OS-E: 0120 Nonlinear Static Analysis with Hyperelastic Material
Model, under Compression Loading and Unloading
Behavior of hyperelastic material during loading and unloading phases. Typical examples
include rubber mounts, boot seals, and rubber keyboard domes.
Figure 1. FE Model
Model Description
The model in Figure 1 is an example for elastomer domes underneath keyboard
buttons and boot seals. Loading is applied on the green part which is constructed with steel
material, while the elastomer dome is of a hyperelastic material. Elastomers are typically
modeled as hyperelastic material with their incompressibility and instantaneous elastic
response for large strains. Hyperelastic material behavior are well described as strain
energy functions.
FE Model
Element Types
CHEXA
CPENTA
CQUAD
The material properties are:
Steel Material
Young’s Modulus
2.1E5 MPA
Poisson's Ratio
0.3
Density
7.8E-9 Tonne/mm3
Elastomer Dome Material MATHE
C10
400.00
C01
50.0
D1
0.001
Results
Review the element stress and displacement magnitude for loading and unloading conditions,
as shown in Figure 2.Figure 2. Element Stress Plot and Total Displacement with Loading and
Magnitude
Figure 2. Element Stress Plot and Total Displacement with Loading and
Magnitude