spring plate

[HerrmannEl]

Hello together,

i have got some problems with a simulation of a spring plate. The green plate should move in the direction of the springplate until it colides with the massiv green body.

In my simulation i always get an error message because the deformation is to big.

Can someone please tell me what i am doing wrong?

Thx for your help.

 

[desertfox]

Could it be the spring as gone beyond its yield stress and taking a permanent set.

 

[HerrmannEl]

Thx a lot for your reply,

but I dont think so. In reality there is no problem with the spring metalsheet.

Is it correct to simply move the upper body against the spring metalsheet?

I have no idea how i should otherwise the force acting on the spring.

Has anyone work with something like an convex sheetmetall?

 

[desertfox]

Hi

I can see no reason that you why you cannot move the upper plate against the large block, however what the the spring made out of ie what material.
It's not very clear what your problem is.

 

[HerrmannEl]

Hi,

i attached a picture of the solution. As you can see the spring moves through the upper plate. Only the contact point /line gets pushed down.

I don't see a way to connect both parts (the moving upper plate and the convex spring) probably.

 

[drawoh]

HerrmannEl,

You have not told us what FEA software you are running, and you have not told us what error messages you are seeing, if any.

Lots of FEA models work on the assumption that deflections are small. I have a mechanics of materials book around here somewhere that claims that double integration method is reliable until deflection reaches around 10% of length. Try doing double integration on a spreadsheet, and then plot the results. You will see that my book makes complete sense.

Does your FEA do non-linear modeling? Try that.

If your FEA does not do non-linear modeling, you will have to pull out your mechanics of materials book and read up on moments and bending. You may have to solve this by numerical methods.

Perhaps you could post this question in an appropriate FEA forum!

--
JHG