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Recent content by Timusop

  1. Timusop

    Contact and sub surface stress calculations

    Thanks dhengr, My post a few weeks ago was regarding the relationship between contact pressure and friction. http://www.eng-tips.com/viewthread.cfm?qid=311294 They are different questions, but you are right the answers are available in the same places. With regards to the software, I fully...
  2. Timusop

    Drawing 3D geometry in Abaqus CAE/Command

    It may be better and easier to model the part in a CAD package, like Solidworks/Autodesk/ProE and then import the model into an FEA package.
  3. Timusop

    Contact and sub surface stress calculations

    Thanks saplanti, but I couldn't find the background calculations behind this software from the link?
  4. Timusop

    Contact and sub surface stress calculations

    Thanks for your help and suggestions. It seems that Timoshenko covers it, but Roarks only deals with the surface contact pressures, not the sub surface stress and shears. I hope the Timoshenko can provide what I need. Thanks again.
  5. Timusop

    Contact and sub surface stress calculations

    Does anyone know where I can find the equations used behind these calculations: http://www.mesys.ch/calc/hertz.fcgi I am particularly interested in calculating the subsurface stresses and shear stresses in the x,y,z directions.
  6. Timusop

    Different properties of outer elements

    Thanks MechIrl, Your suggestion has got me thinking some more... Could I define the outer elements to be a certain depth? This might be a more difficult if the elements not hex or if there are some tricky radius bends. I may have to model the two sections seperately and then tie them together...
  7. Timusop

    Different properties of outer elements

    I have some complex bone geometry in Abaqus, is there any way of defining the elements associated with the outer surface to have one set of material properties and the rest of the internal elements to have another set of material properties. Another way of doing this maybe to have the first 1mm...
  8. Timusop

    Relationship between contact pressure and friction

    Thanks everyone, rb1957, I mean CoF, i.e. One thing I do know is that the surface and sub surface contact stress becomes very important when the CoF is above 0.3. I wondered if anyone knew more about this. I will also go through your suggestions on literature. Thanks again.
  9. Timusop

    Relationship between contact pressure and friction

    Hello all, I am wondering if there is a relationship between friction and Hertz contact pressure defined somewhere. I just can't seem to find it. I could use FE to determine this, but didn't want to waste time if its already been done. Thanks.
  10. Timusop

    Statistical software for Engineers

    Yes I agree, both Smath Studio and MathCAD can not match Excel in its graphing capabilities, but then again I don't think it's meant to. As always, we need more than one tool for the job. Thanks.
  11. Timusop

    Abaqus API

    Hello all, 1) Does anyone know if and where I can get hold of the Abaqus API (Application programming interface) for Fortran. Someone suggested this may help me solve some uninitialized memory read problems that I am having with my subroutines. 2) Does anyone use any good debuggers for helping...
  12. Timusop

    Statistical software for Engineers

    Thanks everyone, I ended up using Excel to do this task. I really appreciate your input.
  13. Timusop

    Understanding where data in subroutine is extracted from

    Has anyone got any ideas on this. I have been stuck on this for ages now. Really need some help please, (see part of the code below). DIMENSION ARRAY(1000) CALL GETVRMAVGATNODE(LOCNUM,JTYP,'CSTRESS',ARRAY,JRCD, $ JELEMLIST,NELEMS,JMATYP,JGVBLOCK) C CPRESS =...
  14. Timusop

    excessive distortion when the model has't deformed at all!

    If you are using Abaqus Standard, try "nudging" the parts together using displacement control before switching to force control. This normally solves this problem. I hope that helps.
  15. Timusop

    Statistical software for Engineers

    Thanks IRStuff, It seems that the software is not compatible with the Windows 64bit OS. Is there any alternatives. I wanted to be able to plot statistical graphs, e.g. normal distribution, etc easily without having to type PDF formulas etc. Hope that makes sense. Thanks again.
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