Hi there, im in my final year of mechanical engineering and have been given a lab report which involves finding an equation which seems to be non existant.Hopefully a clever forum member can answer my question.

According to my lecturer there is a formula/equation which will calculate deflection of a strut for any given load, as we know a strut deforms with less than the calculated buckling load.

The strut is pin ended on both ends.
L=458
load = 10:90 in increments of 10.
I=45mm^4
A=60mm^2
b=30mm
d=3mm

any help would be greatly appreciated.
Tom