Hi All As shown in the attached image, I have a simply supported beam with a load of 150kN acting at the center of the beam span. E = 210 GPa rho = 7800 kgm-3 span = 250 mm After solving this in FE solver, I got maximum displacement to be ~4mm (at node 52) But, on using the theoretical relation of delta = P* l^3 / (48*E*I), it is about ~11mm. Can somebody please help me on this ? how to co-relate this. Some observations: 1. There is no hourglassing. 2. Beam looks compressed by about 0.8mm at the center at the end of solution.