Simplified analysis method for bending property of box-section thin-wall beam

Abstract

The invention discloses a simplified analysis method for the bending property of a box-section thin-wall beam, belonging to the field of car body design. The simplified analysis method for the bending property of the box-section thin-wall beam is mainly used for analyzing the bending deformation of the box-section thin-wall beam during car body collision in a concept car body finite element modelfor anti-collision researches at the concept design stage of a car. The simplified analysis method for the bending property of the box-section thin-wall beam mainly comprises four steps, i.e. classifying plastic hinge lines according to whether the lengths of the plastic hinge lines are changed or not, calculating rate of energy dissipated by the plastic hinge lines, calculating rate of energy dissipated by convex annular surfaces and calculating the bending property of the entire structure. The simplified analysis method for the bending property of the box-section thin-wall beam has the advantages that the requirements on the modeling of the simplified frame structure and the anti-collision analysis of the car body can be satisfied very well, designers can be assisted to rapidly extract the bending properties of the thin-wall beams, the cockamamie work for traditional finite element analysis and tests is avoided, the rapid performance assessment and the rapid modification of a preliminary design plan are realized, and the design cycle is shortened.

Description

technical field [0001] The invention belongs to the field of automobile body design, and is mainly used for the crashworthiness research in the conceptual design stage of automobiles. It specifically relates to a simplified analysis method for the bending characteristics of box-section thin-walled beams, which is used as a conceptual finite element model of the vehicle body to analyze the bending deformation of box-section thin-walled beams in vehicle body collisions. Background technique [0002] Box-section thin-walled beams are a common structure in body load-bearing components, such as front and rear longitudinal members of the body. Mastering the bending characteristics of box-section thin-walled beams is the basis for car body products to achieve crashworthiness performance indicators in the conceptual design stage. In the conceptual design of the automobile body, the conceptual model of the automobile must first be established, which is a highly simplified detailed m...

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Problems solved by technology

[0006] In view of the cumbersome modeling and analysis process in the existing conceptual design technology of automobile body, the purpose of the present invention is to propose a simplified analysis method for the bending characteristics of box-shaped thin-walled beams, that is, to use the box-shaped thin-walled beam structure under non-axial The mechanism of bending deformation under load, an improved analysis method of bending characteristics that satisfies kinematics allowable conditions is proposed

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