Youngs Modulus

mink_man

its stress over strain isnt it? how do you get the stree and strain? and to get .01 proof stress do you get .01 of the whole length, say 8?

.:FuZion:.

mink_man wrote: »

its stress over strain isnt it? how do you get the stree and strain? and to get .01 proof stress do you get .01 of the whole length, say 8?

1. Yes.
2. Strain = Extension divided by Original Length
3. Stress = Max Load divided by CSA ( Pie x R^Squared )
( Pick the second set of values on the table when using both these formulae )
4. You get .01% of the gauge length. ie 8mm Gauge length = 8 Divided by 100, Multiplied by .01. What ever value you get draw a line from the X - Axis parallel to the curve until the line meets the curve. Draw across and get a value off the Y - Axis. Then divide that value by the CSA to get the proof stress.

Of course all this isint necessary if its a Stress Strain graph as you can read the values straight from the question. But one of those came up last year.

mink_man

whats CSA, is it cubed surface area? how do i get this?!

kowloon

Cross sectional area.

mink_man

is that given?