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

AIM:

1.Create a block of 10mmx10mmx10mm dimensions with 10 elements for each direction and use the material card attached (Ogden_Material.k).

2.Use appropriate boundary conditions to simulate tensile behavior for the model.

3.Compare the results for the simulation using ELFORM = 1, 2, -1, -2.

PROCEDURE:

1.import the given keyword file (ogden_material.k)

2.Create a block of 10mmx10mmx10mm dimensions with 10 elements for each direction.

create the section solid for 4 different element formulation 1,-1,2,-2.

Material card attatched (ogden_matrial.k) that representative of the material properties are given below.

given database cards like binary D3plot,Extent_binary and also gievn ascii option those are glstat,matsum,elout etc,.

given termination end time in *control_termination i.e. 1ms

given implicit cards like implicit_auto,implicit_general,implicit_solution and implicit_solver.

given the boundary conditions spc set along y, xalongz and z anlongy.and also given prescribed motion set along y direction.

Results:

observed stresses and srains at various times.Effective stress is 9.073e-2 and Effective plastic strain is 9.748e-2

from the above contour plots we can observe maximum values we get at various time cases.

Calculation of Engineering stress,Engineering strain and stretch ratio:

from the output results true stress and true strain values are ploted.

True stres=Engineering stress(1+Engineering strain) from this equation

Engineering stress=true stress/(1+Engineering strain)

True strain=ln(1+Engineering strain) from this equation

Engineering strain=[(ex)^True strain]-1

Stretch ratio=1+Engineering strain

by using the above equations calculated the Engineering stress and Engineering strain values for Elform1,Elform-1,Elform2 and Elform-2.

conclusion:

the bolck is created by the mat ogden like valcunized rubber, this block was performed a simulation of uni axial tensile test for different cases such as elform1,

eform-1,elform2 and elform-2.the Trues stress and true strain are taken form the simulation and calculated the engineering stress,engineering strain and stretch ratio.

the engineering stress value for different elform simulation is approximately0.5mpa.

the uniaxial testile test was performed bty using implicit solver.