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A Calculation Method for Stress Distribution of Interference Fit Joints of Composite Materials

A technology of interference fit and calculation method, which is applied in calculation, special data processing applications, instruments, etc., can solve the problems of increased calculation time and high cost of calculation time, and achieve the effects of high speed, low cost and high calculation accuracy

Active Publication Date: 2017-09-22
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

For the research on the residual stress of the interference fit joints of composite materials, finite element simulation and numerical calculation methods are mainly used (Kim S, He B, Shim C, and Kim D, "An experimental and numerical study on the interference-fit pininstallation process for cross-ply glass fiber reinforced plastics (GFRP), Composites: Part B, vol.54, pp.153-162), the calculation time cost is very large, and the calculation time increases exponentially with the increase of calculation accuracy

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  • A Calculation Method for Stress Distribution of Interference Fit Joints of Composite Materials
  • A Calculation Method for Stress Distribution of Interference Fit Joints of Composite Materials
  • A Calculation Method for Stress Distribution of Interference Fit Joints of Composite Materials

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Embodiment Construction

[0045] The main parts involved in the method of the present invention are bolt 1, composite material plate 2, 3, wherein the initial radius of bolt is r 0 , The initial radius of the bolt hole of the composite plate is R 0 , the thickness of the composite material plate is t, the width of the composite material is W, and the shortest distance between the bolt hole and the end of the composite material plate is E. For interference fit connections, bolts are installed into composite bolt holes by cold extrusion.

[0046] The concrete steps of this method are as follows:

[0047] (1) Modeling of bolt complex stress function

[0048] Before the bolt interference fit deformation, the cross section of the bolt is circular, and its initial radius is r 0 , let it be a simply connected region S p , the boundary circle is L p . When the normal contact stress P and tangential contact stress T act on the bolt boundary L p , its complex stress function can be expressed as:

[0049]...

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Abstract

The invention relates to a method for calculating the stress distribution at the edge of a hole in an interference fit joint of a composite material component. Based on the elastic mechanics complex potential theory of Muskhelishvili and Lekhnitskii, the stress distribution models of the nail and the hole are respectively established, and the contact relationship before and after the deformation of the bolt-hole is analyzed to determine The bolt-hole contact stress is brought into the hole edge stress distribution model to realize the accurate calculation of the residual stress field of the composite material structure interference fit joint hole edge, which lays the foundation for structural connection design and strength analysis.

Description

technical field [0001] The invention belongs to the field of composite material structure processing and assembly, and in particular relates to a method for calculating the stress distribution at the edge of a hole in an interference fit joint of a composite material component, which is used for accurately calculating and analyzing the residual stress distribution at the edge of a hole after the interference fit connection of the composite material component. Background technique [0002] Compared with traditional metal materials, composite material structures have higher specific strength, specific stiffness, and good corrosion resistance. They are more and more widely used in structural weight-sensitive fields such as automobiles, aviation, and aerospace, especially carbon fiber. Reinforced composite materials (CFRP) have become an important material for modern aircraft structures. The main load-bearing structure of composite materials generally adopts mechanical connectio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 程晖宋丹龙刘平张开富
Owner NORTHWESTERN POLYTECHNICAL UNIV
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