RU182601U1 - FASTENING ELEMENT FOR CONNECTING PARTS FROM LAMINATED POLYMER COMPOSITE MATERIALS BASED ON GLASS FABRIC AND MATRIX FROM SYNTHETIC RESIN WITH METAL PARTS OF THE DESIGN - Google Patents

Abstract

The utility model relates to the field of mechanical engineering and can be used to connect parts from layered (laminate) polymer composite materials (based on fiberglass and synthetic resin matrices) with metal parts of structures, without violating the integrity of the fibers of the base of the composite material. The fastener is a cylindrical pin, passing from one end into a spear-shaped ending, consisting of expanding (thickened) and tapering (pointed) parts, the expanding (thickened) part adjoins the cylindrical part of the fastening element. The fastening element has a transition from the expanding (thickened) part to the tapering part of the spear-shaped ending, decorated with a radius. The internal angles between the plate of the expanding part of the spear-shaped tip and its thickened edges are made on the basis of the radius transition.

The proposed fastener when it is torn from the body of the part allows you to: minimize the sliding of the polymer composite material along the surface of the thickened part of the spear-shaped ending; reduce the irregular zone of the composite material with the predominance of synthetic resin in the places where the ending of the ending plate is in the thickened part; to reduce the probability of violating the integrity of the fibers of the base of the composite material and the occurrence of microcracks in the matrix under vibration loads; simplify the manufacturing technology of the fastener.

Description

The utility model relates to the field of mechanical engineering and can be used to connect parts from layered (laminate) polymer composite materials (based on fiberglass and synthetic resin matrices) with metal parts of structures, without violating the integrity of the fibers of the base of the composite material.

Known fastener, an element for connecting parts from layered polymer composite materials based on fiberglass and synthetic resin matrices with metal parts of the structure [1], which is made in the form of a metal cylindrical pin (needle). The disadvantage of this technical solution is the sliding of the polymer composite material from the fastener when it is torn from the body of the part. The strength of such a compound is not high enough and is determined mainly by the adhesive component.

Known fasteners for connecting parts from layered polymer composite materials based on fiberglass and synthetic resin matrices with metal parts of the structure [2], which are made in the form of metal rods with various tips: needle, triangular lamellar and spade-like lamellar. The disadvantages of these technical solutions are: the sliding of the polymer composite material from the fastener when it is torn from the body of the part; the presence of thread on the rod; stratification of the composite material when the fastener is torn out. The strength of such a compound is not high enough and is determined mainly by the adhesive component. A thread is cut on the metal rod of the fasteners (for fastening in the slots of the metal plates), which increases the complexity of manufacturing the fastener.

The closest to the utility model in terms of technical nature and the effect achieved is a fastener for connecting parts of layered polymer composite materials based on fiberglass and synthetic resin matrices with metal parts of the structure [3], which is made in the form of a cylindrical pin with a tip of a spade shape with thickened shoulders. The disadvantages of this technical solution are: the formation of a significant irregular zone of the composite material with a predominance of synthetic resin in the places of the internal transition from the plate to the thickened edges of the expanding part of the tip; the presence of acute angles during the transition from the expanding (thickened) part to the tapering part of the shovel-shaped tip, which are stress concentrators, which causes the initiation of microcracks in the matrix and the violation of the fibers of the base of the composite material, reduces the strength of the connection, complicates the manufacturing technology of the fastener.

The objective of the utility model is to increase the bond strength and simplify the manufacturing technology of the fastener.

The problem is achieved in that: the transition from the expanding (thickened) part to the tapering part of the spear-shaped ending is framed by a radius; the internal angles between the plate of the expanding part of the spear-shaped tip and its thickened edges are made on the basis of the radius transition; the rest of the fastener is made in the form of a cylindrical pin.

In FIG. 1 shows a fastener;

In FIG. 2 shows a section AA of FIG. one.

In FIG. 3 shows a section BB of FIG. one.

The fastener for connecting parts from layered polymeric composite materials based on fiberglass and synthetic resin matrices with metal parts of the structure is a cylindrical pin, passing from one end to a spear-shaped ending, consisting of expanding (thickened) and tapering (pointed) parts, expanding ( thickened) part adjoins the cylindrical part of the fastener. The transition from the expanding (thickened) part to the tapering part of the spear-shaped tip is decorated with a radius R. The internal angles between the plate of the expanding part of the spear-shaped tip and its thickened edges are based on the radius transition r.

The application of the proposed technical solution allows: to reduce the sliding of the polymer composite material when the fastener is torn out due to the thickened part; to reduce the irregular zone of the composite material with the predominance of synthetic resin in the places where the ending plate transitions to the expanding (thickened) part; to reduce the likelihood of violating the integrity of the fibers of the base of the composite material and the occurrence of microcracks in the matrix under vibration loads at the points of transition from the expanding (thickened) part to the tapering part of the spear-shaped ending. An increase in the bond strength is achieved by increasing the contact area of the fastener body with the composite material in the area of the thickened part of the spear-shaped ending and is determined not only by the adhesive component, but also by the flexibility of the composite material. The complexity of manufacturing is reduced due to the exclusion of operations associated with threading on the cylindrical part of the fastener.

The application of the proposed technical solution allows to simplify the manufacturing technology of the fastener.

The technical result of this solution is to reduce the likelihood of violating the integrity of the fibers of the base of the composite material and the occurrence of microcracks in the matrix under vibration loads at the points of transition from the expanding part to the tapering part of the spear-shaped tip.

Information sources

1. B2 8455074 US. Metal / composite joint with selective interlaminar reinforcement / Steven P. Wanthal / The Boeing Company. No. 019910/12. Filed. 01/25/2008.

2. Astakhov, M.B. An experimental study of the strength of the steel-composite joints / M.V. Astakhov, T.V. Tagantsev // Proceedings of MSTU "Mathematical modeling of complex technical systems." - M ,: Publishing House - at the MSTU. N.E. Bauman, 2006. - No. 593. - S. 125-130

3. Sorokina, I.I. Investigation of the influence of the shape of the fastener on the strength of the metal-composite joint [Electronic resource] / II. Sorokina, M.V. Astakhov // Science and Education: Electronic Scientific and Technical Edition. - 2012. - No. 02. URL: http://techhomag.edu.ru/doc/308514.html. (accessed September 30, 2014).

Claims (2)

1. A fastener for connecting parts from layered polymer composite materials based on fiberglass and synthetic resin matrices with metal parts of the structure, characterized in that it is made in the form of a cylindrical pin passing from one end to a spear-shaped ending for connecting layered polymer composite materials to based on fiberglass and synthetic resin matrices with metal parts of structures, without violating the integrity of the fibers of the composite base, characterized in that the transition from the expanding part to the tapering part of the spear-shaped tip is framed with a radius. 2. A fastener for joining parts of layered polymer composite materials based on fiberglass and synthetic resin matrices with metal parts of a structure according to claim 1, characterized in that the internal angles between the plate of the expanding part of the spear-shaped tip and its thickened edges are made on the basis of the radius transition .

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