Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations JAE on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Recent content by schopenhauer

  1. schopenhauer

    Some basic questions about composite design

    Hi, Recently I have been reading about the details of Puck's failure theory, and I reached a point where now I'm more confused than when I started, and some stuff that I thought I understood now is not so clear. So, I would like to share these basic questions to see if I can get a different...
  2. schopenhauer

    Abaqus - thick-walled pipe bending

    Hi, I was dealing with a very similar problem a few weeks ago, in my case, I was studying the behaviour of an orthotropic pipe under internal pressure (I was following Xia's paper, which is mentioned in Menshykova's). From my experience, I wrote the code in one go, as you probably know...
  3. schopenhauer

    Small pitch distances in composite joints

    A bit more in depth can be gained from a stress concentration analysis around the hole. I usually always plot the stress distribution around the hole, for that, you can use Lekhnitskii's equations. The maximum stress concentration factor depends on the laminate stacking sequence, for highly...
  4. schopenhauer

    Creep and fatigue properties

    Looking at the data in depth, there is some information in the "Misc. Tests" tab (stress rupture tests). It is difficult to complain about something that is free and public, but there is so much scatter in the data! I was hoping to be able to deduce some basic power-law function, but some data...
  5. schopenhauer

    Pid control on Abaqus model

    You may want to write the entire input file in Matlab, and control the variables from there (in fact, this can be done in any programming language). The easiest way is to create a similar input file with Abaqus/CAE, and generate only the changing code in Matlab/Python. Hope this helps.
  6. schopenhauer

    Creep and fatigue properties

    Thanks for your reply, very good piece of information. I also found a European database: "Fatigue of materials and components for wind turbine rotor blades", edited by C. W. Kensche (fewer samples but a more in-depth analysis). Still looking for something related to creep. Many thanks!
  7. schopenhauer

    Creep and fatigue properties

    Hi guys, Does anybody know a good source of creep and fatigue properties for carbon and glass composites? Preferably, at ply level, at different orientations and stress ratios. I've only been able to found information in some papers, but very dispersed and not of much engineering value. Many...
  8. schopenhauer

    alternative software to fibersim

    It is not free, but you may want to try Laminate Tools, it is cheaper than Fibersim (or Catia composites module): Link Unfortunately, I don't remember the exact price, but folks at support were really helpful.
  9. schopenhauer

    Abaqus script issue

    FEA way, Mustaine3, thank you very much for your quick answers. Indeed, the problem was the surface definition, a different method had to be used. If you use the *.rpy command starightaway, you will get the following command: side1Faces1 = s1.getSequenceFromMask(mask=('[#4 ]', ), ) Which is...
  10. schopenhauer

    Abaqus script issue

    Hello everybody, I have been doing so many simulations for pipes lately that I decided to create a very simple plugin for Abaqus to create 1/4 section models. I didn't have any experience or knowledge building scripts for Abaqus but with the manual, the *.rpy file and a bit of imagination I got...
  11. schopenhauer

    Whirling speed of a propeller shaft

    Hi Tmoose, thanks for your answer. The old design had a central bearing. The new shaft is going to be made out of carbon fibre, since the material is stiffer, we can go from end to end without a central bearing. My question regarding the rigidity of the "supports" was oriented from a beam...
  12. schopenhauer

    Whirling speed of a propeller shaft

    Hello everyone, I have been assigned the task of designing a propeller shaft for a truck, one of the requirements is to avoid the phenomenon of whirling. This is a new topic for me, so I will summarise what I believe I know until now: - At certain critical speeds, the elastic deflection of the...
See more

Part and Inventory Search

Back
Top