Impact Strength Analysis of Body Structure Based on a MBD-FEA Combined Method 2024-01-2243

In the field of automobile development, sufficient structure strength is the most basic objective to be accomplished. Typically, method of strength analysis could be divided into static strength and dynamic strength. Analysis of static strength constitutes the major part of the development, but the supplement of dynamic strength is also dispensable to assure structural integrity.

This paper presents a methodology about analyzing the impact strength of body structure based on a Multi-body Dynamics (MBD) and Finite Element Analysis (FEA) combined method.

Firstly, the full vehicle MBD model consists of Curved Regular Grid (CRG) road model, Flexible Ring Tire (FTire) model and dynamic deflection-force bump stop model was built in Adams/Car. Next, Damage Initiation and Evolution Model (DIEM) failure criteria was adopted to describe material failure behavior. Besides, six groups of specimens including tensile, R5, R20, shear, T-shear and punch were designed to identify parameters of the DIEM model. Then, misuse condition test on the Impact road was conducted by test vehicle equipped with Six-Axes Wheel Force Transducer (WFT) and corresponding experimental data were correlated with MBD simulation results to check the accuracy. Finally, an explicit dynamic analysis of body was performed in Abaqus to investigate the structural misuse behavior.

On the whole, simulation results of loads and structure response are in good accordance with experiment. Noticeable plastic deformations on the top mount area of body were observed and macroscopic fracture generated on the ribs of upper mounting seat was very close to that of real failure state.