Method for simulating fracture failure of air-inlet grille by adopting EFGM in car collision

Abstract

The invention discloses a method for simulating fracture failure of an air-inlet grille by adopting an EFGM (Element Free Galerkin Method) in car collision. The method comprises the specific steps of performing discrete element processing on the air-inlet grille by adopting an N-hedron unit, and presetting a background mesh; endowing the air-inlet grille with a multilinear elastoplastic kinematic hardening constitutive material, wherein separation occurs when bearing force between discrete points is judged by adopting a cohesion element fracture method; and calibrating constitutive parameters of the air-inlet grille of a corresponding car model and parameters of an EFGM algorithm through a test: assembling the air-inlet grille into the complete car model, and performing simulative analysis on complete car collision. The EFGM introducing the cohesion element fracture method avoids the mesh-dependence defect of a conventional FEM (Finite Element Method), so that random characteristics of a crack path can be ensured, the material performance can be expressed more truly, and a collision event can be recovered more truly.

Description

technical field [0001] The invention belongs to the field of automobile collision modeling, in particular to a method for simulating the fracture failure of an air intake grille by using EFGM in automobile collision. Background technique [0002] The application of CAE technology in the automotive industry has been gradually improved. From the design of auto parts to the performance analysis of the whole vehicle; from the rigidity of the car structure to the analysis of the internal and external flow field; a great guiding role. Especially in the field of automobile collision, CAE analysis has formed a series of mature NCAP and other specifications, which provide detailed analysis guidance in vehicle collision events. However, at the present stage, in the CAE simulation of vehicle collision events, FEM is the main method. Although FEM has the advantages of high efficiency, stability and high accuracy, it also has some unavoidable defects. In the simulation evaluation of b...

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Problems solved by technology

Among these relatively mature and highly commercialized meshless technologies, SPH is more suitable for describing the flow behavior of materials with strong fluidity and materials, while DEM has the problem of insufficient accuracy in evaluating the strength of materials.

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