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Recent content by xlxc34

  1. xlxc34

    ABAQUS "Free Body Cut" functionality in ANSYS

    Hi, Is there a function in ANSYS which can recreate the ABAQUS 'free body cut' behaviour? It lets you take a slice through the model and obtain the forces and moments acting about a point in the sliced cross section. I need it to check that a shell model of a wind turbine blade is seeing the...
  2. xlxc34

    Control design for finite element model

    I am coding up a non-linear dynamic simulation of some wind turbine blade test equipment. The blade is cantilevered from a mounting structure and fatigue tested by reciprocating a large mass that is mounted to the blade at the resonant frequency of the system. The blade and its mounting...
  3. xlxc34

    Thrust bearing design

    Thanks caoimhin1, that's very useful. Do you have a very rough idea what kind of Hertzian contact stress would be allowable? This is just for future reference, as I think I'm going to take your advice and try to have a more major design rework to eliminate the need for a thrust bearing in the...
  4. xlxc34

    Thrust bearing design

    Hi Everyone, I'm working on a BMX bicycle hub, and space is at a premium to say the least. This is because the design of the hub means that the bearings must be fitted underneath the driving sprocket, which has 9 teeth and is designed for a chain with a 1/2" pitch. This effectively places an...
  5. xlxc34

    Abaqus input file format question

    Hi All, I'm writing a MatLab script to read the Abaqus input file for a shell element model of a wind turbine blade and output its beam properties at various points along its length. The input file contains various data that spread across two lines, such as elastic properties for materials...
  6. xlxc34

    Signed effective stress

    Thanks, I've actually decided to use the signed von mises stress (I found it on the fatigue part of the Ansys website). In Excel code: SignedVM=if(abs(Sig1)>abs(Sig3),sign(Sig1),sign(Sig3))*VM You're right about the energy in the stress strain curve, the original formula in my first post is...
  7. xlxc34

    Signed effective stress

    Hi, I'm developing an in house code for analysing polymers. The algorithm I'm using to check when failure will occur is temperature dependent, so we need a formula for calculating how much the temperature will rise due to stress cycling. I've found the formula...
  8. xlxc34

    Abaqus shell element model - extract beam section properties

    I never found out how to do this in Abaqus I'm afraid... I ended up writing a MATLAB code based on stuff in this book...
  9. xlxc34

    View layer results in composite - Abaqus

    Hi, Does anyone know how to view the stresses in different layers of a composite in Abaqus/Visualisation? At the moment I can only view the results in the top layer of the stack. I have outputted stresses at all levels in the laminate. Thanks, Pete
  10. xlxc34

    Composite shell element outputs in Abaqus

    Hi, I have a shell element model of a wind turbine blade in Abaqus. The company I'm doing the work for uses an in house mesh generator to build the model from information about the exterior surface of the blade and the lay ups, which I believe interfaces with PATRAN. I'm using Abaqus/CAE, so...
  11. xlxc34

    Abaqus shell element model - extract beam section properties

    corus, I need the beam elements as shell elements cannot be used as an input to the wind turbine simulation tool I am using. loki3000, How would I work this out with scripting? And I am based in the UK.
  12. xlxc34

    Abaqus shell element model - extract beam section properties

    Hi Mark, Thanks for that, it's definitely an idea. I'm not sure if Abaqus can display shell thicknesses... I haven't found it yet if it can(still very much a novice). However I do know them so I could get the beam properties by doing something like what you suggest. The only problem I can...
  13. xlxc34

    Abaqus shell element model - extract beam section properties

    Hi Mark, That's exactly right. At the moment I have the .inp file (the company I'm working with uses Patran) but I could probably get a hold of the CAD model if necessary - although I have no idea how a CAD model of a composite structure manifests itself; is it just a surface with layup...
  14. xlxc34

    Abaqus shell element model - extract beam section properties

    Hi, I have modelled a wind turbine blade in Abaqus/CAE. It is made from a variety of different composite lay ups, so I have used composite shell elements to model it. I have some wind turbine specific simulation software, but it requires beam section properties (bending stiffnesses, shear...
  15. xlxc34

    beam element loads to full shell element model

    hi, i'm working on modelling a wind turbine blade. I have loads derived from wind turbine simulation software which utilises a beam element model of the blade. This is in the form of a time history of the axial force, torsion moment, and a 2 bending moment and shear forces. I have built a full...
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