The primary purpose of this simulation is to determine the fatigue life of the spot welds and parent material in a fully trimmed door during a complete opening-closing test. However, the results from the analysis could also be used to a number of different purposes, such as finding out the interior trim clips forces due to a door closing or perhaps study the vibration of the lowered window glass during a slam. The analyses are done with the window in different positions, at different door closing velocities and at different temperatures. The total life for the spot welds and the parent material are then achieved by multiplying the damage from each of the simulations with the correct number of cycles, adding the damage together to the Palmgren-Miner sum and finally invert it to get the total number of complete opening closing test before crack initiation / spot weld failure. The simulations are done with MSC.Nastran sol 129, which is a non-linear direct transient response analysis. A large number of comparisons with measured accelerations have been done, in order to verify that the movement of the door is correctly captured during the door slam event. The described method has been implemented in the daily door slam simulations at GME Trollhattan and the same method is also used to calculate hood and decklid / liftgate slam.
Saab 9-3 Door Slam Fatigue Simulations - Using MSC.Nastran SOL 129
2006
7 Seiten, 7 Bilder
Conference paper
English
Saab 9-3 Door Slam Fatigue Simulations - Using MSC.Nastran SOL 129
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