Research On Implicit And Explicit Combined Simulation Analysis Of Quasi-static Failure Of Windshield

Due to the increase in the number of cars,the windshield glass bursts during the highspeed driving of cars,which leads to a higher and higher rate of traffic accidents.Therefore,the simulation study of the quasi-static damage characteristics of the windshield glass is very important to protect the safety of drivers and passengers.However,in the quasi-static simulation research of glass so far,the glass failure process has not been involved.Based on the intrinsic cohesive model,this paper proposes an implicit-explicit combined simulation method suitable for glass quasi-static failure analysis to describe the response process of glass quasi-static failure efficiently and accurately.First of all,based on the introduction of the classical fracture mechanics theory and the theory of cohesive model,a finite element model containing the cohesive elements and the prestress of tempered glass was established.The finite element software ABAQUS was used to analyze and evaluate the failure behavior of tempered glass,and the effectiveness of the cohesive model in analyzing glass failure was verified.Secondly,fully considering the advantages of implicit and explicit calculation methods in the loading phase and failure phase of glass quasi-static loading failure,the implicit-explicit combined simulation method is proposed,and the UVARM subroutine of ABAQUS is written to achieve high effective simulation analysis of glass quasi-static failure phenomenon.Based on the glass coaxial double-ring test,a 1/4 symmetry model of the glass coaxial double-ring test with an intrinsic cohesive model is established,and the results obtained by the combined simulation method are compared with the experimental results and the results obtained by the pure implicit simulation method.The analysis shows that,compared with the implicit method alone,the implicit-explicit combined analysis method has better calculation efficiency and higher calculation accuracy.At the same time,it verifies the accuracy of the cohesive model in analyzing glass failure phenomena.Finally,a quasi-static loading test plan for the windshield was designed,and the failure mode and quasi-static load-displacement curve of the windshield obtained from the test were analyzed,which provided data support for the simulation and evaluation of the quasi-static loading of the windshield.The 1/2 symmetrical finite element model of the windshield glass sample is established,and the interlayer adhesion between the glass and PVB is considered,and the implicit-explicit combined simulation method based on ABAQUS proposed in this paper is used for simulation.The failure mode of the simulation model is similar to the test results,and the error between the load-displacement curve and the test results is small,which verifies the validity and accuracy of the cohesive model and the implicit-explicit combined simulation method to analyze the quasi-static failure of the windshield.In summary,the implicit-explicit combined simulation method proposed in this paper and the quasi-static loading model of windshield based on intrinsic cohesive model can effectively simulate the quasi-static failure process of windshield,and provide an efficient and accurate simulation analysis means for the optimization design of windshield and the research on safety protection of drivers and passengers.