- #1
Jonski
- 42
- 0
Homework Statement
I am trying to find the maximum deflection in a brass beam, however after taking a physical reading the theoretical answer I get is quite off and I am wondering what I am doing wrong.
Homework Equations
They tell us the max deflection is( Load*Length^3)/(48*E*Second Moment of Area)
They also give us that E = 105GPA for brass
The Attempt at a Solution
The mass was 100g so load = 0.98N
Distance is 0.4 m
The problem I have is finding the correct moment of area as I think this is were I am getting it wrong. I have seen that for a rectangle it would be b*h^3/12
Then I = 0.4*0.00318^/12 = 1.07e-9 m^4
Putting this all together I get 11.63e-6m = 0.0116mm
The physical answer I got was 0.29mm.
Any ideas on what I am getting wrong