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LS DYNA – Material_Modelling_Hyperelastic By Enos Leslie Mechanical Engineer 8th April 2023 AIM Model a hyperelastic material by comparing data to stress/strain experimental curve data. The rubber models from Ls Dyna Deck considered are: Mooney Rivlin Constant (MAT_077, N = 1) Ogden Rubber Constants…
Leslie Enos
updated on 10 Apr 2023
LS DYNA – Material_Modelling_Hyperelastic
By Enos Leslie
Mechanical Engineer
8th April 2023
AIM
Model a hyperelastic material by comparing data to stress/strain experimental curve data. The rubber models from Ls Dyna Deck considered are:
OBJECTIVE
PROCEDURE
IMPORT
A 2d dogbone specimen is imported into Ls-Prepost to be used for the simulation and creation of the material model.
MATERIAL
Firstly, a material card is created. Hyperelastic rubber MAT 077 is used for the phone with unit system of (kg/mm/ms).
CURVE INPUT
The engineering strain and stress data points are incorporated into the material card by using *Define_Curve.
SECTION
The model is a 2D material, and a thickness of 1mm is specified for the dogbone specimen.
Fully integrated shell element formulation "16" is selected.
BOUNDARY CONDITION
PRESCRIBED MOTION SET is made to define the displacement boundary in the - X direction., a prescribed motion displacement of the rigid body is selected (0 to 1)mm, A load curve is defined below:
Right end side of the specimen nodes is selected for the application of X-axis displacement.
The nodes on the far left side of the dogbone are fixed in all DOF (Degree of freedom) except for vertical Y.
Two midpoint nodes are selected to constrict the specimen in a fixed position on the Y-axis.
CONTROL CARDS
Control_Implicit_Solution
A linear solution is selected as can be seen in the picture below:
Control_Implicit_General
This card activates and controls the analysis. The parameters specified is seen below
Control_Implicit_Auto
This card is used for time-step adjustment.
NB: Hourglass control card is activated
DATABASE
Binary D3plot is specified.
Data Extent Binary is specified to get an output for stress/strain by setting STRFLG=1
CONTROL TERMINATION
This keyword controls the end time of the simulation. DT is specified to 1ms.
The simulation is run for both Mooney Rivlin (N=1) and then Ogden rubber (N=2) and the results are compared to the engineering stress experimental data.
POST-PROCESSING