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Im am trying to find out a predicted deflection of a steel rectangular beam of uniform cross section (which is 12.7mm wide x 6.4mm deep). The beam is simply supported at both ends and has a span of 660mm. The load is to be placed in the middle of the beam.

I have the formula to be used to work out the deflection for the above case which is

d = C WL^3/EI

C = the constant of 1/48

W = the load

L= the span cubed

E = Youngs Modulus

I = 2nd Moment of Area

Ive worked out the I to be 277

E = 200kN/mm^2

W = 40

L= 0.66 cubed

Tried plugging in these numbers but they not comming out anywhere near the values I was expecting.......about 4mm (I think)

Can anybody see anything wrong with what im entering or any obvious mistakes

Thanks for any advice guys

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# Homework Help: Predicted deflection of a rectangular steel beam

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