A composite material antisymmetrical wrapping square tube crushing characteristic analysis method

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...

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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 detailed structural geometric model in the conceptual design stage of the crashworthiness of the vehicle body, and provides a composite material antisymmetric Analytical method for crushing characteristics of thin-walled beams wrapped in square tubes

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