Circular displacement in abaqus

[darinj]

Geometry - see image:

http://www.mathalino.com/sites/defa...0-fbd-pressure-cylinder-tangential-stress.gif

The material is an elastomer, it has metal plates on both sides in the assembly, however I have modeled only the elastomer and have put an encastre boundary condition on the outer face - the orientation is such that the the plane in the picture would be horizontal instead of vertical so it was be a semi-circle that looks like a 'u'.

There needs to be an initiall pre-stress that causes a 3 mm displacement over the circular inner face, how do I do that? I have created a circular datum axis, but directions would be helpful. I am new to abaqus, teaching myself (and now with your help!!). Thanks. (I only have the ability to add displacements in the direction of the axes, and I get errors when I try to select displacement in all 3 directions even w the bottom face w encastre).

 

[Mustaine3]

In a cylindrical CSYS DOF1 is the radial direction and 3 is the axial direction. 2 ist the tangent direction at each node, which is usually useless, because it is different at each node and is not updated during simulation.

 

[darinj]

I created the cylindrical axis and it was giving me errors. I ignored the preload and just did cyclic loading and got very strange results. For the model described, do you think an evenly applied pressure over the curved face is the best load method for the periodic loading, or should I apply an evenly distributed downward force over the face, or perhaps a concentrated force in the center?

Remember its an assembly essentially an outer metal cylinder (with inner and outer radius), its bonded to an elastomeric cylinder on the inside, and the inner radius of the elastomer is bonded to another metal cylinder. In the middle there is a cylinder of metal (a pin) that is solid. The load is applied from torque over a torque arm, so its being interpreted as a force on the top of the assembly.

 

[IceBreakerSours]

You have to a create a cylindrical local coordinate system, and then, when you are specifying your BCs or loads, you must choose that local coordinate system in the boundary condition or load dialog box.

*********************************************************
Are you new to this forum? If so, please read these FAQs:

http://www.eng-tips.com/faqs.cfm?fid=376

http://www.eng-tips.com/faqs.cfm?fid=1083