Analysis method for collapsing force of two common steel rectangular-section thin-wall beams under symmetric mode

Abstract

The invention provides an analysis method for collapsing force of two common steel rectangular-section thin-wall beams under a symmetric mode. The method comprises the steps that first, an average collapsing counter-force expression of rectangular-section thin-wall beams made of steel plates with the same material and the same thickness under a symmetric deformation mode is derived; second, average collapsing counter-force expressions of rectangular-section thin-wall beams made of two steel plates with different materials and different thicknesses, rectangular-section thin-wall beams made of two steel plates with different materials and the same thickness and rectangular-section thin-wall beams made of two steel plates with the same material and different thicknesses under two mixed formsare derived respectively; and engineering approximation is performed on the average collapsing force expressions solved in the second step under the three conditions. Through the method, under the condition that only dimension parameters and material characteristics are available, the collapsing performance of the two common steel mixed rectangular-section thin-wall beams is accurately predicted and analyzed, forward design of the thin-wall beam structure can be realized, simulation trial errors and experiment times are greatly reduced, the development cycle is shortened, and design cost is lowered.

Description

technical field [0001] The invention relates to the field of passive safety research of automobiles, and relates to a method for analyzing the crushing force of two commonly used steel rectangular cross-section thin-walled beams in a symmetrical mode, and specifically relates to a method for analyzing steel plates made of two different materials and having different thicknesses, and made of two materials A method for analyzing the crushing force of steel plates of different but the same thickness and of thin-walled beams of rectangular cross-section welded by two steel plates of the same material but of different thicknesses. 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 b...

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Problems solved by technology

[0005] In order to solve the problem that the finite element method or test method cannot be used to analyze the crush performance of thin-walled beams due to the lack of detailed structural geometric models in the conceptual design stage of the crashworthiness of the car body, the present invention proposes two commonly used thin-walled steel beams with rectangular cross-sections in a symmetrical mode The crushing force analysis method, under the condition of only size parameters and material properties, is used for steel plates made of two different materials and different thicknesses, steel plates made of two different materials but the same thickness, and steel plates made of two materials the same but different thicknesses Analysis of the crushing performance of welded thin-walled rectangular cross-section beams

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