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  1. RvL04

    [b] Friction COefficients [/b]

    ariky; I'd be careful using values from a published table. There's so many things that come into play with friction between those two metals (surface finish, normal pressure, other conditions) that any kind of 'general' table is, in my experience, usually way off. A good paper (pdf) on these...
  2. RvL04

    Creep Coefficients for Teflon (for FEA Analysis)

    g1a1, be careful with using some of those 'published' values; as Demon3 indicated in his first response they may not all refer to the same thing. What's to stop you from actaully getting your seal tested? I know there's lots of great labs out there (e.g. Axel) that would be happy to do a creep...
  3. RvL04

    reliability of FEA stresses with out testing.

    I too could not agree more with GBor. I've worked with a wide range of material test data, some good, some bad. I was in the fortunate position of being able to use both material test data to build my model as well as component test data for model verification purposes. A good analyst /...
  4. RvL04

    Alloy 715 finish

    By the way, I know of a variety of means to do this on steel (milling, drilling, sawing, chemical milling, forging), but I mainly need to know whether it can be done on this particular alloy. Thanks!
  5. RvL04

    Alloy 715 finish

    Hi; I have almost no experience with material finishes on metal. Our customer needs a finish of 125 microinches (or better) on Alloy 715. This is a 70-30 Copper-Nickel alloy. Does anyone know if that alloy can get that finish, and if so, by what method(s)? Finally, does anyone know any...
  6. RvL04

    patentable tire idea?

    Well, considering that note from Goodyear, I'd definitely agree with Greg: get it published, so others can do the legwork for putting it into practice (and besidsed, others will have a hard time obtaining any kind of intellectual property protection if the idea was previously published by you). Ron
  7. RvL04

    Isotropic properties of Glass fibres

    izax1; I would suggest you get the glass fibers tested; I've seen several cases in the past that were clearly orthotropic, oddly enough... I'm no materials guy, so I'm hesitant to make any type of generalization, but rather, get the results to look at... Ron
  8. RvL04

    Rubber FEA

    EcoMan; Re. 1: I would suggest using bulk modulus and young's modulus. Re. 2: I couldn't agree more with your question, and think that jgough was seriously oversimplifying things... Ron
  9. RvL04

    Moony-Rivlin Constants

    well, that' doesn't surprise me, baris, because like I said, published data lists make my skin itch... they're fine if you want to use them to get some general idea of the material properties, but if you are using data to build a model, it simply isn't good enough. Especially if the data is only...
  10. RvL04

    Poisson's Ratio

    Hi! I'm pretty much new to metals. We had two materials that we had tested in a quasi-static tensile test. The axial strain results look fine, but the transverse strain results, I'm having some trouble interpreting. The first material decreased in thickness by 11% (before the test vs. after...
  11. RvL04

    z direction(out of plane)properties for composites

    Hi Alleak; Why don't you get your materials tested? You can get the material results in all directions you need. Some materials testing labs (like www.axelproducts.com) can help you out with that quite easily! Ron
  12. RvL04

    Youngs Modulus Of High Impact Polystyerene

    Krunal; Perhaps a silly question, but why don't you just get your actual material tested? I know it costs a few $$, but that will get you by far the most accurate values. I agree completely with Demon3's first reply here in that one formulation varies greatly from the next. That alone is enough...
  13. RvL04

    Dynamic Load Analysis on Truck Mounted Structures

    Mrsteam; Contract test labs like Axel Products can perform the basic analysis. (e.g.: http://www.axelproducts.com/downloads/DynamicTest.pdf ) FEA support groups like that of ABAQUS Great Lakes can perform the FEA for you. Try contacting todATabaqusDOTcom (a guy named Tod Dalrymple, very...
  14. RvL04

    Zero Displacement

    Not sure, have never encountered this. Try decimating your data. Ron
  15. RvL04

    failure for hyperelastic material

    Hi jisb007; Failure in hyperelastic testing is pretty straightforward: In uniaxial (simple) tension, it is the breaking of the specimen. In pure shear (planar tension), it often is also the breaking of the specimen, HOWEVER, the specimen will typically break at the grips. An additional...
  16. RvL04

    Vibration Fatigue Analysis using MSC-Fatigue

    Laxman; I'd suggest a dynamic test (storage and loss modulus), I think MSC prefers a test like this one: http://www.axelproducts.com/downloads/DynamicTest.pdf Not sure I helped much, but check it out nonetheless, it might give you some new ideas! Ron
  17. RvL04

    Comparing FEA results to experimental results

    EngForm78; What's your material? If you're talking plastics, fine, but if you're talking elastomers, 'yield' is a word I'd try to avoid at all cost! On top of that, what state of strain are we talking about here? If we're talking about a uniaxial 'simple' tension state, failure should, in...
  18. RvL04

    Explain/Clarify Planar Shear Elastomer Specimen Test?

    Hi cnuk; I've been browsing around on Axel's web site; their 10th paper on the site (under technical downloads) is a long paper by MSC Software, that discusses all basic tests needed in an FEA. On page 50, they explain the idea behind the planar tension test; does that help? I think there are...
  19. RvL04

    rubber insulator

    Autoguru; Considering your initial question: the piece of 'something' you want to place in between these metal rods, is it going to be constrained, or do the sides have an opportunity to 'bulge out', if you will? Do you want to adhere it to one of the rods (so there is rubber on metal friction...
  20. RvL04

    305 Stainless Steel - or something like it...

    Hi; I need to have a part machined out of a steel that's close to 305 Stainless Steel. Our supplier tells me 305 is going to be really expensive (it's apparently not that common), but our customer wants something a lot like it. Now, I'm no chemist and don't work with metals a lot at all. Can...

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