Impact Experimental Analysis and Computer Simulation

In this paper, an automotive bumper system (a bumper connected to a frame through joints/connections) is set up for small impact tests (nondestructive tests). During the tests, a steel bar is raised to certain highs then released from there and hit onto the bumper system, the bumper system is fixed to the ground through fully constraining the end of two shocks, the reaction forces at the end of shocks during the whole impact process are measured and investigated in order to determine how they are transferred to the joints then to the rest part of the frame. Also, other important experimental data are collected and studied to reflect the actual impact process. A finite element model is created for the automotive bumper system and the impact test is also simulated on the computer using ANSYS. The results from the experimental tests are compared and correlated to the finite element simulation. From the comparison, it is found that the experiment results and FEA results matches very well and the validity of the computer model is then verified. Additionally, this paper also includes a hand calculation of the impact problem, where the bumper system is modeled as a simple spring-damping system and solved using classical dynamic theory; the hand solutions are also compared to the experimental results and the FEA results to verify the correctness and reliability of the impact tests and computer simulation.

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