Optimization Design And Simulation Research Of TRB Used For B-pillar Inner Panel

Energy saving, environmental protection and safety are the main goals of the design anddevelopment of the auto industry at present. After the launch of side collision regulations(GB20071-2006) and the new evaluation standard (C-NCAP) standards and specification inChina, the study of vehicle impact safety in our country has been proceeding further. Automakers pursue two parallel development goal is to raise the car collision resistance and tosatisfy the lightweight design requirement of energy saving and environmental protection atthe same time. The car body structure optimization design and application of new materialsand new technology is the important way to realize auto lightweight. Tailor rolling blanks(TRB) is a new type blank with continuous variation of thickness. Compared to the traditionalplates with uniform thickness, it can allocate the material for a more reasonable structure withgood lightweight properties on condition that it could meet the regulations of safetyperformance.Firstly, the article detailed the main cross section of thin-walled beam structures in thebody structure form and the application of continuous variable cross-section which wasrespectively built into several kinds of thin wall beam structure finite element model withdifferent cross section, different thickness ratio, different length ratio. And the models wereused to analyze the static mechanical properties in bending condition and twisting conditionusing by NASTRAN. With the reference of the initial condition and restraint condition invehicle frontal crash and side crash, the initial conditions and constraints, LS-DYNA wasused to analyze the dynamic mechanical properties of thin-walled beam in the condition offrontal impact and side impact, which supplied the basis of the application of Tailor RollingBlanks to the actual body structure. Secondly, by the method of equivalent energy, simplifiedmodel of lateral confining structure is set up from the main deformation and energyabsorption structures extracted from the vehicle side impact. The nonlinear quadratic responsesurface approximation model is set up through the orthogonal test design. by controlling the Bpillar plate in occupant chest location of deformation and collision speed, the sheet will beredistributed and optimization, improve the impact of continuous variable cross-section panel used B pillar within the board size parameters of the optimal solution. Finally the optimalsolution was applied into the original model for modeling and validate the response surfacemodel prediction accuracy, applying for the wider use of the car structure in continuousvariable cross-section sheet provides some experience for reference.The paper mainly conducted the mechanical properties of thin wall beam structureresearch in application of TRB plates. The simplified model was extracted from the sideimpact. On the basis, the important mechanical components in lateral impact-B pillar hasbeen optimization designed. compared with original design, the quality of optimized B pillarwas reduced by0.014kg, the deformation reduced by0.083mm and the collision speedreduce by1298.07mm/s.