|May24-12, 11:55 AM||#1|
Finding second moment of area using Euler's theory?
Hi, I have just started a HND in Aeronautical Engineering and its been awhile since I have done any maths, need help with finding the second moment of area using Euler's theory!
I have Euler's equation : Force (P)= (pi squared (pi2)) * (modulus of elasticity (E)) * (second moment of area (I)) / (effective length squared (L2))
I then got I = P*L2/pi2*E (is that correct?)
P = 170KN - factor safety of 3 needed - 510KN
L = 8m
E = 200 GPa
I am struggling with the units, I need I in cm4 and can't work it out!
|May29-12, 07:28 AM||#2|
solve it for m^4 by taking P=170*1000N; L=8m, E=200*10^9Pa. You will get ur answer in m^4. Convert it into cm^4 by dividing it by 100^4. Also check the question carefully to make sure ure using the correct formula for I as it is different for different euler conditions which u'll find in ur text book or lecture notes.
|May29-12, 07:29 AM||#3|
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