How is Stress and Strain Calculated in a Towing Bar?

[cjmonedogg]

Homework Statement

Towing bar diameter = 15mm
Max car weight = 3000kg
length of bar = 2.5m

trying to calculate the stress in the bar

and the strain if stretched by 0.2 %

Homework Equations

Stress=Force/Area
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The Attempt at a Solution

Area=(pie)x r(squared)

r=diameter/2
r=7.5
area=(pie) x 7.5mm(squared)
[/B]

 

[billy_joule]

What is the definition of strain?
How is stress and strain related?