Challenge

Week - 9 Material modeling from raw data

TITLE: MATERIAL MODELLING FROM RAW DATA

OBJECTIVE: To create material from raw data using strain stress curve

Dog bone specimen is used to test the material model.

MAT024 material card is used to model the data.

As the curve obtained from this data is in Ksi unit systen therefore changed the unit system of the stress data(1Ksi = 0.00689476).
The curve obtained from the raw data is too much noisy therfore to smooth the curve,curve fit operation is used in excel.
Therefore 4th order polynomial is used to fit the curve.

From this data using formulae converted the strain and stress values to true stress and effective plastic strain.
True strain = ln(1+engineering strain)
True/effective stress = engineering stress(1+true strain)
Effective plastic strain = true strain - true stress/E
Given E = 20.9e+06 psi = 144.100 Gpa

As the value of elastic region is inserted manually therfore curve is defined only for the plastic region.

For boundary condition,Set of node in one direction is constrained and other set of nodes in opposite direction is given to motion in x direction.

Defined the control termination card at a termination time of 1ms.
Defined database d3plot for results and contour.
As the simulation is quasistatic in nature therfore for more accuracy implict solver is used to run the simulation.

RESULTS:

Stress increases with respect to time and keeps constant after 0.8ms.

Strain increases gradually with respect to time.

Stress increases with strain with respect to time and keeps constant after 0.5ms.

MAX STRESS = 0.26 Gpa

CONCLUSION:

By comparing the final stress vs strain plot with the intial plot of stress and strain ,we can see that both are similar upto some extent.
Raw data data is extracted and material is modelled using effective stress and strain plot.
Implict analysis is performed for more accuracy of results.

Ship work like this
in your own course.