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YT_494814-Alexandrite
14-Alexandrite
February 2, 2024
Solved

Meshing and weld issues for a rain cowl assembly

  • February 2, 2024
  • 1 reply
  • 5507 views

Dear PTC Community,
I am currently working on Creo Simulate to perform a FEA on a rain cowl assembly for different wind loadings and also to check if the current weight of this rain cowl assembly can be taken by the motorised louvers without failing (rain cowl assembly is mounted onto the motorised louvers with the help of bolts).

I have defined fasterners and weld connections wherever needed but facing some issues with them as listed below:
Issue_1: The perimeter welds defined at locations where the top part of the rain cowl assembly is being connected to the side part for example is not being taken into consideration and the solver says that it is taken as bonded idk why?

 

Issue_2: The end welds along the curve for the same two parts of the rain cowl assembly are ignored by the solver idk why either. (It is treated as bonded there)

 

Issue_3: Single element at the top left part of the rain cowl assembly shows an error (Can be seen when tried to run the own_weight static design study)


Issue_4: Problems creating shell model skeleton at and near the vertices shown in the attached snips. This is due to the welds defined there it seems as when I suppress the weld connection at those instances, the error vanishes. (NOTE: The mesh is created without the welds but with the welds defined at those instances, the error arises)

One last doubt - In order to check if motorised louvers can take the weight of the rain cowl, we only carry out the analysis for just the own weight (gravity load) without any wind loads right?

Please see attached zip file and  snips for your reference. Please guide. Many thanks.

    Best answer by SweetPeasHub

    (view in My Videos)

     

    Here is how to annotate the fastener measures.

    I would setup the simulation unit system to mm-N-s rather than mm-kg-s

    SweetPeasHub_0-1707334486500.png

     

    1 reply

    Y
    YT_494814-AlexandriteAuthor
    14-Alexandrite
    February 6, 2024

    Attached below is a hidden line view that shows the top and side part of the rain cowl assembly currently meeting at a single edge (highlighted in yellow). A fillet weld of 2mm is naturally meant to be in place to connect them in real life. Is the reason behind this weld not being taken into consideration is because there is not enough contact area available there? Just a doubt.

    YT_4948_0-1707223012114.png

     

    skunks
    skunks19-Tanzanite
    19-Tanzanite
    February 6, 2024

    I don't think such models work well ☚ī¸
    I always build new models especially for Creo Simulate, my example is included.

      Y
      YT_494814-AlexandriteAuthor
      14-Alexandrite
      February 6, 2024

      @skunks Ok noted, so you mean we model the welds in the part itself. Also, in order to check if motorised louvers can take the weight of the rain cowl, we only carry out the analysis for just the own weight (gravity load) without any wind loads right? If in this case, the solver still warns that the yield limit has been exceeded for any of these parts, does that mean the weight of the rain cowl assembly can not be taken by the motorised louver?

      However, a maximum of 216 MPa can be seen for the own weight run without any wind loads. Theoretically, we are expected to keep it below 235 MPa (Yield Stress) for the actual material used. The material defined to the model for the solver is just a standard material from the working directory. So, looking at the numbers, should the yield warning be ignored and the design should be considered safe? Please guide.

      YT_4948_1-1707234108200.png

       

       

      YT_4948_0-1707233721542.png

       

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