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  • Users: SteveFinnan
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  1. SteveFinnan

    How to define bilinear elastic-plastic material in Abaqus?

    I'm having problem to define the bilinear elastic-plastic material. I have the following information. density = 7800 kg/m^3 Young Modulus = 193 GPa Yield strength = 207 MPa Poisson's ratio = 0.27 Tangent Modulus = 692 MPa Shear Modulus = 75 MPa I already ran the first simulation, but the...
  2. SteveFinnan

    What is the typical bending stiffness and torsional stiffness of a chassis of hatchback car?

    I know there are lots of factors come into play when determine the bending stiffness. I am more concerned about the material and the design. I'm using high carbon steel as the material. The density is 7490kg/m^3, Young Modulus=198000 MPa, and Poission's ratio=0.29. I modeled the frames of...
  3. SteveFinnan

    How to apply pressure of 0 to 0.409 MPa at constant for a time from t=0 to t=1.6ms?

    @DanStro, Do you mind explain a little bit more? By amplitude, I assume this is the fatigue analysis.
  4. SteveFinnan

    How to apply pressure of 0 to 0.409 MPa at constant for a time from t=0 to t=1.6ms?

    I don't really get this. I have a balloon and stent, and I need to apply an internal pressure on the inner surface of balloon. The balloon will expand, then the stent will expand as well. However, when I review work done by other, I came up with this statement. "As illustrated in Fig. 2...
  5. SteveFinnan

    Does the blood flow (fluid mechanics point of view) has any effect on the failure of stent?

    Thanks for your reply. But how am I going to convince my supervisor that the flow does not influence the mechanical failure of stent? He keeps on asking me to find something relating each other. DAMN!!!! I cannot find a damn article that can relate it. He asking me to find something like...
  6. SteveFinnan

    Does the blood flow (fluid mechanics point of view) has any effect on the failure of stent?

    So far I have search, the reason for failure of stent does not come from blood flow in artery. The most common reason is the fatigue failure, due to the cyclic loadings of the of the pulsatile blood pressure (solid mechanics point of view). I want to know if the from the fluid mechanics point...
  7. SteveFinnan

    How to apply uniform pressure on inner wall of a cylinder?

    You can see a list of pressure to choose from. However, there is no the pressure that I want!!!!http://files.engineering.com/getfile.aspx?folder=bbbd0838-bc37-40d1-a682-5eaf84b924b7&file=!.jpg
  8. SteveFinnan

    How to apply radial load in cylindrical object?

    @Drej Trust me, I would not have to take all the trouble and post a new thread if I know the solution. And no, Ansys Mechanical does not assume that the pressure is distributed uniformly throughout the circular wall of cylinder. ANsys Mechanical will assume that it is a point load. Not a...
  9. SteveFinnan

    How to apply uniform pressure on inner wall of a cylinder?

    And of course the pressure where I want to it to act on the inner wall of cylinder. http://www.cfd-online.com/Forums/attachments/structural-mechanics/26406-ansys-mechanical-14-0-axi-symmetric-condition-ansys-mechanical-main5x.png
  10. SteveFinnan

    How to apply uniform pressure on inner wall of a cylinder?

    File name "Capture"http://files.engineering.com/getfile.aspx?folder=0e0f650f-cfb8-491d-99ce-e00527aec6a9&file=Capture.JPG
  11. SteveFinnan

    How to apply uniform pressure on inner wall of a cylinder?

    I have a hollow cylindrical object. I want to apply a pressure acting on the inner cylinder wall, which is circle in geometry of course. Then I would like to view the expansion of the cylinder object, due to the pressure acting on it. Please refer to the link, under the post of flash3780. The...
  12. SteveFinnan

    How to apply radial load in cylindrical object?

    Aarrggh... It is not radial load. Mistake. What I mean is the load acting on the inner surface on the cylindrical object (balloon catheter). Each point on the inner surface of the balloon should have the same load acting on it.
  13. SteveFinnan

    How to apply radial load in cylindrical object?

    Please refer to the link under attachment, that's my model (using Solidworks). This is regarding my final year project. Load analysis on stent. I want to apply a radial load onto the inner surface of the balloon, so that the balloon will expand, which in turn will expand my stent. I'm using...
  14. SteveFinnan

    Coronary stent: How to model it in Femap Nastran?

    Can I model it using line element, beam element, or plate element? So this is my final year project. I have to do analysis on the load distribution of the coronary stent. I need to make sure which element will give the most accurate result. If I import the CAD model from Solidworks, which...
  15. SteveFinnan

    ANSYS Fluent 14.0, dimension problem?

    http://www.flickr.com/photos/52175884@N08/9039215626/ Why I cannot display the value of dimension in my sketching? You can clearly see that my vertical dimension is 16.25 in, and my horizontal dimension is 7.07 in, but the values in the sketching is weird? And the triad is supposed to be X, Y...
  16. SteveFinnan

    Use a safety factor of 1.5, can the s.f that i calculated equal to the s.f given?

    the value of yield strength/design load is equal to the safety factor given. Is it safe or yield? I need to consider the weight of the whole structure as well. If i use bigger dimension, it is of course more safer, but the weight will increase as well. So, can the safety factor calculated...
  17. SteveFinnan

    Von Mises stress and safety factor?

    In FEMAP, i obtain the max stress of Bar EndA and Bar EndB. Then from there i calculate the von mises stress using the von mises yield equation, (σa)^2 - (σa)(σb) + (σb)^2 = (σv)^2 where σv = von mises stress Let's say after my analysis, I get σv = 208MPa Given the yield strength is 210MPa...
  18. SteveFinnan

    FEMAP: Constraint in sliding boundary condition and ball-joint boundary condition?

    your answer don't convince me much but thanks..
  19. SteveFinnan

    FEMAP: Constraint in sliding boundary condition and ball-joint boundary condition?

    sorry, i'm a bit slow. From the ball-joint boundary conditions, you said it should constraint the 3 translational motion, and uncheck the rotational motion because it is free to rotate in the 3 axes(x, y and z). There's no translational motion. But sliding boundary conditions, the rear wheel...
  20. SteveFinnan

    FEMAP: Constraint in sliding boundary condition and ball-joint boundary condition?

    Thanks for the reply. The rear wheel of bicycle is sliding in the x-axis only. So, i should let x-axis free to move (TX uncheck), and check the y and z translational, as well as the 3 rotational?

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