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From reviewing the preceding equations it is apparent that for this plate bending problem the material properties are defined by four constants, namely, , xE , yE νy E'x , E'y ,Vy and G.
For this example the stiffness of the plate spanning in the X-direction is assumed to be twice that of the plate spanning in the Y-direction. In other words, the stiffness for bending about the Y-axis is twice that for bending about the X-axis. Thus E'x E is equal to 2 2E'y E. For this example these constants are taken as:
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In Model A orthotropic material properties are used. Here the constants , xE , yE νy , E'x , E'y, Vy and G are input directly into the material properties definition for the model. In this model those constants are referred to as modulus of elasticity for direction 1 (e1), modulus of elasticity for direction 2 (e2), Poisson’s ratio for plane12 (u12) and shear modulus for plane12 (g12), respectively. For the thick plate model the out-of-plane shear moduli, g13 and g23, are set equal to the G used in the thick plate isotropic model and then, similar to the thick plate isotropic model, the v13 and v23 area object stiffness modifiers are set to 1E+04 so that out-of-plane shear deformations are ignored. This is consistent with the thin plate solution and with the independent results.
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