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  1. tld23

    FEA of fuel tank vibration with fuel in tank

    Hi Captain, I am not sure of the part and extent you want the fuel to take in the analysis. However a simple level you could represent the fuel load by a distributed pressure load that changes with fuel depth. This could represent the static load of the fuel. For bulk acceleration of the fuel an...
  2. tld23

    Spec a heat treat for a large aluminum weldment

    AS CWIC says you cannot get the material back to its initial state: 1) The parent material is in the T8x condition, which is solution heat treated, cold worked and then artifically aged. Near the welds this temper will be lost. After welding you could solution heat treat and artifically age...
  3. tld23

    FEA Sofware Reccomendation

    The choice of software should be driven by what you need to do with it. Look at typical jobs that you will need to analyse and draw up a list of things that you may need to include (e.g. contact, thermal, stress, vibration (type), 2D or 3D?) and how you want to use it (how often, in CAD, expert...
  4. tld23

    Is this standard business practice?

    As you were out of maintenance I think an admin fee is reasonable, but $2000 is way too high. I suspect this is a punitive measure to "encourage" you to go back on maintenance. Go back and talk to ANSYS, If it means loosing your 'potential' future custom I suspect they would wave or...
  5. tld23

    Coating Solid Mesh with plates for Stress Recovery.

    SeatrendSam Unless there is a specific requirement like that described by Mloew above I cannot see the logic in this technique. The accuracy depends on a number of factors, but I will limit discussion to mesh density issues. As the mesh is refined the solution variables should converge to the...
  6. tld23

    Book on finite element contact analysis

    chairats, I am assuming you want to know how to do contact analyses rather than learn about the programing. The following book is really about contact mechanics and is a good place to start: K L Johnson, 'Contact Mechanics', Cambridge University Press. Also NAFEMS (www.nafems.org) have...
  7. tld23

    3D solid in Abaqus

    Cristina I assume you are using ABAQUS/CAE for the input modelling. Unfortunatly CAE has quite poor facilities for directly creating complex surfaces. The only practical way of getting your data into CAE is to use a proper CAD package to define the surface as a NURB or as facets and then to...
  8. tld23

    Transient impact analysis using IDEAS, and in general.

    I am not sure about IDEAS, but it is probably an implicit code which is not good for capturing short duration events (it can do it but it will be very inefficient). LSDyna is a explicit code which should handle the impact event very well - that what explicit codes were designed for. This may...
  9. tld23

    FEM modelling of composites

    sgdon A lot will depend on the type of composite and what you are trying to find out. For instance: "A random nano-composite used to make a macro component and a you want to find the macro stresses could be analysed as a homogeneous isotropic solid." At the other end of the scale...
  10. tld23

    NAFEMS Registered Analysts

    Are there any NAFEMS registered Analysts out there? Apart from receiving the excellent Benchmark magazine, have you encountered any other benefits of this title? eg, in no particular order: 1) Promotion because you are an 'expert'. 2) Given as evidence of professional competence in biding...
  11. tld23

    Fast Conversion from Solids to Shells. A midsurface illusion?

    CADfix, I beleive has the most advanced mid-surface extraction reoutins, see: http://www.transcendata.com/products_cadfix.htm The software will also allow repair, defeaturing etc of the model. TERRY [pc2]
  12. tld23

    Failure point

    Dear elogesh, It is difficult to determin why there might me a difference between the Test and FEA without seeing the detail of what you have done. However consider the following: 1) Your model probably has isotropic homogenious material data. Castings are neither of these. Firstly it is not...
  13. tld23

    How to report true strain in IDEAS or other FEA programs

    * If you do a non-linear analysis you should get true strains. * A linear analysis will usually give engineering strains. Another important bit to remember is not the outputs but the inputs of the analysis. If you are doing a non-linear analysis the material properties input will ususlly need...
  14. tld23

    I am trying to model a beam on elas

    Are you sure you are taking the correct approach? Elastic foundations are often assumed to be semi-infinite half spaces. I am not sure if ANSYS assumes this? From your description your 'foundation' does not seem to be semi-infinite. In which case you will have to take into account the material...
  15. tld23

    Scared of anything not linear static

    trainguy Test, Test, Test - even if it is a scale physical model or a another simplification of the real structure. Of course you can do simple bounding calculations on many components that act non-linerly, although the bounds may be quite wide. There is no simple single answer, execpt that the...
  16. tld23

    Contact convergence

    krishna1, The reasion for non-convergance of contact are many. However many are solved or at least helped by trying a few simple things: 1) Make sure your master slave surface is the correct way around, make sure the larger elements are on the master surface or that any rigid surface is the...
  17. tld23

    Fatigue assessment and plasticity

    Corus, There are many of methods than can be used, at the extremes there are: 1) The psudo-elastic stress range method. Just use the strain range multiplied by the elastic modulus and then use this along with traditional S-N curves. Not very secentific but it does work (for steels at least). 2)...
  18. tld23

    Aluminium extrusion model.

    Most extrusion is relatively fast (~1m/s) and as such should be ameanable to a steady-state solution. I would suggest an Eulerian solution would be a good approach - this is one where the mesh remains fixed and the material moves through the mesh. A classical CFD mau do what you want but it will...
  19. tld23

    laser welded sst tubing

    Clee, The joint strength will depend on what is being measured. There are three main loading modes 1) Tension - pulling one tube out of the other 2) Torsion - twisting along the tube axis 3) Bending - loading normal to the tube axis You may want to assess all three modes or combinations of...
  20. tld23

    Torsional Moment in Reinf. Concrete Walls

    wutiger I am not familiar with STAAD, nor am I a structural engineer so my responses are based on 'common' sense engineering. Obviously if the torsional moment is great enough the structure WILL Fail. Concrete generally cracks due to direct tensile; the shear may increase the tensile stresses...

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