Morning,
I am running a deflection calculation to size the amount of force needed to pre-bow a piece of rectanglur steel 2mm. I have run the calculation two ways and am getting different results. Can someone point me to where my error is? Thanks in advance
Here is one run
Y= P(L^3)
--------
3EI
P=7500 lbs L(length of moment arm) = 4.8inches E(Modulus of elasticity) = 205 Gpa = 29732737 psi I(Moment of inertia) = .781 in^4
Deflection = 7500 * ((4.8)^3)
--------------
3 * (29732737) * (.781in^4)
Y = 829,440
-------
69663802
Y = .011 in = .254 millimeter
Here is the other run
P=7500lbs = 3401 kg L = 4.8 in = 12.192 cm E = 205 Gpa = 2090418 kg force/cm^2 I = .781 in^4 = 1.9 cm^4
Y = (3401)*((12.192)^3)
-------------------------
3 (2090418) (1.9)
Y = 6163558
-----------
11915382.6
Y = .51cm
Y = 5.1mm