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Method for processing material performance of composite material at wet fitting joint

A composite material and material performance technology, which is applied in the field of processing the material performance of composite wet assembly joints to achieve the effect of high engineering application value

Active Publication Date: 2012-09-19
XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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  • Description
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  • Application Information

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Problems solved by technology

For example, the influence of adhesive layer hardness and tightening torque on the mechanical connection of composite structures is an influencing factor that should be paid attention to, but there are few specific analysis methods and result classification methods for these two influencing factors.

Method used

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  • Method for processing material performance of composite material at wet fitting joint
  • Method for processing material performance of composite material at wet fitting joint
  • Method for processing material performance of composite material at wet fitting joint

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Embodiment Construction

[0035] The invention provides a stress analysis and modeling method for the edge of a mechanically connected bolt hole, adopts a three-dimensional finite element modeling method, and determines a reasonable element size to ensure the rationality of the analysis result.

[0036] (1) Geometric dimensions of hole edge analysis model

[0037] Based on the diameter d of the hole, in the load direction (connector load), half of the model length L must be at least greater than 4d, that is, L / 2≥4d, and in the vertical load direction, half of the model width must be at least greater than 2.5d , ie W / 2≥2.5d, the model is constrained at one end of the load direction.

[0038] (2) Element type and size

[0039] Hexahedron element (HEX8) is selected as the element. In the transition area or fillet area, a small amount of pentahedron element (WEDGE6) can be used due to the need. In the hexahedron element, the aspect ratio or aspect ratio or aspect ratio is preferably 1 : 1, the maximum ra...

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Abstract

The invention belongs to a composite material technology, and relates to a method for processing the material performance of a composite material at a wet fitting joint in a mechanical connecting wet assembly process for a composite material structure. The influence of adhesive layer hardness and tightening torque in the mechanical connecting wet assembly process for the composite material structure is analyzed, a material laminate model, an adhesive layer model and a bolt model are analyzed respectively, toroidal and radial stress curves of a hole edge of a composite material laminate are drawn, and a method for analyzing the stress of the composite material hole edge and an engineering stress treatment method are provided, so that the problem of deficiency of analysis means for the influence of the adhesive layer hardness and the tightening torque on the stress concentration of the composite material hole edge in the wet assembly process is solved; and a composite material hole edge stress extraction and treatment method is provided, is helpful for the direct judgment of engineering technical personnel in the stress concentration of the hole edge, and has high engineering application value.

Description

technical field [0001] The invention belongs to composite material technology, and relates to a method for processing the material properties of composite material wet assembly joints in a composite material structural mechanical connection wet assembly process. Background technique [0002] The anisotropy and brittleness of composite materials make its failure mode quite different from that of metal materials. Due to the brittleness of the material at the joint, it will not yield like metal materials and cause stress dispersion. Often in various forms. At present, the wet assembly process is generally used in the mechanical connection of composite structures, and the quality of the assembly process also has a great influence on the stress distribution at the joint. For example, the influence of adhesive layer hardness and tightening torque on the mechanical connection of composite structures is an influencing factor that should be paid attention to, but there are few speci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 李龙彬谭申刚郑洁刘宗晖
Owner XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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