CBUSH, CBUSH1D, CELAS

Karthik Guda

1. I have done few static simulations by using different elements which I mentioned in question.
2. I have solved for stiffness in all directions we have provided 1N/mm and 5N/mm and 100N/mm but is i check the displacement and stresses for all results. there is no much stress variations is observed. almost same stress is showing for all the applied stiffness parameters.
3. can you please elaborate the mentioned elements. My problem statement is Rubber Damper which is used naval industry for validating shock loads.
4. please treat this as urgent.

Adriano_Koga

it would be nice to have more details and pictures on your structure to help figure out what is your question.

if you take some structure, like a pen, with some stiffness, and you apply a force stretching it, you would get some stress level due to its geometry. Let's say stresses are 10MPa. Let's say, if it is a polymer, it would stretch by 10mm.

Now let's change the material/stiffness to a pen made of steel. Apply the exact same force. Stress levels will be exactly the same. Displacements though, would decrease a lot, probably by 1/100th.

The force acting on the strcuture is still the same, and the acting stresses are the same. Of course, depending on the material properties, if stresses go to high, the material may or may not fail…

My point is, if you've changed stiffness of all your springs at once, the force distribution and load path wouldn't change, so i wouldn't expect a change in stress distribution. Now, if you change them differently, this could change the load path, and then, change the stress distribution.