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[FAQ]

Imagine you have a cylinder fixed in bottom and being pulled in top. The Poisson effect tends to make the cylinder want to shrink radially. It is prevented from doing so due to the fixed support, which gives a reaction in X in the axisymmetric case. These X forces will be canceled out when you consider the whole 360 degrees model. In 2D axisymmetric model, X direction is the radial direction in a cylindrical coordinate system and it’s direction is changing from 0 to 360 degrees. In 3D model, X direction is in Cartesian coordinate system and is fixed. For this reason, force reactions in X are not directly comparble in 2D axisymmetric and 3D full models. In 3D model you may create a local cylindrical coordinate system and then scope force reaction in the cylindrical coordinate system. The X direction will represent radial direction and the value should be the same as in the 2D model.