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  • Users: MrSamuel
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  1. MrSamuel

    'no compression' not available for truss in abaqus explicit. Alterative?

    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
  2. MrSamuel

    The soft tissue is connected to the

    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...
  3. MrSamuel

    too many increments, warped and distorted elements

    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"...
  4. MrSamuel

    Center of Contact Pressure, getting incorrect results, any ideas why?

    I am loading a model of a human foot onto a flat plate. There is frictional contact between the bottom surface of the foot's soft tissue and the plate. The foot is about 300mm long (oriented along x axis) and I would think center of pressure would be somewhere in the middle, maybe around 100mm...
  5. MrSamuel

    setting 'no compression' for truss element, causes abort... modeling ligament as tension only truss

    I am trying to model a ligament with a truss. To make it somewhat realistic, I need it to be tension only. The only way I have found to do this is to turn on "no compression" for its respective material. This causes my simulation to fail, giving me a bunch of the following errors: Solver...
  6. MrSamuel

    methods for constraining wire to solid object, selecting geometry?

    I need to constrain the end of a wire to a solid. I'm using coupling. Here are the two methods for specifying the geometry I have tried and their short comings: 1. First select the end node of the wire, then specify the closet element node on the solid(I had to create a set for that element...
  7. MrSamuel

    Modify FE Mesh by Editing CAE file directly?

    I need to do FEA on many similar organic parts. So rather than generating meshes and cae files for each of them, I would like to deform a master FE mesh to each of the parts. The deformation algorithms I have developed elsewhere, so no need for help on that. What I am hoping for is the ability...
  8. MrSamuel

    excessive distortion when the model has't deformed at all!

    I have a general static step that has a boundary condition that forces one body into another. One material is steel, the other is hyperelastic. The contact is frictionless. I get the error excessive distortion soon after they contact each other but before there is any significant deformation of...
  9. MrSamuel

    how to pretension a cable (set tension in truss prior to first step)?

    I finally figured out how to model a cable in Abaqus. Just use a truss and set the material properties to 'no compression'. Next I need to set it up so that the cable has a desired tension at the beginning of the first step (pretension). I know this could be worked around by making a first step...
  10. MrSamuel

    cable: tension only truss

    I would like to model a cable. I have heard a simple way to do this is as a tension only truss. I can model a truss, but how do I make it tension only? Thanks, Sam
  11. MrSamuel

    model tendon: tension only truss?

    I would like model a tendon pulling on bone. I have heard that a tension only truss is a good way to do this. But how can you set a up a truss to be tension only? Also, I am unsure how to connect a truss to an elastic body (bone). Any ideas? Thanks, Sam

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