deflection & FOS

hi,

i have an assembly of two c section joined and at its end it iswelded with brackets.
length of beam is(two c section) is 1900. actually according to myrequirement if a 2000kg f will applied deflection should be max4.5mm & FOS is 2.

take any material according to requirement.

now i have to prove in analysis that deflection & FOS shouldcome in cosmos.

i have tried all the technique but it does not get proper result.

if i get deflection 4.5mm then fos may be too small.....

so how to do this?SolidworksSimulation