dear Johncao
sorry I do not have time to test your code, but I can give you few hints:
- have you tried to change the setings of the ADMM solver? it is strange
that the large block is almost exactly the analytical solution and the
small one is failing..
- projectchrono is dimensionless, so you can assume whatever unit system
you prefer. For example once I simulated wrist watch mechanisms, and I
assumed length unit to be mm. Remember that also forces, accelerations,
torques, densidies, gravity acc. etc. must be adjusted accordingly to
your choice.
alessandro tasora
On 25/08/2023 11:17, ZHAOYUAN CAO wrote:
Dear all,
Excuse me.When I tried to solve FEA mesh and rigid body contacts,
maybe there is a difference between the theoretical solution and the
results. Could you help me?
I am solving the problem of a sliding block sliding down a slope under
the action of gravity. But when I tried to solve it with the
small-scale slider model, I encountered a question where there was a
significant difference between the theoretical solution and the results.
The FEA mesh is C3D4, which is from abaqus. And the rigid plate is
built by chrono or imported from *.obj file which rotates 30
degrees along the z-axis.
First，the length, width, and height of this slider model are
1.4m，0.52m and1.4m respectively. The calculation results of
acceleration of node are as follows: ax is -2.0427, ay is -1.1785, and
az is 1.2e-5. The theoretical solutions are as follows: ax is
-2.0385，ay is -1.1768, az is zero. Compare two results, acceleration
of nodes is quite similar to the theoretical solution when stable
contacts occurred.
And then ,I tried to scale the FEA mesh to one tenth.But the
calculation results of acceleration acceleration of node when stable
contacts occurred are as follows: ax is -1.3986, ay is -0.7985, and az
is 0.0045. The difference is significant between the theoretical
solution and the results.
The attachment is my code and fea mesh.
And the second question is as follows. The default unit system is SI
in ProjectChrono. Can I change the unit system, for example changing
length unit to mm, changing density to tonne/mm^3, changing elastic
modulus to MPa ?
I hope you understand my questions.
Cheers johncao
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