Modeling and Analysis Method of Car Body Girder Skeleton Collision Considering Plastic Hinge Characteristics

Abstract

The invention relates to a car body beam frame collision modeling and analysis method considering characteristics of a plastic hinge, and belongs to the field of car body design. The method comprises the steps of firstly solving a cross section area and a bending-twisting inertial moment characteristic of the cross section, with a complex shape, of a car body beam frame; secondly creating a car body beam frame model; thirdly generating a plastic hinge model characteristic of a thin-walled beam unit, and assigning a value to a material characteristic of a Belytschko-Schwer (BS) beam unit, wherein an MAT 29# material type of LS-DYNA software is selected for the material characteristic; and finally generating a keyword text file that can be solved by the LS-DYNA software, and calling the LS-DYNA software to perform collision solving. The car body frame model is established by adopting the beam unit; the plastic hinge model simulates bending, twisting and crushing deformation of a beam to perform collision analysis; a solving result is reliable, the user operation is convenient, and the modeling period is greatly shortened; and the method has an important guide effect for car body design.

Description

technical field [0001] The invention relates to the field of automobile body design, and relates to a collision modeling and analysis method of a car body beam skeleton, in particular to a car body beam skeleton collision modeling and analysis method considering the characteristics of plastic hinges. It is mainly used to quickly solve the static mechanical properties and dynamic plastic hinge mechanical properties of thin-walled beam elements, so as to realize the rapid modeling and solution of car body beam skeleton. Background technique [0002] The collision design of automobile body structure is one of the core technologies in the automobile industry. In order to shorten the design cycle and test costs, computer-aided design and analysis techniques have been widely used in the automotive industry. Computer simulations of car crashes usually use finite element analysis. The car body structure is stamped from sheet metal and spot welded. In the finite element simulation...

AI Technical Summary

Problems solved by technology

Due to the large number of quadrilateral plate elements, the degree of freedom of the structure is about 1 million, so the calculation amount of the solution is large, which seriously affects the design cycle

At present, there is only linear finite element analysis of the body structure created by the beam element, that is, static bending and torsional stiffness calculation, frequency dynamic stiffness calculation, and there is no dynamic nonlinear finite element analysis to simulate the collision of the body structure

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