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My Aim is to determine the youngs modulus of aluminium from the data we get from tensile strength test.

The attached excel sheet contains all the data i am using such as elongation,load value(which is in kN i have converted to N for calculating Stress)

For stress,

I am using the formula

Stress(ε)=Force/Area

For strain,

I am using the formula

Strain(σ)=ΔL/L

My issue's are,

P.S:This is my first post in the forums so do forgive me for making errors/not following protocol.If I did make such errors please tell me how to fix them :)

The attached excel sheet contains all the data i am using such as elongation,load value(which is in kN i have converted to N for calculating Stress)

For stress,

I am using the formula

Stress(ε)=Force/Area

For strain,

I am using the formula

Strain(σ)=ΔL/L

My issue's are,

- The linear portion of the stress-strain curve(engineering) is a vertical line when i plot it with excel.This does not let me calculate the slope.
- When i have attempted to calculate Youngs modulus with the formula ε/σ,I am getting a value of

758681.8 N/mm^{2}which is approximately 10x the value which is given online.

P.S:This is my first post in the forums so do forgive me for making errors/not following protocol.If I did make such errors please tell me how to fix them :)