Identification Of Material Parameters Of Door Trim Panel Based On Side Crash Sled Test

In the car side impact test, the occupant injuries are mostly caused by the directcollision of the passengers to the side structure of the vehicle, however, the interiorparts of the vehicle directly contacting with the passengers are mostly the door trimpanel. In the simulation model of vehicle side impact, the accuracy of the materialparameters of finite element model has a direct impact on the credibility of simulationresults. That is to say, when carrying out full-scale car side impact simulation,accurate material parameters of the door trim panel is a prerequisite to obtain rationaloccupant dynamic responses. However, these parameters are usually difficult to beobtained directly.This paper is to obtain the material parameters (elastic modulus and yield limit)of the door trim panel through a method of the side impact sled test and computersimulation, and then the parameters was applied to the full-scale side impact finiteelement model.In the existing experimental conditions, a side impact sled with the real door andB pillar was developed, and then the dynamic responses of the side impact dummy(ES-2) were obtained through the side impact sled test. The finite element model ofthe sled test equipments was established according to the side impact sled testprogram and was well validated by matching the simulation results and test results ofthe sled acceleration. Elastic modulus and yield limit were chosen as experimentalvariables, and emulational experimental design was set up by using a full factorialexperimental design approach, the simulation results were processed and the dummyinjuriy values for every program were obtained. The dummy injuriy values of thesimulation and test results were compared and elastic modulus (8.0GPa) and yieldlimit (0.04GPa) of the door trim panel material model parameters were obtained. Thedummy injuriy values of the simulation approached the dummy injuriy values of thetest results most, so it could be concluded that the material parameters of the groupapproached the actual material parameters most. According to the side impactregulation standard, the finite element model of the moving deformable barrier wasestablished and validated. Based on the CAD geometry model of one home madevehicle, the finite element simulation model of the vehicle had been built up using thesoftware HyperMesh. And the obtained door trim board material model parameterswere applied to the full-scale car model. The full-scale car model with the use of theES-2side impact dummy was well validated according to the side impact regulation standard.