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  1. halston

    Hole internal torsion by applying rotation to one edge of hole

    I've already done that. But the problem is that the kind of torsion I'm dealing with is not uniform along the axis of the hole. I want to find the torsional stiffness of the specimen with this specific type of torsion which has a gradient along the axis of the hole and I don't know the correct...
  2. halston

    Hole internal torsion by applying rotation to one edge of hole

    Hi thanks for your response. I'm applying torsion in U2 direction in a cylindrical coordinate system which represents Theta and that's the direction that torsion should be applied! Do you think it should be in another direction?
  3. halston

    Hole internal torsion by applying rotation to one edge of hole

    I'm trying to model some sort of internal torsion by applying rotational displacement to one edge of a hole in the middle of a disk-shaped specimen. After getting the result, I see that only displaced nodes have non-zero displacement(equal to the applied displacement) values and all the other...
  4. halston

    Contact modeeling

    Can you please explain the relationship between the centerBC and slippage between the mandrel and the specimen surfaces? I can't understand that!
  5. halston

    Contact modeeling

    I will attach them in two different steps and there is no need for winzip or winrar. Here is the .cae file.http://files.engineering.com/getfile.aspx?folder=712a45f4-b037-43bf-a849-89571617e171&file=Model-10.cae
  6. halston

    Contact modeeling

    Attached you can find my files. Please have a look and let me know how I can improve it. Thanks a lot!http://files.engineering.com/getfile.aspx?folder=e16d2cad-d59e-4926-8866-42b820fcb400&file=ABAQUS_Model.rar
  7. halston

    Contact modeeling

    Yes, I do. I have defined isotropic friction with friction coefficient of 0.1.
  8. halston

    Contact modeeling

    I checked my model again and I found the problem. Everything was ok, I just needed to remove the mandrel instance in the visualization module in order to see the correct stress distribution in the specimen. But now I have another problem. I need to model slip between the mandrel and the specimen...
  9. halston

    Contact modeeling

    Hi Rob, Thanks for your reply. I tried to remove aoverclosure by toggling on the "Adjust only to remove overclosure" in edit interaction dialog box. But it didn't work and I still get almost the same stress distribution in the specimen. Is it the right way to remove overclosure? As you said...
  10. halston

    Contact modeeling

    Hi all, I am modeling an insertion of a solid pin to a mandrel-specimen assembly. specimen has a central hole and mandrel is inside the hole. Pin will be pushed down in the hole which is drilled in the mandrel. I've defined two pairs of contacts, pin-mandrel and mandrel-specimen. I've used both...
  11. halston

    hollow cylinder torsion modelling in ABAQUS by rotational displacement

    Oh sorry, this what it shows in the input file: *Cload _PickedSet18, 5, 0. _PickedSet18, 6, 100000
  12. halston

    hollow cylinder torsion modelling in ABAQUS by rotational displacement

    I'm applying the moment to DOF 6 (CM3)in moment type edit load dialog box. It's weird! This is what is shows in the input file: *Cload _PickedSet22, 5, 100000. Why is it 5?
  13. halston

    hollow cylinder torsion modelling in ABAQUS by rotational displacement

    Thank you for your instructions. In my kinematic coupling constraint if I constraint all degrees of freedom, then it works very well, but when I just constrain UR3 (as you said), it doesn't work (it is for the case that I'm applying rotational displacement). On the other hand, to get my model...
  14. halston

    hollow cylinder torsion modelling in ABAQUS by rotational displacement

    This is the .jnl file of the model!http://files.engineering.com/getfile.aspx?folder=98658e4e-3088-4b4f-be7a-a2d892da4c8f&file=Solid_Cylinder_torsion.jnl
  15. halston

    hollow cylinder torsion modelling in ABAQUS by rotational displacement

    Ok I'll try to do it. http://files.engineering.com/getfile.aspx?folder=06ab7b4f-34ce-48b1-b180-f5ee65a0902f&file=Solid_Cylinder_torsion.cae
  16. halston

    hollow cylinder torsion modelling in ABAQUS by rotational displacement

    How can I create a rigid plate and tie it to the end of the cylinder? I've attached the file to this message. Please have a look and see if you can possibly help me.http://files.engineering.com/getfile.aspx?folder=4a322aa9-8f36-4b18-a978-d4ab385f802e&file=Soild_Cylinder_Torsion.rar
  17. halston

    hollow cylinder torsion modelling in ABAQUS by rotational displacement

    Thank you all for your replies. The unit of rotation in Abaqus is radians. So when I apply 1 degree of rotation I convert it to radian (0.0174) and then I enter it in ABAQUS. I do the coupling for all 6 degrees of freedom between the RF and the surface. When I apply a moment(100 Nm) the Von...
  18. halston

    hollow cylinder torsion modelling in ABAQUS by rotational displacement

    Hi, I am trying to solve a simple hollow cylinder torsion problem in ABAQUS 6.7. Instead of applying a moment I'd like to apply the angle of rotation as a boundary condition to the surface at one end and get the resultant stresses. I first defined a reference point and then a coupling...

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