Hi Experts,
I have a simple question to ask...
I am trying to silmulate a analysis of Base frame of a flat bed trailer. I have uploaded the pic.
As in the picture i have fix the king pin location from front & axle location from behind. u can see the green arrows to see the fix location.
and then add a load at appropriate position.
But after running the simulation, what i find that stress is developed near axle position where i have fixed the assembly.
But in real life normally base frame has more damage at goose neck position.
What i am doing wrong? do iahve to take the suspension type boundary conditon or what.
please advice...
HI Devi:
I would be tempted to try an elastic foundation support at the suspension locations. Alternatively, build-in some parts to represent suspension support springs (with appropriate stiffness) and use no-penetration contact between the supports and the frame. Then ground the supports. Either method can help the frame to flex a bit more at the suspension supports, perhaps more like real life. The issue is that "fixed" boundary conditions are infinitely rigid and can cause a lot of stress. Be aware that no-penetration contact makes the problem nonlinear (the solver has to iterate and stiffness calculations have to be re-done at appropriate intervals), so it takes longer to run. The elastic foundation support method is more straightforward and should solve very quickly. Hope that helps. -Tony