Week-6 Calculate the Stretch Ratio by comparing the ELFORM (-2,-1,1,2) with Ogden_Material Model.

OBJECTIVE:- To perform a uniaxial tensile stress on a block of Solid (10mm x 10mm x 10mm) using Ogden Material for different elemental formulations and compare their results.

PROCEDURE:-

Modelling:-

A cube with the dimension 10mm x 10mm x 10mm was created by going to Mesh Panel>Shaper Mesher>Apply>Done.

Section:-

Different Cards were created for different Elemental Formulations (-2,-1,1,2) under different file saves, an example of one such card is shown below.

Material:-

MAT_OGDEN_RUBBER card was used as a material for this Simulation. It is the hyperelastic material and the values were taken from the given MAT_OGDEN.k card.

Boundary Conditions:-

Boundary SPC-

Since it is a tensile stress, we have fixed one side and applied translational motion to the other side.

Constraining entire one face along X and all rotational direction.

Constraining mid nodes lying on Y and Z directions.

Constraining mid nodes lying on Y and Z directions.

Prescribed Motion-

Control Cards:-

Post-Processing:-

X-Stress and X-Strain for ELFORM = 1:

X-Stress and X-Strain for ELFORM = 2:

X-Stress and X-Strain for ELFORM = -1:

X-Stress and X-Strain for ELFORM = -2:

Tabular Data:-

ELFORM	X-STRESS MPA	X-STRAIN
1	6.0066	1.94231
2	5.99643	1.94114
-1	6.00247	1.94159
-2	6.0011	1.94128

CONCLUSIONS:-

The different Elforms show nearly same results in terms of stress and strain and also in term of Stretch Ratio, but computational time varies. For a simple tensile stress problem like this one, though not much of a computational difference is shown but it will elavate when geometry will get comples with more finer mesh.