Finite-element analysis-based method for designing profile of autoclave molding fixture of composite material member

A composite material component and autoclave forming technology, which is applied in computing, special data processing applications, instruments, etc., can solve the problems of high development cost, long cycle, and unguaranteed component profile accuracy, and improve design quality. and efficiency, ensure accuracy, and eliminate the effect of low component accuracy

Active Publication Date: 2012-07-11
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

This method is mainly based on experience, and cannot quantitatively and accurately grasp the degree of mold repair. The dimensional accuracy of the formed composite material components is low, and the surface accuracy of the components cannot be guaranteed. , high development cost and long cycle

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  • Finite-element analysis-based method for designing profile of autoclave molding fixture of composite material member
  • Finite-element analysis-based method for designing profile of autoclave molding fixture of composite material member
  • Finite-element analysis-based method for designing profile of autoclave molding fixture of composite material member

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Embodiment Construction

[0020] A design method of autoclave forming tooling surface based on finite element analysis, which is suitable for the preconditions of known curing process system, component geometry and material parameters, tooling support structure and material parameters of autoclave forming composite components . Below to Image 6 The cylindrical composite material component shown is taken as an example to illustrate the implementation process of the tooling surface compensation design method. The tooling is cylindrical, the thickness d is 12mm, the component thickness is 5mm, and the inner radius is 200mm. The specific implementation steps are as follows:

[0021] (1) The initial surface G of the tooling is directly extracted from the component design surface P, and the tooling structure is designed.

[0022] (2) Divide the same grid for the component and tooling surface in step (1), and realize the solidification of the component according to the multi-field coupling relationship and...

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Abstract

The invention relates to a finite-element analysis-based method for designing a profile of an autoclave molding fixture of a composite material member, belonging to the technical field of autoclave molding fixtures of composite material members. The finite-element analysis-based method comprises the steps of: firstly, using a member design profile as an initial profile of the fixture; developing a finite element program for realizing curing deformation analysis of the composite material member to obtain a profile of the composite material member after cured and deformed; under a global coordinate system, calculating a displacement L of each node, judging whether a size precision of the composite material member meets the requirement, if yes, completing the design of the profile of the fixture; if not, compensating a displacement of the node of the composite material member along the direction of a coordinate axis to the node of the profile of the fixture to obtain a new profile of the fixture; and repeating the processes of analyzing and judging a finite element until the profile of the fixture, meeting the precision requirement, is obtained. According to the finite-element analysis-based method, the problems that the profile of the fixture is directly extracted from the profile of the member and then the deformed member is repeatedly repaired are solved, the member forming precision is improved, and the development cost is reduced.

Description

technical field [0001] The invention relates to a finite element analysis-based method for designing the profile of autoclave forming tooling for composite material components, and belongs to the technical field of composite material component autoclave forming tooling design. technical background [0002] Carbon fiber reinforced resin-based composites have been widely used in the aviation industry due to their high specific strength, high specific stiffness, corrosion resistance, and designability, and their usage has become one of the signs of aircraft advancement. At present, domestic aviation companies mainly use the autoclave forming process to manufacture composite components. During the forming process, the composite material components are subject to certain temperature and pressure, resulting in solidification deformation. This increases the difficulty of subsequent processing and assembly of the component, and even leads to the scrapping of the component when the ...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 李迎光张吉李楠垭杭翔万世明
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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