Hi. I have been doing some FEA modelling with solid works and am trying to calculate my deflection for a point load at the centre of a clamped periphery (not simply supported) circular thin plate. I need to calculate the theoretical values to make sure that my FEA is correct The formula I have found is this : w=(-W/16pieD)*(a^2-r^2*(1+2*ln(a/r))) for r not = to 0 w= deflection W= load in N a= fixed max radius (m) r = variable radius (m) D=flexual rigidity = Eh^3/(1-v^2) E=Young's modulus (Pa) h=plate thickness (m) v=poissons ratio When I plug my relevent data into the formula I get stuck because i am using a point load at the centre....therefore my r=0...I cannot find the formula for when the load is at the centre. Can anyone please help? I have been having no trouble doing this with a distruited load (pressure) but it's the point load that I have been having trouble with. Thanks in advance.