Aluminum Plate (6061-T6) Floor Hatch Cover

[haggis]

Hoping someone can help me with this. Can anyone give me a formula to calculate the maximum concentrated load on an aluminum hatch cover. The cover being 36" square 3/8" thick and supported on four sides with a one inch bearing.

Thanks in advance.

 

[mobe]

Check out Roarks "Stresses & strains" which gives formula for stress & deflection of plates.