# Beam deflection derivation

1. Jun 19, 2008

### ***ALLI***

1. The problem statement, all variables and given/known data
hi i am currently trying to mathcamatically derive the beam deflection formula for a double cantilever simple beam. i have the beam deflection formula y= (FL^3)/(48—Iε) as well as M ymax / I as well as 1/p = M/EI but am not sure how to link them together. any help will be apprecieated
Thanx :)

2. Jun 19, 2008

### PhanthomJay

See my questions noted in red. Are you looking for the derivation of the beam deflection formula $$d^2y/dx^2 = M/EI$$ ? You might want to google it.

3. Jun 30, 2008

### guorenguoren

you definitely need to consier the two beams as springs in parallel or series, then get the effective spring constant