Certification of road barriers according to the European Standards presupposes a successful crash test in order to validate the behavior of the road restraint system under real working conditions. This means that in the product design cycle a procedure is integrated that is neither cost nor time effective. The probability for the road restraint system to fail the crash test is not negligible and therefore the cost risk increases. In order to reduce the factors that can cause a crash test failure and avoid unnecessary repentance of such an expensive procedure, crash test simulations are conducted using the finite element method. It is versatile due to the fact that it can simulate a great variety of crash conditions, design versions and can produce results of significant accuracy. However, there are many parameters that must be understood, taken into account and properly adjusted. In the current paper a crash simulation of a small passenger car and a lightweight truck on road restraint system is presented focusing on the choice of the parameters that affect the Finite Element Modeling as well as the difficulties that arise during the implementation of the simulation. However, in order to achieve realistic results the influencing parameters have to be carefully chosen. In order to speed up the model fine tuning, it has proved to be convenient to use two models of the vehicle: A coarse and a fine one. Even though the results obtained by the coarse model are generally inaccurate, they can assist to the selection of the initial parameter values. Last but not least, the quality and size of the mesh are important, because the element length is proportional to the time step, thus significantly affecting the time required for the completion of the analysis.
Vehicle crash simulation on road barriers
2010
10 Seiten, 8 Bilder, 1 Tabelle, 8 Quellen
Conference paper
English
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