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  • Users: blckwtr
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  1. blckwtr

    Polar moment of area offset axis

    Is Jp always Ixx+Iyy? I have two square steel sections offset from y-axis, the x-axis goes through neutral axis on both. I want to find the second moment of area, and I'm a bit unsure...
  2. blckwtr

    Over compression

    If somehow I have a rubber which is under a state of over compression and I apply more pressure to it. How can I determine the failure mode? Shear, tensile, energy consumption? Which? And when do I know I am in a state of over compression?
  3. blckwtr

    Logarithmic stress strain

    If I base an optimization study from engineering stress strain to make true stress strain curve, is it only valid up to UTS? Also, when calculating poison ratio, I get 10e4 result?! It should be close to 0.3 I have based my data from metric...
  4. blckwtr

    true stress strain

    In order to do plasticity analysis on metals, you need to put in the correct data in abaqus. So far, I have an example from Simuleon website and Dowling (Mechanical behaviour of materials, 4th edition). I find the very high values very strange, can someone explain? See attached file... I am...
  5. blckwtr

    Poisson ratio

    Hi, all. Is it possible to derive poisson ratio purely from uniaxial stress strain response?
  6. blckwtr

    Poisson number from uniaxial stress strain

    Is it possible to derive poisson ratio purely from uniaxial stress strain response?
  7. blckwtr

    Multiple springs and masses system

    I have this mass spring system consisting of 4 masses and 4 springs. It is preloaded, and I want to know the velocity on the "free" side of the system at a certain point. Also would be interesting to know the remaining forces when that mass hit the end...
  8. blckwtr

    Mooney Rivlin hyperelastic material failure

    Hi, all. I have defined a mooney rivlin material in abaqus, with a predefined set of points to elongation at break. However, I experience the material to take up more stress than what the material is capable of, based on a uniaxial stress strain curve. The stress state is triaxial, although the...
  9. blckwtr

    Mooney Rivlin Hyperelastic material failure

    Hi, all. I have defined a mooney rivlin material in abaqus, with a predefined set of points to elongation at break. However, I experience the material to take up more stress than what the material is capable of, based on a uniaxial stress strain curve. The stress state is triaxial, although the...
  10. blckwtr

    Pressure Penetration load not overcoming surace pressure

    I have loaded a rubber with a pressure penetration at 34.5 MPa. However, the surface will not separate from each other, although the surface pressure lies in the region of 11 MPa. Only the node which are picked from the pressure penetration dialogue box are affected. The solution converges just...
  11. blckwtr

    Analytical Rigid load and BC

    Hi, all. I am doing an axisymmetric 2D analysis involving analytical rigid components, made up of lines. Also, there is a deformable within. So far everything seems OK, but I suspect there is a problem with the way I constrain and manipulate the rigids. - I have within the parts defined a...
  12. blckwtr

    Unconnected regions with analytical rigid components

    I get a warning about unconnected regions in the assembly, but so far I think I have put it all together as it should. There are 4 analytical rigid parts which now are connected to its reference point, and within these 4 components, there are a rubber "seal", which are modeled as a deformable. I...
  13. blckwtr

    Pressure Penetration Loading

    Hi, I am trying to simulate a compression of a rubber, which is converging just fine. Afterwards I want to apply pressure on one side, but I get an error message, and quite frankly, I don't have a clue what to do. Any help would be much appreciated... THE SLAVE SURFACES...
  14. blckwtr

    H2S and CO2 corrosion

    Hi, all... I am currently doing a study on various materials and their properties under influence of H2S and CO2 for downhole equipment, e.g. tools for use in an oil well. So far I have found a general guideline which states that the listed materials are accepted, but the non-listed materials...
  15. blckwtr

    Axisymmetric Analysis of a threaded connection

    Hi, I am having some problems with analysing a threaded connection, where the bolt is hollow. So far the setup is complete, but I can't find a way to put the BC and loads correct on the model. Please, can someone help out? I can send the files needed if anyone have a chance to help out..
  16. blckwtr

    abaqus prerequisites

    Hi, all... As I understand you need either c++ or Fortran compiler in order to run subroutines, or do you need both? Just want a free software, not a fancy environment, which do I choose? Recommendations? Do I need to set env variables?
  17. blckwtr

    Unable to lanch pyuic from Qt Designer

    When I am in Qt Designer, and do the following; Form > View Code, I get the error message: "unable to launch c:/python34/lib/site-packages/pyqt5.uic" What to do? Does this also means that there is no way to translate from .xml to .py as well? I am running version 5.4.1 of Qt Designer, included...
  18. blckwtr

    Want to learn more about HNBR

    I want to learn more about rubber and especially HNBR. More specific, I want to learn the following; - FEA of elastomers - friction coefficients - temperature degradation when exposed to elevated temperature - material models - non-linear behaviour - effects of mechanical properties, and...
  19. blckwtr

    Want to learn more about HNBR

    I want to learn more about rubber and especially HNBR. More specific, I want to learn the following; - FEA of elastomers - friction coefficients - temperature degradation when exposed to elevated temperature - material models - non-linear behaviour - effects of mechanical properties, and the...
  20. blckwtr

    Yield strength reduction factor NS-EN 13445

    Hi, I am currently designing a pressure vessel for inhouse testing of some equipment, and just wanted to know the influence temperature have on the steel. Currently designing the vessel to 10.000psi and 150°C, I see that strength reduces by a factor of between 28% to 34%, which I think is very...

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