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Is there a way to determine how much time is required to solve a contact problem? Abaqus solved a similar problem with half the number of elements in 30 minutes but this analysis has been running for more than 3 hours now. According to the Data file, the memory to minimize I/O is 3141 but I...

Thanks a lot for your helpful comments. I appreciate it.

The model is not axisymmetric because the direction of loading is not. The only two options I can think of now is either to use a coarse 3D mesh with comparable values to the ones obtained in the 2D analysis or to use a fine mesh and ignore the peak stress values. Do you think this would work...

Corus, I followed your advice and worked on a simple 2D model that gave me max stress values that converged easily. Would it be safe to extrapolate from there to the 3D models (i.e use a mesh density that gives similar max stress values as in the 2D model)? I know for a fact that yielding will...

Thank you corus for your reply. I tried to look up similar problems in the forum and I read somewhere you saying that the stress values at the corners may be ignored since they are a result of singularities. Let's say I decide to do this and ignore those values, can I just look at the second...

I am sorry for not explaining this. I am not to concerned about the stresses around the threads since these are stress concentration areas and as I read in other posts the stress will keep increasing as I use finer elements. What I'm interested in is the max stress in the material around the...

Here's a screenshot of my mesh.I know it is very coarse, but when I use finer elements the stresses become unrealistically high. Any suggestions would be greatly appreciated! http://img689.imageshack.us/img689/3769/meshb.jpg

They do. it's a screw and the threads and tip are sharp. What do you suggest?

Hi, I'm working on a solid contact model involving sharp edges and small surfaces. I am trying to get my results to converge but I can't. I started with a coarse mesh (~8000 tetrahedral quad elements) and refined the mesh by using smaller global seeds in the area of interest while maintaining...

What about kinematic coupling? should I restrain any dofs if I want the force transmitted directly to the scew? Thanks for your help

Please bear with me... I'm a newbie What I'm trying to do is to apply a load to the screw which is placed in a block that does not move and then see how much stress is generated in the block. Technically the screw should be able to move in any direction while the block is fixed. Initially when...

The first picture shows the assembly. I set the BCs as follows: X-SYMM on surfaces orthogonal to x-axis (2 surfaces) Z-SYMM on surfaces orthogonal to y-axis (2 surfaces) Y-SYMM on bottom surface Zero displacement in all dofs except U1 for reference point on screw head As for the kinematic...

Hi, I am working on a model of a 3D screw in a cubic block and I want to make sure it is done properly. I wish to apply a force in the U1 direction so I created a reference point on the screw heard surface and used Kinematic Coupling to tie it to the surface. I only checked U1 because this is...