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  1. Vitkacy1989

    Contact with bolts - different results SHELL vs. SOLIDS

    Hello! Below is a figure of what I am struggling to compare. Standard friction contact defined between plates. 1st load step is preload, 2nd load step is shear load. I am checking dependency of friction change onto how shear load is distributed between bolts and friction at contact. For solid...
  2. Vitkacy1989

    Ansys displacement calculation

    Hi Folks, I understand Ansys solves static problem by following steps (showing just those important to my question, order is important): 1. Material is assigned to elements 2. Shape functions and stiffness matrices are created basing Young's modulus E 3. Calculation of displacements 4...
  3. Vitkacy1989

    Improve my planning, time management etc.

    Hi Folks! Have you ever been interested in any time management systems? How to schedule your day, week or month better so you can get more things done, etc. And yet I love when it would be simple as for us engineers, we need to have things ready to be applied :) The one I liked very much is...
  4. Vitkacy1989

    Does this bolt see bending or not?

    Hi all, Picture below explains the system. I have a solid model with moment load at one side and fixation at other. Two tubes are connected with two bolts to check moment transfer. F2 is obviously larger than F1 due to different levers lengths. FEA shows high stress at bolt's shaft mainly due...
  5. Vitkacy1989

    Fatigue – when weld detail is „starting to be“ the base material detail?

    Hi All, The question is how to select proper reference stress when weld detail (fatigue category 112) is „starting to be“ the base material detail (fatigue category 140). In other words for what X-position one should use category 140? Please see the picture:
  6. Vitkacy1989

    L-Flange bolted connection

    Hi, I am looking for a reference in English which would contain formulas required to check following L-Flange connection (please see picture below): Do you have any and may share? Regards!
  7. Vitkacy1989

    Book on debugging FE model, do you know any?

    Hi All, As in subject, I am looking for some book or other good reference which would treat about debugging the FEA. E.g. troubleshooting contacts (or other non-linearity) and solution convergence in general... any kind of debugging guidance document on FEA is welcome. Regards !
  8. Vitkacy1989

    APDL Script/Commands Editor

    So far I am using Notepad ++ to create my scripts input files. Is there any editor that would be able to show syntax of APDL commands when writing them? And perhaps would be able to auto-finish/propose commands that you start to write? Example: user writes in editor EMODIF and editor shows him...
  9. Vitkacy1989

    How to connect part meshed with and without mid-side nodes ?

    Hi Gents, Please see figure below. I have a shell model, the top part includes mid-side nodes, while bottom part is meshed without mid-side nodes. This is a test model. At the interface between parts there are edges with nodes. Is there any option to connect those edges in bonded-like manner...
  10. Vitkacy1989

    Geometry Parametrization in ANSYS Space-Claim

    Hi Folks, What are your best practices to enable efficient parametrization of the geometry in Space-Claim module? Say, you have created shell model basing polygon with varying radius at length (cone-like), and now you would like to somehow change the radius at the bottom base with one click...
  11. Vitkacy1989

    Best book for >>Strength of Materials<< stress reference

    Hi All, I am looking for a book rather with tables than theory, covering strength of materials such as e.g. some particular section shape with loading and corresponding stress visualization, etc. Well-known Roark's formulas is an extensive reference but it does not provide practical assistance...
  12. Vitkacy1989

    Best book for >>Strength of Materials<< stress reference

    Hi All, I am looking for a book rather with tables than theory, covering strength of materials such as e.g. some particular section shape with loading and corresponding stress visualization, etc. Well-known Roark's formulas is an extensive reference but it does not provide practical...
  13. Vitkacy1989

    Standard Contact - FKN (Normal Penalty Stiffness) vs. STRESS

    Hi All, Problem: One of the most important parameters when setting up the Standard Contact is FKN value (Normal Penalty Stiffness). FKN controls contact penetration value, thus drastically influencing stresses in neighboring elements. FKN value is governing, e.g. if one of your plates in...
  14. Vitkacy1989

    Ansys Spaceclaim Scripting

    Hi All, Do you have any references for a good first steps into geometry scripting in Spaceclaim? Will be much appreciated... Regards Folks!
  15. Vitkacy1989

    Eurocode EC3 Strength Check of the Preloaded Bolt

    Hi Folks, In reference to the figure below, excerpt from EN-1993-1-8:2005: A - In clause 3.6.1 (2) Gamma M7 is used B - In clause for Design Slip resistance 3.9.1 (2) there is no safety factor used. Question: if I am checking Tension of the bolt (not a Design Slip), should I use Gamma M7 as...
  16. Vitkacy1989

    Sweep Meshing - simple but hard to achieve

    Hi All, Please see picture at the bottom. I have two queries regarding sweep meshing for a nice cylindrical part: A. How to force orange body to have a nice radial-form mesh? B. How to force green body to sweep along length without rotation (you may see that mesh is slightly rotated)?
  17. Vitkacy1989

    Differences between Steel Industry and Aeronautic/Space Industry on FEA

    Hello All, I am FEA Expert in steel, my background is Oil&Gas, Energy and similar industries. I am wondering what mechanical phenomena should I consider to be able to provide reasonable FEA design in your industry. Thus, I would like to ask my fellow Aeronautic Engineers: 1. What material...
  18. Vitkacy1989

    Bolt as BEAM188 - Which internal force should be used for bolt check ?

    Hi All, Please see figure below. Blue and Orange solid steel bodies are bolted with Black beam188 elements. Both ends of the bolt are connected with solids via Red RBE3. Gray plot shows bending moment of the bolt. Bolt is screwed just to some depth in the Orange plate. Is it good to use for...
  19. Vitkacy1989

    Difference between coupling CP and constraint euqation CE

    Hi All, Do you know, what is the difference between coupling CP and constraint equation CE (e.g. RBE3] ? Regards!
  20. Vitkacy1989

    MASS21 - use with or without the rotary inertia?

    Hi Folks, I have a question on MASS21 keyoption (3). We can decide whether or not our mass element should include rotary inertia. So far I always thought that rotaty inertia is always a-must since it lets knows the Solver how unmodelled part behaves under certain acceleration. My question...

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