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  1. lavecchiasignora

    Read or Import a set of nodes

    Hi, I have a lot of node coordinates in a text file. Is it possible to read these coordinates in Patran in some way? Or do I need to specify each node manually?
  2. lavecchiasignora

    Maximum deflection aluminium

    Hi, I have a quadratic plate where the edges are fixed. I have a distributed load of 25000 N over the entire plate which is made of aluminium. How can I calculate the deflection of the plate? Thank you
  3. lavecchiasignora

    Lifting Analysis in Ansys

    Hello! I wish to do a lifting analysis in Ansys workbench. Basically it is a wagon with a train on it. I wish to analyse what happens to the model when lifting the wagon which has the weigth of the wagon+train. What is the easiest way to analyse what will happen to the wagon when lifting it...
  4. lavecchiasignora

    Vortex for PiP

    Hello What would be the difference when calculating VIV (vortex induced vibration) for a pipe-in-pipe instead of a single pipe? Should one look at the two pipes separately or not?
  5. lavecchiasignora

    415 or 450

    Hello Which DNV steel material is the best to use when doing FE analyses, is it SMYS 415 or SMYS 450? For the same strain then the stress will be higher in the pipeline and that is not good I guess? What are the advantages of 415/450? Im doing thermal expansion analyses and wondering how the...
  6. lavecchiasignora

    Angle for a node

    Hi, Not sure if this is the right forum but Ill give it a try. I have my pipeline configuration and all the nodes are given in global coordinates. I want to know the angle between my global X axis and the specific node. See my link for explanation. The red dot is the searched node angle. Do...
  7. lavecchiasignora

    Two equations Two unknowns

    Hello, I am a new Mathcad user and I am wondering: I have 2 equations and two unknowns. I want to keep the letters and symbols all the way in my calculations. epsilon_ys = A/E * [1+3/7*(A/R)^(n-1)] epsilon_ts = B/E * [1+3/7*(B/R)^(n-1) So I want to know how the equations looks like for n and...
  8. lavecchiasignora

    Stinger configuration

    Hello! I have a stinger configuration and I want to use the same stinger while I want to change the stinger radius. For example: My stinger configuration that is known has an radius of 150 m, and in addition to that I have all the roller positions relative to the hinge point. I now want to...
  9. lavecchiasignora

    Shell181 element in contact problems? Ansys

    Hi all I really need your help. Is it completely wrong to analyze a layered composite structure with the shell181 element if I should analyze the results in the contact area? I mean I cant get the stresses in the thickness direction but since I am using Tsai-Wu equation to predict failure that...
  10. lavecchiasignora

    symmetry question

    If I have contact between two bodies ( one structure and one sphere ) and Im taking advantage of symmetry in this problem. I set a displacement on the sphere so that it pushes the structure. If I use symmetry on my problem and only model half the structure and half the sphere, will I then only...
  11. lavecchiasignora

    Tsai-wu positive or negative?

    Hi all, When calculating the tsai-wu, shall the material strengths be all positive? I mean the compressive strength, should i use the positive value when I am calculating the Tsai-Wu failure criteria. And also, if the Tsai-Wu failure criteria is -50 for example, will it fail or will it just...
  12. lavecchiasignora

    Indentation depth in a laminate

    Hi all, Does anyone know a procedure to calculate the indentation depth of a laminate if a rigid sphere is traveling with a certain energy on the laminate? For example: A quadratic laminate made up of 12 layers [0/90]s and a steel ball is thrown at the laminate. How large will the indentation...
  13. lavecchiasignora

    BC's Acceleration Ansys Workbench

    I have a structure which is attached to slings (4 slings). The structure is then lifted through the slings. I apply an acceleration on the structure upwards in Ansys Workbench but I am not sure about the boundary conditions. Should the lifting holes ( all 4 of them ) be set to fixed support or...
  14. lavecchiasignora

    Maximum strain in Ansys

    Hi all, Is it possible to calculate maximum strain only in one direction? I think maximum strain considers every direction in a material but I only want to see if my laminate fails in the fiber direction. For example, I need to specify the strain strengths in all directions to be able to plt...
  15. lavecchiasignora

    Fiber direction in a structure

    Hi all, When I go to preprocessor > section > shell > lay-up i specify for exampel that my ply would have fibers in 45 degrees direction, BUT I dont know where that direction is on my structure. Is there any way that I can plot the fiber direction on my structure to see in which direction...
  16. lavecchiasignora

    Tsai-wu in 2D

    Hi all, Is there a way to plot the Tsai-Wu failure criteria in ansys APDL in 2D? When defining failure criteria I have to specify the strenghts in z-direction but since Im only working with shell elements consisting of layers of small thickneses I just want to calculate the Tsai-Wu in 2d and...
  17. lavecchiasignora

    pressure on a inclined surface

    Hi all! I have a ''wall'' which is 58 degrees from the horizontal plane and it is said that a force of 200kN shall be applied horizontally on that wall surface according to a standard, i.e. the force is in 0 degree direction and the wall is in 58 degree direction. My question is then if I want...
  18. lavecchiasignora

    Symmetry- stupid question

    Hi all, I have a structure and I only model half of the structure due to symmetry. The structure is exposed to an impact of an sphere in the middle of the structure, this is modeled by a prescribed displacement of the sphere. . Due to this I only model half the structure and half the rigid...
  19. lavecchiasignora

    Choice of failure criteria

    Hi all, Lets say there is a composite structure which is exposed of an impact of a sphere. Should I use the maximum strain criterion to see if the laminas will fail due to the impact of that sphere? And if I have the same structure but now the structure is loaded by a pressure over a large...
  20. lavecchiasignora

    Tensile and compressive strength

    Hi all, My question is how does the strength of a lamina in fiber direction affect the youngs modulus in the same fiber direction? If my youngs modulus in the fiber direction is reduced by a factor 2, how does that affect the strength in the fiber direction? thanks

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