Simple Beam Load

[Anonymous]

Hi there just needing some help understanding the fusion 360 simulation compared to my hand work 😄

In any case what I am trying to work out is why my hand work is so far out from what the simulation is giving me

this is the sim http://a360.co/2mfDGoM

as you can see it has a displacement of around 3.6mm

however working by hand

I = ((BxD^3)-(bxd^3))/12 = 2.08492x10^-7

Deflection y = - WL^3 / 48EI

= -2000*3^3 / 48 x 235x10^9 x 2.08492x10^-7

=-0.022961 m  = -22.96mm of deflection

Can anyone see where I am going wrong?

Thanks for the help,

Sean

[Anonymous · Accepted solution]

I think the difference you get is because your model is totally fixed on both ends in any direction. If I add degree of freedom along Z-axis I get results close to your calculation.

Notice... I'm not a simulation guy at all. I almost do not understand how to read the picture above. And absolutely have no idea what are the formulas you wrote. 🙂

[Anonymous]

Thank YOU! what degree of freedom did you give it?

[Anonymous]

I set ends constraints to this:

So, it adds friction along the bar and simulation will calculate the deflection without extension (tension or whatever how it's called ).