Triangular-section arc-shaped composite truss and preparation method thereof

Abstract

The invention discloses a triangular-section arc-shaped composite truss which is of an arc-shaped three-dimensional structure formed by connecting an outer chord member, a first inner chord member and a second inner chord member which are parallel to one another through a triangular-section web member assembly. A first outer diagonal web member, a second outer diagonal web member and an inner diagonal web member are diagonally arranged on the outer chord member, the first inner chord member and the second inner chord member between the adjacent triangular section web member assemblies respectively and are fixedly connected with the four-way joint, and each member is made of a carbon fiber composite material; the invention further discloses a preparation method of the triangular-section arc-shaped composite material truss. The large-radian composite material truss structure with the curvature is formed by connecting the web member assemblies with the triangular sections, the size precision is high, the loading performance is good, the truss structure achieves ultra-light weight, and modular connection of large composite material pipe trusses is achieved; the self-heating mold is adopted for preparation, curing equipment does not need to enter or exit, the quality stability of the arc rod piece is improved, and the size precision is high.

Description

technical field [0001] The invention belongs to the technical field of composite material structures, and in particular relates to a triangular-section arc-shaped composite material truss and a preparation method thereof. Background technique [0002] The main body of the truss structure is connected by truss members and truss joints. It mainly relies on the coordinated distribution of load force on each member to reduce the weight of the members. Through optimization design, this type of structure can be designed to be tensile-dominated mechanical stress state, the smallest weight index under the same load can be obtained. Carbon fiber composite materials have comprehensive excellent characteristics such as small specific gravity, high specific strength and specific modulus, good moisture resistance, fatigue resistance and wear resistance. The material components replace the metal materials such as aluminum alloy and titanium alloy in the previous truss structure. The deve...

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Problems solved by technology

[0004] D.K.Darooka, D.W.Jensen's book "Advanced space structure concepts and their development" (Collection of Technical apers-AIAA / ASME / ASCE / AHS / ASCStructures, Structural Dynamics and Materials Conference, v1, p562-571, 2001) discloses an Iso The Truss TM structure is continuous through the longitudinal rods, and the helical oblique rods form an equilateral triangle. Conceptually, a linear truss with excellent mechanical properties can be formed, but the configuration is very complicated, and it needs to be wound as a whole. At the same time, it is impossible to form a curved composite truss structure

[0005] Chinese patent document CN101418627A discloses an ultra-lightweight all-composite truss and its preparation method. The composite material includes more than three axial composite rods and a number of circumferential ribs and helical cross ribs. The preparation method sequentially passes through the fixed core Mandrel, winding mandrel, binding, heating, curing, demoulding to form a full-composite truss, but the truss is a linear truss structure, which is not suitable for curved surface skeleton structures such as aerostats. At the same time, the preparation process is complicated and the molding efficiency is low. Low, not enough geometric precision

The structure is analyzed using three-sided spiral web members, 5-way and 6-way intersecting joints, but due to the many overlapping parts of the limbs, it is difficult to make it. Therefore, only DragonPlate nodes are used to splice 1.5m trusses, and the load-bearing test is carried out Research

At the same time, the truss structure is in a linear form, which is not suitable for curved surface skeleton structures such as aerostats. The truss joints are cemented with thin shells, the outer layer is wound with fibers, and finally molded by pressurized curing. The forming process is complex and inefficient.

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