Home / Examples / Stress Analysis [Galileo] / Example 6: Deformation of Spring Plate

Example 6: Deformation of Spring Plate

General

• The deformation of a spring plate under forced displacement is analyzed.
   

• If an object is deformed beyond the limit of its elasticity, the large deformation occurs. It is treated as a nonlinear problem.
  See Technical Note Analysis of Large Deformation (Geometric Nonlinearity).
   

• The distributions of displacement and stress are solved.
   

• Unless specified in the list below, the default conditions will be 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.

 

Analysis Space

Item	Settings
Analysis Space	3D
Model Unit	m

 

Analysis Conditions

To solve the deformation caused by static load, the static analysis is selected.
As the element has rotation and large strain involved, [Large Displacement] option needs to be selected as well.

This will activate Galileo's nonlinear solver.

Item	Settings
Solver	Stress Analysis [Galileo]
Analysis Type	Static Analysis
Large Deformation	Select [Large Displacement].

 

Model

The spring plate is a rectangular solid body. The material is polycarbonate.

The plate is mechanically fixed at one end.

The forced displacement is applied on the other end.

Body Attributes and Materials

Body Number/Type	Body Attribute Name	Material Name
0/Solid	PLATE	000_Polyethylene(PE) *

* Available from the material DB

Boundary Conditions

Boundary Condition Name/Topology	Tab	Boundary Condition Type	Settings
FIX/Face	Mechanical	Displacement	Select all X/Y/Z components. UX=0, UY=0, UZ=0
PULL/Edge	Mechanical	Displacement	Select the Z component. Z = -15 [m]

Results

The simulation is divided in 20 substeps. Calculate each step with a gradually larger displacement.

20 results are output for the steps between 0.05 [Step] and 1 [Step].

 

The number of substeps is 20 by default. It can be adjusted on the Step/Thermal Load tab.

All the results of substeps are output by default. Only the final result of 1 [Step] can be output.

 

The contour diagram shows the Z displacement at 1 [Step].

The scale adjustment ratio on the Displacement tab of the Graphics Setup is set to 1.

The tip of the plate is curling towards -Y direction.

 

If [Show all results summary] is selected, the external force and reactive force are listed in the table below.

 

 

The reactive force at the boundary condition FIX is a total of 6.163e+6 [N] in + Z direction at 1 [Step].

The external force at PULL is a total of 6.163e+6 [N] in -Z direction at 1 [Step].

 

For comparison, the displacement without Large Displacement is calculated and the result is shown below.

The tip is not curving back downward towards the root. That is unnatural.