CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS

Big difference in simulation&analytical result of a simple static structural problem

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Search this Thread Display Modes
Old   May 18, 2017, 19:46
Default Big difference in simulation&analytical result of a simple static structural problem
New Member
Chengjun Li
Join Date: Mar 2017
Posts: 7
Rep Power: 6
cli21 is on a distinguished road
Hi everyone,

I build a folded beam structure using Solidwork with the following shape and dimensions.

the thickness the of structure is 0.025mm.

I want to know the stiffness of the structure, using the analytical equation I got the stiffness is 976N/m. The material is silicon with a Young's modulus of 160Gpa.

Then I use Ansys workbench to do a simple static structural analysis.

1. I import the geometry.
2. I choose material Si with young's modulus 160Gpa.
3. I set the element size 10um, and generate the mesh.
4. I fixed the lower surface and add a 1uN force on the top surface
5. From the displacement, the stiffness from simulation is 792N/m, which is very different from the analytical result.

I think there shouldn't be so large deviation between simulation and analytical result for such a simple problem. I must have done something wrong, could anybody point it out?

cli21 is offline   Reply With Quote

Old   May 28, 2017, 13:59
New Member
Join Date: May 2017
Posts: 5
Rep Power: 6
Lapis1 is on a distinguished road
1. Are you sure the material's Young's Modulus really is 160GPa? Have you checked it yourself? Are you sure the type of Silicon you're using doesn't have any sort of "directional Young's Modulus" (ie stiffer in one orientation than in another)?

2. Refine the mesh further multiple number of times and see if there's any deviation from your original simulation's result, and whether the results start to converge. If it does, then a finer mesh is needed.
Lapis1 is offline   Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
[Workbench] Using Solution of Static Structural Problem in Another Static Structural Problem qwe11rty22 ANSYS Meshing & Geometry 0 August 17, 2016 07:50
Static or Total Pressure Inlet Boundary, Understanding problem Overdue CFX 13 August 4, 2016 07:25
Transfer from CFX to Static Structural student82 CFX 1 March 2, 2011 04:17
extremely simple problem... can you solve it properly? Mikhail Main CFD Forum 40 September 9, 1999 09:11
? Simple CFD problem Davy Main CFD Forum 0 August 21, 1998 06:19

All times are GMT -4. The time now is 15:56.