A method for analyzing the crushing characteristics of a thin-walled beam with a twelve-right-angle section with variable thicknes

A technique of twelve right angles and characteristic analysis, applied in special data processing applications, instruments, geometric CAD, etc., can solve problems such as lack of, inability to use finite element method or test method, and analysis of thin-walled beam crush performance

Active Publication Date: 2019-03-29
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 detailed structural geometric models in the conceptual design stage of the crashworthiness of the vehicle body, and provides a variable thickness 12 Analytical method for crushing characteristics of thin-walled beams with right-angled sections

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  • A method for analyzing the crushing characteristics of a thin-walled beam with a twelve-right-angle section with variable thicknes
  • A method for analyzing the crushing characteristics of a thin-walled beam with a twelve-right-angle section with variable thicknes
  • A method for analyzing the crushing characteristics of a thin-walled beam with a twelve-right-angle section with variable thicknes

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Embodiment

[0231] Next, the present invention introduces the method for analyzing the crushing characteristics of the thin-walled beam with variable thickness with twelve right-angled sections in combination with the embodiments.

[0232] The variable thickness twelve right-angle thin-walled beams selected in the embodiment are made of aluminum alloy, the grade is Al6061T6, and its stress-strain curve is as follows Figure 5 The mechanical properties of the material are shown in Table 1, and the schematic diagram of the thin-walled beam section is shown in Figure 4, where d 1 =20mm,d 2 =20mm,d 3 = 20mm, a = 20mm, t max =2.5mm,t min = 1.5 mm.

[0233] Table 1 Table of mechanical properties of AL6061T6 material

[0234]

[0235] Ⅰ According to formula (1), substitute the maximum thickness t max =2.5mm, minimum thickness t min = 1.5mm, d 1 =20mm, the calculated thickness gradient k=0.1.

[0236] Ⅱ Calculate the actual thickness t of the corner part of the ultra-folded unit of th...

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Abstract

The invention belongs to the research field of automobile passive safety, in particular to a method for analyzing the crushing characteristics of a thin-walled beam with a twelve-right-angle section with variable thickness. The method comprises the following steps of: 1, expressing the thickness using parameters at any position on the edge of the section; 2, using that maximum thickness and the minimum thickness to obtain the actual thickness of the folding unit for at the corner of the section; 3, different regions of the super-folding element are brought into the energy dissipation formulasof different thickness regions , and the energy dissipation of the super-folding element with variable thickness is calculated; 4, that unknown quantity in the energy dissipation expression of the variable thickness super-folding element is obtained by using the principle of the lowest energy; 5, calculating that concrete value of the average crushing reaction force. An analytical expression of average crushing reaction force of a twelve-right-angle thin-walled beam with variable thickness is derived, which can realize forward design of the thin-walled beam and shorten development period in the conceptual design stage of vehicle body crashworthiness.

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 thin-walled beam with a variable thickness twelve right-angle cross-section. Background technique [0002] Thin-walled beam structure is a common energy-absorbing component in the fields of automobiles, ships, aviation and aerospace, etc. Its axial crush deformation is stable and energy absorption is significant, and it is an important topic in the study of crashworthiness. At present, the crashworthiness design of thin-walled beams usually adopts a combination of experiment and finite element analysis. That is, large deformation nonlinear finite element software is used for simulation calculation and structural optimization design, and finally verified by experiments. However, due to the frequent replacement of schemes in the early stage of design, the finite element calculation is quite time-...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/15G06F2119/06G06F30/20Y02T90/00
Inventor 张君媛郑丹枫陆炳全刘茜周浩张秋实姜哲李仲玉舒畅王丹琦
Owner JILIN UNIV
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