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Found 10 results

  1. I am trying to squeeze a femur model with two sets of stiff springs top and bottom, and allow it to rotate with the other (spring BCs come from a research paper). Instead, the model bends where the mesh meets the springs that should remain mostly straight. However, I have tried adjusting all DOF stiffnesses in the PBUSH card without luck. All springs have been assigned to the local coordinate system (shown in right on photos) using CBUSH card. It seems to me I need to stiffen K2 or K6 (y-tension, z-moment), but neither of these solves the issue. Attached graphs show "TY" stresses. Femur_Model_6_26.fem
  2. Hi, Instead of rubber bellows I have used Cbush element and given stiffness to it. I want to give preload also. I have checked we cannot give preload to cbush element. CROD,CBAR,CBEAM support for giving preload. Is there any option (spring type) to give preload and stiffness to 1D element simultaneously ? Please let me know soon. Regards, Pratik
  3. How to conduct Non-linear Modal analysis ?
  4. Hey everybody! I've just tried HyperLaminate modul in HyperMesh and found that it can calculate the stiffness of a composite laminate, the [A] [D] matrices etc. as you can see on the attached images. Is there any tool which represent the stiffness of the laminate in polar chart? I think Ansys is capable of doing it, but I could not find this function in HyperWorks. Thank you for your answers! Kind regards, Imre
  5. Hello everybody, i guess it is easy to solve but i can't define the stiffness of a celas2-element. I created 1D --> springs --> celas2, Chose 2 nodes, Chose dof (3), Chose property, but still i don't know how to apply the stiffness (K). It tried with PARAM --> ELASSTIF, but it doesn't work. Thank you in advance Greets, Fatih Uysal
  6. Is it possible to conduct Operational Modal Analysis (OMA) in Optistruct ?
  7. Hello there, I need some advice for defining the stiffness of a spring damper element with a curve. My task is to model a 1 mass oscillator with a non-linear stiffness. But first of all I want to understand how to define a stiffness through a curve. So I tried to model a linear stiffness through the curve and verify it with the regular linear simulation. My questions are: Can anybody tell me what I have done wrong with my curve definition? I defined a sinusodial force with +/- 10kN but the mass is just swinging in the negative area? Can anybody specify what the independent variable is? What do I have to put there when my curve is defined as force over displacement? I have attached my files. I appreciate every help
  8. For Modal and Stiffness(torsional and bending) of ladder frame chassis, is there any significant difference in results when I use stick contact between frame and cross-members or when I use shell/rigid weld elements to connect cross-members and long members?
  9. Hello, If I am to put RBE3 in a hole (with no force or constraint attached to the dependant node) will this imply any stiffness to the voids outer surface where the independent nodes are? Or does the hole just remain as it would if it was a void with nothing in it? What type of 1D element could be used to provide a defined stiffness to the outer surface of a hole? Thank you in advance
  10. Is it possible to calculate the Stiffness (N/m or N/mm) of the structure from any analysis??
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