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 the above figure is a perfect example for elastomer domes underneath keyboard
buttons and boot seals. 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 linear material properties are:
Linear Material
Young’s Modulus
2.1E5 MPA
Gasket Material
Poisson Ratio
0.3
Density
7.8E-9
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