NONLINEAR BENDING CALCULATION OF BIMODULUS CIRCULAR PLATE

A bimodulus circular plate could form a compression and tensile area under external uniform loads. And it was regarded as a laminated plate composited of two kinds of materials. The static equilibrium equation of a bimodulus circular plate under external uniform loads was established using elasticity theory. Then the location of a neutral plane was determined by static equilibrium equation. The nonlinear bending deformation differential equation of a bimodulus circular plate was derived, and the relation between the circular plate center deflection and uniform loads was obtained. The FEM analysis shows that the method was reliable. The example shows that the deflection calculation of the circular plate which has a larger difference between tensile elastic modulus and compressive elastic modulus may as well not apply classical elastic theory with the same elastic modulus, and should use elastic theory with different elastic moduli in tension and compression.