If you model the part with generalized plane strain elements, you must use the Keywords Editor to apply boundary conditions on the active degrees of freedom (U3, UR1, and UR2) at the reference node of these elements (see Adding unsupported keywords to your Abaqus/CAE model).
Hi Sadeq, In the boundary conditions dialog box, there is an option of choosing coordinate system. If you have chosen (the default) global coordinate system, then U1=Global X, U2=Global Y and U3=Gloabl Z. But you have the choice of selecting any of your own coordinate system, in which case U1,U2,U3 will take on those directions. Regards, NSK

course, and in principle ABAQUS should be able to find them, but it is not coded to do so. To demonstrate that this is the cause of the problem, in the Load module create a new BC that will constrain the displacements on the inner surface of the lowest hole in the wheel (see the figure). Prescribe a displacement U1=U3=0, U2= - 0.005. Then return to

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XASYMM Antisymmetry about a plane with X = constant (U2 = U3 = UR1 = 0;ABAQUS/Standard only). YASYMM Antisymmetry about a plane with Y = constant (U1 = U3 = UR2 = 0;ABAQUS/Standard only). ZASYMM Antisymmetry about a plane with Z = constant (U1 = U2 = UR3 = 0;ABAQUS/Standard only). PINNED Pinned (U1 = U2 = U3 = 0).
ABAQUS Scripting Reference Manual u1. A Float, a Complex, or a SymbolicConstant specifying the displacement component in the 1-direction. Note: Although u1, u2, u3, ur1, ur2, and ur3 are optional arguments, at least one of them must be specified. u2. A Float, a Complex, or a SymbolicConstant specifying the displacement component in the Abaqus ignores them. If your model is anything similar to figure 3.10 (your attachments), then the boundary conditions at the bottom edge are U1=0, U2=0 and U3=0 ( your Y axis is vertical). All

Antisymmetry about a plane with X = constant (U 2 = U 3 = UR 1 = 0; Abaqus/Standard only). YASYMM. Antisymmetry about a plane with Y = constant (U 1 = U 3 = UR 2 = 0; Abaqus/Standard only). ZASYMM. Antisymmetry about a plane with Z = constant (U 1 = U 2 = UR 3 = 0; Abaqus/Standard only). PINNED. Pinned (U 1 = U 2 = U 3 = 0). ENCASTRE

So if you define a cylindrical coordinate system, at a particular point U2 = tangential displacement, UR3 = rotation about local "z" axis (axis that runs throught the point of interest and is parallel to the cylindrical coordinate system axis). To edit an existing base motion boundary condition using menus or managers, see Editing step-dependent objects. In the Basic tab, select the Degree-of-freedom to specify the direction for which the base motion is being defined. This direction is always a global direction: U1, U2, U3, UR1, UR2, or UR3. ZU3Mc2i.
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    • abaqus u1 u2 u3 meaning