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  1. automechanicar

    Reaction forces in a solid model in FEMAP/NX Nastran

    Thanks a lot. I dont have the software at the moment, but I will try tonight. I have also another question concerning postprocessing. When one wants to analyze the deformed shape of an object, one has either the option to see the actual deformation (scale 1:1) or deformation with some...
  2. automechanicar

    Reaction forces in a solid model in FEMAP/NX Nastran

    Hoi, How can I retreive reaction forces in a solid model at a specific location? I know that there is a quanitity called COnstraint Forces in FEMAP 9.2 but when I use this, I get a fringe plot where the legend denotes only nodal reaction forces. However, I am interested in the sum of nodal...
  3. automechanicar

    Hexmesh in Femap

    Hi Thomas, The part on materials is clear now. Thanks a lot. About hexmeshing: You probably mean a "pair of surfaces", thus two surfaces instead what wrote earlier. The problem is that Femap does indicate which pair of surfaces has a problem when trying to mesh. Is there a way to visaulize...
  4. automechanicar

    Hexmesh in Femap

    Hi Thomas, Thanks for your comments. But how can I than make sure the mapping on all surfaces is the same? The program does not even specify which surfaces are having a problem. And if I assign different materials (and properties) to different parts, how can I verify that the materials are...
  5. automechanicar

    Nonlinear transient impact analysis with contact

    Thanks for the info. I am using the combined package FEMAP/NX Nastran. I think this the socalled basic solver which is not the explicit solver that is most appropirate for these types of problems. This basic implicit solver can handle nonlinearity, however only one a each time, being either...
  6. automechanicar

    Interaction of gears (contact analysis)

    Hi justkeepgiviner, It's exacly this simulation performed here with Dytran. I Pro/Mechanica it is possible to transfer forces and torques form Mechanism to Mechanica, only I dont know how to setup this type of simulation. I dont know what type of analysis I need (static or transient) and how to...
  7. automechanicar

    Hexmesh in Femap

    I have also antoher question. How to define material properties for differen solids? If I have two solid which are different materials, how to specify these materials? I am only able to assign on single material to all solids I have in my model. Thanks!
  8. automechanicar

    Hexmesh in Femap

    Hi, Almost everytime I try to hexmesh solids in Femap I get this massege: "Solid can not be meshed. Either Meshes on lateral surfaces are not fully mapped or base and top surface meshes do not match." This also happens often when I try to mesh relatively simple goemtries, like cylinders. The...
  9. automechanicar

    CFD problem using FEM, Understanding the Fluid element?

    There is various literature about FEM for heat an flow problems, for example: The Finite Element Method in Heat Transfer and Fluid Dynamics, by J.N. Reddy and D.K. Gartling. Here, you can find everything about FEM for these type of problems and of course the procedure on how to implement the...
  10. automechanicar

    apply load till fail

    What about the material model? Before failure a certain amount of damage is accumulated. I would say it's necessary to supplement the material model you use with any of the damage laws available. After a certain level of damage has been reached, the material fails. This is how failure is...
  11. automechanicar

    Flexible body dynamics with ABAQUS

    Gurmeet, If you take a look at the NE Nastran simulation of the combustion engine at http://www.nenastran.com/newnoran/animations for example.. Do you mean that this engine assembly has been analysed using MBD software (like MSC Adams or DADS or even within Nastran itself) first before the...
  12. automechanicar

    Nonlinear transient impact analysis with contact

    OK, thanks anyway.
  13. automechanicar

    Nonlinear transient impact analysis with contact

    Hi Gbor, The problem is that I dont know how to setup an impact analysis. Is there some kind of a tutorial example which adresses an impact problem? Or do you perhaps have an simple example that you may attach to one of your posts? This would be very helpful as I could explore an existing model...
  14. automechanicar

    Features of NX Nastran compared to NEi Nastran

    @wvillers, As far as nonlinear analysis is concerned, I have at my disposal the following: - Nx Nastran with FEMAP As far NX Nastran?FEMAP is concerned, we have the socalled basic package. This includes basic nonlinear analysis wih just one source of nonlinearity being, either geometric...
  15. automechanicar

    Nonlinear transient impact analysis with contact

    Hi, How can I simulate an object impacting a another object at certain speed or just a drop test. Starting with a sphere which impacts a simply shaped object (like a cube) seems the easiest way to begin with, but I simply can't start off. I know that it should be modeled as a nonlinear...
  16. automechanicar

    Features of NX Nastran compared to NEi Nastran

    Hi all, Does somebody know whether there is a tutorial on how to setup/perform analysis types shown as demo's on the Noran's website? I have not been able to find many examples different that just linear statics en very little on nonlinear statics. I would like to practise myself in nonlinear...
  17. automechanicar

    Gear analysis and other nontrivial modeling with NX Nastran/Femap

    Hi, Does somebody know how to perform a contact analysis between two gears, where the one gear drives the other one, thus both rotating with a certain rotation speed? Both gears are flexible so it should be possible to recover the stresses and displacements in the gears (including in the...
  18. automechanicar

    Flexible body dynamics with ABAQUS

    Hi, Does anyone has any experience with modeling of dynamics of multiple flexible bodies in contact. Take for example an engine block with it's pistons moving up and down. In this case you may wonder what are the stress induced in pistons, engine blosk casing and other components like the crank...
  19. automechanicar

    Interaction of gears (contact analysis)

    Hi, Is it possible to perform a stress analysis of two gears in contact, that is one gear is driving the other one. I mean a motion analysis, including (contact) stresses and displacements of both gears. Thus, actually a flexible body dynamics analysis, something which can be performed using...
  20. automechanicar

    Importing CAD Assemblies in Abaqus/CAE

    Thanks a lot! All works fine! I almost got scared that I had to assemble all parts again wihtin ABAQUS/CAE in a similar way as in a CAD environment. Kind regards.

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