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  1. mfinke

    SN curve for gray cast iron

    Dear all, i´m looking for a SN - curve for the following material: DIN: 0.6035 UNS: F13801 ASTM/AISI: A48, class 55B UK: Grade 350 thank you in advance regards Matthias
  2. mfinke

    fatigue, frequnecy and cycles

    Dear all, does anybody knows the depemdency between load frequency, load cycles and fatigue strenght. I known that beyond approximately 10^2 load cycles we are talking about fatigue, but whats about the frequency. Is 1 cycle per hour or day enough to have fatigue effects in metals? regards...
  3. mfinke

    magnetic properties

    Dear all, i looking for a source where i could find magnetic properties (espacially B-H curves) of different steels and other materials. For design improvement we need to know the beginning slope and the hysteresis. best regards, MAtthias
  4. mfinke

    von Mises stress with algebraic sign

    Dear all, for a part under triaxial stress condition i´d like to do a fatigue life estimation. From a FE analysis i got the von Mises stresses (to compare uniaxial material props with triaxial stress in part) material assumed to be ductile. ( so yield in tension and compression should be...
  5. mfinke

    formulas for deflection line

    Dear all, does somebody knows a location in the web where i can find formulas for the bending line of discs etc. .Something like ROARK´s formulas for stress & strain but on the web. regards MAtthias
  6. mfinke

    inteference fit

    Hi daveleo, i have found in the forth edition from 1965 in table XIII case 11 something similar to my problem, but this formulas are for thin vessels. The tube i´m analyzing is thick. D=6mm; d=4mm. In this formula there is used lambda. What is this and how can i calculate it or find it...
  7. mfinke

    inteference fit

    Dear all, i´m doing a analysis of a pressure resistant small tube under a bending moment. In our first design the part looks like a hollow bolt. The head of this "bolt" was pressed in another part. When now applying a bending moment to the other end the hghest stress region is the radius...
  8. mfinke

    Checking the FEA quality

    HI all, i´m generally (like all of you) after stresses at stress concentration zones to estimate fatigue behavior. My experience is that in fatigue there are so many unknown parameters that the error in linear elastic stress prediction is much smaller than errors from boundary conditions and...
  9. mfinke

    stress concentration and fatigue

    Hi all, what i know about the part is from a hydraulic cycling test. I know the load and the rough cycles until crack occurs. We have not applied any strain gages. what i know about the material is from literature (Boller, Seeger / material data for cycling loading) I have looked for some...
  10. mfinke

    stress concentration and fatigue

    HI Gurmeet and Irwin, thank you for your replies. The material of the manifold is: Germany: EN-GJS-400-15 USA: ASTM A536 60-40-18 So if the stress at a notch, where i previously added a small radius is below yield, i can use this stress for the fatigue estimation. But which material...
  11. mfinke

    stress concentration and fatigue

    Dear all, i have read some articles in this forum and i think it is a very good source to share knowledge. I´m trying to do some fatigue estimation of manifolds under internal pressure. The more i´m reading about fatigue life prediction the more question i have. 1. stresses and strains...
  12. mfinke

    Help with CFD program selection

    Hi, you could also check out the following site: http://www.cfd-online.com/ it has a lot of information and some discussion forums cheers, MAtthias

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