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the material setting 'no compression' is not available in Abaqus explicit. I've been using the setting in Abaqus standard to model a cable in the form of a tension only truss. Is there an alternative way to create a tension only cable in abaqus explicit? Thanks, Sam

With your help I think I figured it out: pressure listed at a node is not necessarily acting on an area the size of the element; at the edges of the contact areas, it will inevitably be less. Thus I cannot simply multiply each pressure by the element area and sum them to get total force. Though...

OK, I think I've got all the techniques you've helped me with working individually, now I just need to put it together in one moodel. Already I can tell it will be a fast and robust model. Heres a question in a slightly different direction. Please let me know if I should create a new thread for...

Everything is great except for creating the bone to bone hinge and pin joints. I would really prefer not to work with the inp file as any changes to the cae file I make means I have to make changes to the inp file again. Just doesnt seem robust to me. And I'm having trouble tieing rotational...

To pick a node, I go to the mesh module, select the main part (merged ligaments, bone, and soft tissue), and create a set. I do this for two bones (I'm just making one pin connection for now). I then go to the interaction module and create an MPC constraint, select the first set (control node)...

Brilliant, I can see the bones now! I'm just about there. I just need to connect the bones. I'm doing it kinematically with pins and hinges rather than contact modeling (trying to make this thing fast). In the example of a hinge joint, I create two reference points. The first point lies...

The bone, soft tissue, and ligaments are one part. Its the bone and soft tissue being merged that is the problem. Once they are one part, I cannot isoloate the bone componement for visualization. And the surfaces of the bone don't exist anymore, only the surface of the soft tissue as the bones...

I'm having some luck merging the instances. A problem I am having is that I cannot see the bones in the visualization module (results) as they are a single part merged with the soft tissue. I need to be able to see the bones to inspect their relative movement. I've tried to use transparency, but...

How do I do this? In the assembly module using instance/merge? But then I cannot see the nodes because I'm not in the mesh module. Also, I've merged the bones with the soft tissue, so I can no longer distinguish between the bone mesh and the soft tissue mesh. If I decide to go the MPC tie...

I have been modeling the bones as solid as you suggested. I was using rigid body constraints on the bones as I don't need to see stress and deformation of the bones is negligible. However, I'm noticing the model is more efficient if I just leave the bones as deformable solids. Is this again...

I was able to use the body elements region type after I turned on "retain intersecting boundaries" when I merged the soft tissue and bone. I see MPCs for beams, ties, links and a few others, but nothing to do with transition zones. I do see a constraint for shell to solid, is that what you...

"You can assign a rigid body constraint to a section of a part." I've used the tie option in the rigid body constraint on each bone surface rather than selecting the entire bone body with the body option. I think this is what you meant. I merge the soft tissue with a bone and then mesh the...

I don't see that there is a way to use rigid body constraints only part of a merged part, so don't think that's an option for me. Turning off "adjust slave surface initial position" quadruples solution time, give or take an uple. As I understand, the function adjusts nodes that are tied by...

The bones are shells with rigid body constraints. I use the rigid body constraints to also pin the ligaments and fascia to the bones. If I merge the bones and soft tissue into one part, then I don't think I can apply rigid body constraints to the individual bones and then attach ligaments and...

The soft tissue was created by a boolean difference operation between the skin geometry and the bone geometry (boolean was done in Rhino3d). Thus the tied surfaces should be very close. But I don't think the nodes coincide. Merging would do this? How could I merge them? Turning off "adjust...

The soft tissue is connected to the bones with tie constraints. I'm having better luck getting it to solve when I turn off "adjust slave surface initial position". This to me suggests that the fragility of the model is in fact due to the warped elements. I will continue to improve the mesh...

Woops, that was supposed to be a response to another post, not a new post!

The soft tissue is connected to the bones with tie constraints. I'm having better luck getting it to solve when I turn off "adjust slave surface initial position". This to me suggests that the fragility of the model is in fact due to the warped elements. I will continue to improve the mesh...

I have a model of a human foot that consists of rigid bones kinematicaly connected and enveloped in linearly elastic soft tissue. Ligaments are approximated as tension only trusses. The model is finicky, slight changes can prevent the model from solving. I get the error "too many increments"...

refining the mesh a whole lot seems to be helping XN1 take on a more realistic value. Very odd seeing as the pressure distribution doesn't seem to change with refining the mesh, just the center of pressure calculation is no longer bogus... Sorry for the delayed post and thanks again for all the...