Hi there,
I am trying to run a simulation to produce an analysis on the chassis of a car (stress, strain, disp etc). I have tried to make the model as accurate as possible by applying all relevant loads. However, when I run Optistruct it says the following;
*** WARNING # 5628
The compliance is negative or large 6.83807e+015.
The rotational displacement has large magnitude, 5.82769e+009 degrees (larger than 180).
The rotational degree of freedom may not be constrained properly in the model.
subcase id = 4
grid id = 187
component = 4
*** WARNING # 312
In static load case 4
the compliance is negative or large 6.83807e+015.
Optimization/buckling analysis cannot be performed.
due to possible rigid body mode.
I believe this is due to the model being under-constrained? (Please correct me if I'm wrong), however, I'm not sure where I can reduce the DOF without overly constraining the model.
The model is attached. Any help is greatly appreciated,
Cheers, Laura
Unable to find an attachment - read this blog
