A composite material antisymmetrical wrapping square tube crushing characteristic analysis method

A composite material and characteristic analysis technology, which is applied in special data processing applications, instruments, geometric CAD, etc., can solve problems such as the lack or inability to use finite element methods or test methods

Active Publication Date: 2019-03-08
JILIN UNIV
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the problem that the finite element method or test method cannot be used to analyze the crushing performance of thin-walled beams due to the lack of a detail...

Method used

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  • A composite material antisymmetrical wrapping square tube crushing characteristic analysis method
  • A composite material antisymmetrical wrapping square tube crushing characteristic analysis method
  • A composite material antisymmetrical wrapping square tube crushing characteristic analysis method

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Embodiment

[0219] Next, the present invention introduces the method for analyzing the crushing characteristics of the fiber-reinforced composite material antisymmetrically wrapped square pipe proposed by the present invention in conjunction with the examples.

[0220] In the embodiment, the metal material wrapping the square tube is 6063-T5, the side length is 25mm, and the thickness is 1.6mm. The flow stress σ of the metal m =140MPa; the selected composite material is glass fiber epoxy resin composite material, the composite material is Type 30 glass fiber, and the matrix is ​​820 epoxy resin. The performance parameters of the composite material are shown in Table 1. The wrapped glass fiber is 2 layers, namely [45 / -45], the thickness of the composite material is h c = 1.27 mm.

[0221] Load boundary conditions see Image 6 , ⑥ is a rigid body with a downward moving speed of V, and ⑦ is a metal square tube wrapped in composite material.

[0222] Table 1 Performance parameters of glass...

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Abstract

The invention belongs to the automobile passive safety research field, in particular to a composite material antisymmetrical wrapping square tube crushing characteristic analysis method, including thefollowing steps of 1 carrying out the structure description and coordinate definition; 2 calculating the ultimate stress and elastic modulus of the composites; 3 calculating the yield membrane forceand plastic limit moment per unit length; 4 calculating that energy dissipated by the superfold element in the composite material antisymmetrically wrapped square tube; 5 calculating that final effective crushing distance and the final fold angle; 6 calculating that average crushing force. The influence of the ply angle on the performance is taken into consideration, and the theoretical expressionof the plastic limit moment per unit length and the yield film force are obtained. The invention derives the analytical expression of the average crushing force of the composite material antisymmetrically wrapped square pipe, and obtains the relationship between the structural parameters and the crushing performance. By utilizing the method for analyzing the crushing characteristics of the composite antisymmetrical wrapped square pipe, the forward design can be carried out quickly, the number of simulation and experiments can be reduced, and the design cost can be reduced.

Description

technical field [0001] The invention belongs to the field of automobile passive safety research, and in particular relates to a method for analyzing the crushing characteristics of a composite material antisymmetrically wrapped square tube. Background technique [0002] Thin-walled beam structures are widely used in industrial fields such as automobiles, aerospace, and ships. They are common load-bearing and energy-absorbing components. Their axial deformation is stable and can efficiently absorb kinetic energy during impact. The research and design of thin-walled beams is the research of crashworthiness. important issues in lightweight design. [0003] In the crashworthiness design of thin-walled beams, the experimental method is usually combined with the finite element analysis method, and the finite element model is established in the large deformation finite element analysis software, and the analysis results are compared with the experimental results to prove the validi...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/15G06F30/17G06F30/20
Inventor 张君媛陆炳全郑丹枫周浩张秋实姜哲李仲玉舒畅王丹琦
Owner JILIN UNIV
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