Uniaxial Tensile test

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#Uniaxialtensiletest
Uniaxial Tensile test (Grayphite iron casting)
Graphite Iron casting is a form of cast iron in which the shape of the graphite particles is between that of conventional grey iron flakes and ductile iron where the graphite is in spheres.
showing Effective stress vs Effective plastic strain
Effective plastic Strain = Total true strain – True stress / E
Where E is Modulus of Elasticity which is 141.10
Effective stress is a true stress

While modelling a material we focus upon non-linear curve (linear portion is shown by E value) Non-linear curve is easily shown by ls-dyna or while we modelling the material.
To Model a Linear behavior of material, only three independent parameter required E (Youngs Modulus), u (Poisons ratio) and ρ (density for units).
The linear relation as per the straight line is described only by the slope. i.e. E (Youngs Modulus)
When the material enters into the non-linear zone the curve needs to define using the non-linear function according to the way material behaves under different types of loading.
Depending upon the way material behaves, it can be described using constitutive law, such as
Elasto-Plastic material
Hyperelastic material
Viscoelastic material
Two points of verification
Parameters of verification (input data with results)
1. Modulus of Elasticity (E)
2. Engineering yield stress 0
3. Engineering ultimate stress
4. Elongation at failure
5. Reduction in area
Plot a simulation result with experimental data, if you given a input and if it is not working as input then definitely there is some problem in our model, so we need to check results with our input values.
Parameter of verification (results with test)
1. Different pattern on location: When part is failed, these points need to match, we can’t match with 100% but if you match up to 80 to 90% that is fine.
2. Load deformation plot
3. Location of stress strain value
Factor need to consider while modelling a material card
• Required accuracy
• Model complexity
• Solver ability
• Computational cost
Workflow of Material Model
• Extract the data from the diagram
• Clean the data and visually confirms that it matches the original data
• Convert the data to Kg mm ms unit system
• Process the data and create the material as demonstrated
• Use the material model as per dog-bone specimen and validate the same
#Materialtesting
#materialmodelling
#Materialcardcreation