Simple 3D tensile test

[MBrown]

Hello everyone,

I'm trying to model a simple tensile test in 3d on a rectangular specimen. I seem to be able to generate a mesh, and upon running the file I see that my time steps count through, but I see nothing change on the mesh plot, and I don't get any output data. I've used the batch solution for multiple 2D models with good result, so I'm unsure where I'm going wrong. My method is to simply set one end as stationary and the other will be displaced some tiny distance every time step. I've attached the input and input file below. Any help or hint is appreciated.

Thanks,
Michael

[Prof. R.L. Taylor]

Looks like your boundary condition is wrong where you want to apploy the displacements

[MBrown]

My apologies. I feel ridiculous. For some reason it completely slipped my mind that the boundary needs to be non zero to define displacement. Thank you very much.

I do have one further question if you don't mind...

I would like to simulate a tensile test of a specimen with strips on the edge that reinforce it. The strips are bonded to the specimen, and they have a bond strength past which the strips will delaminate from the specimen. Would you be able to point me in the direction of the correct way to pair the two materials so I may simulate this bond? I've been able to implement pairs in 2D. Is pairing surfaces in 3D the same basic idea?

Thanks again,
-Michael

[Prof. R.L. Taylor]

I am not clear on how you paired the 2-d, but basically there should be similar options in 3-d.  If you users "adhesion" to allow tension then I do not know if the 3-d has it, but we can work together to add it if it is not there.  Otherwise let me know how you did the "pair" option in 2-d