Master thesis and internship[BR]- Master's thesis : The validation process of virtual crash testing of vehicle restraint system[BR]- Integration Internship

Abstract

The main objective of this work is to validate and verify the virtual crash test of the vehicle restraint system by using Hyper-mesh software to generate the mesh and LS-Dyna software for pre and post-processing. The test was conducted in compliance with European standard EN 1317. These standards are the impact severity index level for the vehicle, the deformation of the system which is expressed as working width and vehicle intrusion including the normalized values, and the containment level of the vehicle. The barrier that has been used in this test is 3N.TU-BPL.71 and two types of vehicles TB11 and TB61 were tested. First, the model is built up followed by meshing each part separately using the hyper mesh software then assembling the parts and setting the parameters, constitutive law, and the boundary condition using LS-Dyna software. Then, three tests were performed the first one is just the barrier with applied gravity to check the numerical stability, the second test is the barrier with vehicle TB11, and the last test is the barrier with vehicle TB61. The results were validated in accordance with the European standard properly whereas the deformation of some parts of the barrier against TB61 was not as same as the physical one whereas for TB11 the deformation was almost the same. To conclude, the virtual test and the physical test have similarities and differences as it is impossible to reproduce the same deformation as in reality, taking into account that the virtual test is a numerical way aimed to have approximation results not the same results since the numerical way based on many assumptions. For example, the discretization in space is the first error produced in the software, and the time discretization by using an explicit scheme is the second error produced in the software.