A triangular cross-section curved composite truss and its preparation method

Abstract

The invention discloses a triangular cross-section arc-shaped composite material truss, which is composed of mutually parallel outer chords, first inner chords and second inner chords connected by triangular-section web members to form an arc-shaped three-dimensional structure, adjacent The outer chords, the first inner chords and the second inner chords between the triangular cross-section web components are respectively provided with a first outer diagonal member, a second outer diagonal member and an inner diagonal member, and are connected with The four-way joint is fixedly connected, and each rod is made of carbon fiber composite material; the invention also discloses a preparation method of a triangular cross-section arc-shaped composite material truss. The invention forms a large-curvature composite material truss structure through the connection of triangular cross-section web members, and has high dimensional accuracy and good load performance. The invention adopts a self-heating mold for preparation without entering and exiting curing equipment, which improves the quality stability and high dimensional accuracy of the arc rod.

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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