Research On The Influence Of Front Windshield On The Structural Performance Of A SUV‘s Body

At present,the development of adhesive faster and faster.Direct paste method is an advanced technology used in the installation of automotive windshields at home and abroad.The use of direct paste method to install the car windshield can be used as a permanent body on the body,and the sealing effect is better,the appearance is more beautiful,the connection strength is greater.In recent years,the relevant scholars found that the front and rear windshield makes the sedan’s torsional stiffness increased by 10% or more,first-order torsional modal frequency increased by 43%,while with all the glass bus compared with the glassless bus torsional stiffness increased by 5.52%,indicating that windshield has a greater impact on the sedan’s and bus’ s body structure performance.However,the study of the effect of windshield on the performance of the hatchback body structure is small relatively.Their glass layout is very different,sedan with front and rear windshield,the bus contains front,rear and side glass,while hatchback only has front windshield that adhesive on the body.At the same time,hatchback,sedan and bus body shape,structure,bearing capacity distribution is also very different.Therefore,on the basis of previous studies,this paper studies the front windshield effect on the structure performance of the hatchback,the main object of the study is a newly developed SUV.Firstly,established the finite element model of the SUV’s body,and verified the accuracy of the model.Then,the method of bonding finite element model is studied by referring to the mature bonding simplification test in the related paper.Established the geometric model and finite element model of the front windshield.Finally,studied the front windshield influence on the performance and lightweight design of a SUV’s body.Studied four modeling methods of bonding finite element model(rbe2,common node,solid element+rbe3,solid element+common node);using two kinds of glass-tempered glass and laminated glass to simulate the experiment.It’s found that different glass forms effect on the simulation result is small and negligible.Compared with the characteristics of the four modeling methods and simulation results,select a better modeling method(entity unit+common-node).The result of the study have some reference value and can be applied to the subsequent engineering analysis.Established the model of SUV body and front windshield,and verified the accuracy of the model.Bending/torsional static stiffness and inherent vibration frequency of the SUV’s body /BIP were calculated.The results show that the torsional stiffness increases by 12.74% and the bend stiffness increases by 1.59%,the first-order torsional frequency increases by 43.3%,the first-order bending frequency decreases by 0.97%,when the front windshield is attached.It’s shown that the front windshield can improve the torsional stiffness and the first order torsional frequency of the SUV’s body.Therefore,in the early stages of car development and practical engineering analysis,cann’t ignore the front windshield on the hatchback’s torsional performance.Seven typical joints were selected,studied front windshield effect on the bearing characteristics of the SUV’s joint by taking the stiffness of the substructure and the bearing capacity of the substructure as the evaluation indexes.Early stage,the research group developed a reasonable lightweight optimization scheme for SUV without front windshield.However,we found that the front windshield on the SUV’s torsional stiffness and the first-order torsional frequency of a greater impact.Therefore,From the whole and a single component of two aspects,the original SUV’s and the optimized SUV’s affixed to front windshield,compared two cases of bending /torsional stiffness and natural vibration frequency,it’s found that after optimization of the SUV’s body paste the front windshield,some parts in the reverse load conditions,the displacement increases,torsional stiffness decreased significantly,the body performance degradation.Therefore,in the engineering analysis of the SUV body lightweight optimization,should be more consideration windshield impact on the body structure performance.