The invention belongs to the field of multilayer materials, and particularly relates to a sandwich structure with a perforated rubber insertion layer.

Background

The light sandwich structure has the characteristics of light weight, high specific strength, high specific rigidity, impact resistance and the like, and is widely applied to the fields of packaging engineering, skin and the like. The sandwich structure is formed by bonding two skin panels with high strength and rigidity and a core material which is sandwiched between the two skin panels and has light weight and high thickness. The sandwich structure of the honeycomb plate is positioned between the honeycomb plate and the sandwich structure, but when the strength requirement is higher, the rigidity of the sandwich structure must be improved by increasing the thickness of the honeycomb, namely increasing the volume. The volume is increased, the weight is increased, the transportation is not facilitated, and the noise greatly affects the attention of a driver and the comfort of passengers when the machine works; the noise can radiate outwards through the structure, and the production and living environment of residents is affected. The requirements for the acoustic properties of sandwich structures are increasing.

Disclosure of Invention

In order to solve the problem of poor acoustic performance of the traditional sandwich structure, the sandwich structure which is simple in structure, high in static rigidity, low in dynamic rigidity and excellent in acoustic performance is provided, the acoustic performance of the sandwich structure can be obviously improved, and the sound insulation performance is improved.

In some embodiments of the present application, a sandwich structure having a perforated rubber insert layer includes an upper panel, a lower panel, a lightweight thick core layer, and a perforated rubber insert layer.

In some embodiments of the present application, the sandwich structure is, in order from top to bottom, an upper panel, a foam core, a perforated rubber layer, a foam core, and a lower panel.

In some embodiments of the present application, the thickness of the rubber layer is 2mm to 6mm, the aperture is 20 mm to 30mm, and the area of the holes is 40% to 60% of the total area.

In some embodiments of the present application, the shape of the hole is not limited to a circular hole, a long hole, a square hole, a trapezoidal hole.

Compared with the traditional sandwich structure, the applicant finds that the apparent bending rigidity curve is more rapidly attenuated along with the increase of frequency by introducing the perforated rubber layer with lower specific modulus in the middle of the sandwich structure, the perforated rubber layer shows more excellent mechanical characteristics of high static and low dynamic, and the sound insulation performance is obviously improved.

By introducing a perforated rubber layer with a lower specific modulus, the shear modulus of the core layer is greatly reduced, which is beneficial to reducing the acoustic radiation of the sandwich structure and does not affect the static rigidity of the whole structure.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic view of a sandwich structure with a perforated rubber insert layer in an embodiment of the present application.

1-upper panel, 2-foam core, 3-perforated rubber layer, 4-foam core, 5-lower panel.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Referring to fig. 1, the sandwich structure is composed of an upper panel, a lower panel, two light thick core layers and a perforated rubber insert layer. Compared with a typical sandwich core plate, the sandwich core plate has the advantages that the apparent bending rigidity curve is more rapidly attenuated along with the increase of frequency, mechanical characteristics of higher static and lower dynamic are shown, and the sound insulation performance is further remarkably improved.

The sandwich structure comprises an upper panel, a foam core, a perforated rubber layer, a foam core and a lower panel from top to bottom in sequence.

The thickness of the rubber layer is 2-6 mm, the aperture is 20-30 mm, and the punching area accounts for 40-60% of the total area.

A perforated rubber layer with lower specific modulus is introduced into the middle of a sandwich layer of the sandwich structure, the apparent bending stiffness curve of the perforated rubber layer is more rapidly attenuated along with the increase of frequency, the perforated rubber layer shows more excellent mechanical characteristics of high static and low dynamic, and the sound insulation performance is obviously improved.

By introducing a perforated rubber layer with a lower specific modulus, the shear modulus of the core layer is greatly reduced, which is beneficial to reducing acoustic radiation and does not affect the static stiffness of the overall structure.

The punching can be performed by adopting a traditional punching mode.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims

1. A sandwich structure with a perforated rubber insert, characterized in that the sandwich structure comprises an upper panel, a lower panel, a light thick core layer and a perforated rubber insert.

2. The sandwich structure with perforated rubber insert of claim 1 wherein said sandwich structure is, in order from top to bottom, an upper panel, a foam core, a perforated rubber layer, a foam core and a lower panel.

3. The sandwich structure with a perforated rubber insert according to claim 1 wherein said perforated rubber layer has a thickness of 2mm to 6 mm.

4. The sandwich structure with the perforated rubber insert layer according to claim 1, wherein the holes in the perforated rubber insert layer are uniformly distributed, and the diameter of the holes is 20-30 mm.

5. The sandwich structure with perforated rubber insert of claim 1 wherein the perforated rubber insert has a perforated area of 40% to 60% of the total area.

6. The sandwich structure with perforated rubber insert layer according to claim 1, wherein said holes are in the shape of circular holes, elongated holes, square holes, trapezoidal holes.