Learning Forum

[Han-yu]

Hi,

I recently am working on a compressed ring simulation.

The whole process is divided into three steps.

First, The ring is clamped by certain force and deformed.

Secondly, the deformed ring slot into a pocket which diameter is a little smaller than the ring. (The clamped force still applied.)

Thirdly, remove the compressed force and see how much spring force and pressure generated on the ring and pocket wall.

Could you show me how to run this simulation process?

The setting of my simulation is attached to this discussion.

Compressed ring simulation.wbpz

[peteroznewman]

nThere are several issues with this model. What version of ANSYS are you using.nYou should be using Contact Step Control, which means the contact is turned off in step 1 when you compress the object, then turn contact on in step 2. This is not available in old versions of Mechanical. https://forum.ansys.com/discussion/10032/contact-step-controlnYou therefore don't move the parts in space, move the solid bodies so that they are in position.nCut the size of the block to be slightly larger than the spring. You are wasting time computing elements that do nothing.nYou must have 4 elements through the thickness of the spring and 4 elements along the width of the spring.n

[Han-yu]

Hi Peter,nI tried your suggestions today.nI upgraded the Workbench to the newest version and applied the Contact Step Control.nBut the part behavior doesn't look right, could you help me figure it out?nThank you very much for your time and help.nnBest Regardsnn

[peteroznewman]

[Han-yu]

Hi Peter,nMay I asked what did you modify in this model?nThe goal of this simulation is to simulate the silicon compressed ring assembly process.nThe substrate pocket will be slightly smaller than the ring, and I assumed the forces I applied will create enough bending to make the ring fit into the slot.nAnd after the force release, the ring should generate a spring force on the slot.nAfter all, the attached file in the reply didn't work on my computer, the error shows as below.nYour product license has numerical problem size limits, you have exceeded these problem size limits and the solver cannot proceed.nI tried to remove the mesh or steps, but it doesn't fix the simulation.nWhat should I do to make the simulation work properly?nThank you for your help.nnBest Regardsnn

[peteroznewman]

nSince you are on a Student license, you must keep the node number < 32,000. I suggested you cut down the size of the block.nCheck how many elements under the Statistics category of the Mesh Details.nYou don't need to simulate the squeezing of the ends to simulate the ring in the block.n

[Han-yu]

Hi Peter,nI followed your suggestions and try to generate the mesh, however, it still crashed.nAnd after several crashes, it occupies my disk storage and slows down my computer.nCould you teach me how to solve this problem?nAnd also are there some tips to reduce the number of mesh?nThank you.nn

[Han-yu]

Hi Peter,nI switched my license from the student version license to the research license.nThe mesh limit is now fixed.nHowever, the simulation still failed. nThe error message shows: An internal solution magnitude limit was exceeded. Please check your Environment for inappropriate load values or insufficient supports.nElement 26590 (type = 2, SOLID186) (and maybe other elements) has become highly distorted. Excessive distortion of elements is usually a symptom indicating the need for corrective action elsewhere. Try incrementing the load more slowly (increase the number of substeps or decrease the time step size). nBut I didn't apply load in my simulation.nCould you help me take a look and teach me how to correct it?nPlease refer to the attached file for my simulation.nnThank younBest RegardnArraynn