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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 properties of composite wet assembly joints to achieve the effect of high engineering application value

Active Publication Date: 2014-05-28
XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 modeling method for the edge of a mechanical connection 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) Geometry size 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 4d, that is, L / 2≥4d, and in the vertical load direction, half of the model width must be at least 2.5d , Ie W / 2≥2.5d, the model is constrained at one end in the load direction.

[0038] (2) Element type and size

[0039] The element is hexahedral element (HEX8). In the transition area or fillet area, a small amount of pentahedral element (WEDGE6) can be used as required. In the hexahedral element, the aspect ratio or aspect ratio or aspect ratio is preferably 1 :1, the maximum ratio should not exceed 10:1.

[0040] (3) Processing method of thr...

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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 a composite material wet assembly joint of a composite material structure mechanical connection wet assembly process. Background technique [0002] The anisotropy and brittleness characteristics of composite materials make its failure mode very different from that of metal materials. Due to the brittleness of the material at the joint, it will not yield and disperse the stress like metal materials. The nail hole load is uneven and its failure Often in various forms. At present, the wet assembly process is commonly used in the mechanical connection of composite material 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 material structures are influencin...

Claims

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Application Information

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Patent Type & Authority Patents(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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