Home / Examples / Stress Analysis [Galileo] / Example 68: Analysis with Overlapping Meshes

Example 68: Analysis with Overlapping Meshes

General

• A shaft is inserted into a ring. The outer diameter of the shaft is slightly larger than the inner diameter of the ring.
   

• In this example, overlapping meshes are used for the ring hole and the shaft. A similar analysis is performed in Example 42 where the initial strain is used.
  Unlike Example 42, it is not required to calculate the initial strain manually in advance in this example. Also, the analysis can be performed even if the initial strain is not obtained.
   

• The distributions of displacement and stress are solved.
  

• Unless specified in the list below, the default conditions are applied.
  

• Obtain this session's project file. (Right-click and choose 'Save link as')
  
  

• Results will vary depending on Femtet version and the PC environment.

 

To create the overlapping meshes, the ring hole and the shaft must be meshed in the different meshing spaces. If meshing in the same meshing space, an overlapping area is absorbed in either one of the bodies and
the overlapping meshes will not be created.

Overlapping Bodies	Same Meshing Space (meshes do not overlap)	Different Meshing Spaces (meshes overlap)

 

Analysis Space

Item	Settings
Analysis Space	3D
Unit	mm

 

Analysis Conditions

Item	Settings
Solver	Stress Analysis [Galileo]
Analysis Type	Static Analysis
Analysis Options	None

 
 

Model

For a stable contact analysis, the calculation is performed on the half of the model in X direction, and a symmetric boundary condition is applied to the plane of symmetry.

Body Attributes and Materials

Body Number/Type	Body Attribute Name	Material Name
0/Solid	RING	001_Al *
1/Solid	AXIS	001_Al *

* Available from the material DB

 

 

Body Attribute Name	Tab	Space Number
RING	Analysis Domain	1
AXIS	Analysis Domain	2

Boundary Condition

The boundary conditions are set as follows.

Boundary Condition Name/Topology	Tab	Boundary Condition Type	Setting
Target/Face	Mechanical	Contact Surface	Select [Contactor Surface].
Contact/Face	Mechanical	Contact Surface	Select [Contactee Surface].
Fix/Face	Mechanical	Displacement	Select all of X/Y/Z components. UX=0, UY=0, UZ=0
Symmetry/Face	Symmetry/Continuity	Plane of Symmetry	Select [Reflective] on the Symmetry/Continuity Tab
uy	Mechanical	Normal Displacement	Displacement is zero

Results

The contacting face pressure is shown below. The vectors show the pressure and directions on the contacting face. The unit is [Pa].

 

 

The model dimension, the fitting differential, and the material are the same as in Example 42. Similar pressure is generated.