The steel circular plate of thickness δ is loaded by kinematic enforcement - rotation of the outer edge by known angle of ϕ* (that corresponds to distributed load with some radial moment M*).
1. find the ϕlimit – the limiting value of rotation, for which the maximum stress in the plate reaches σy = 360 MPa. At which point of the plate the first yield value is reached?
2. what is the value of maximal deflection, f, that corresponds to ϕlimit? Is the linear plate bending theory still valid for ϕlimit ?
steel E=2E5 MPa, ν=0.3, b=500 mm, δ=2 mm