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  • Users: huiying
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  1. huiying

    Drop Test without LS-DYNA

    Hi, Would like to know whether it is possible to do a drop test analysis just using Ansys Structural? Has anyone tried before? What is the limitations and how is it different from using LS-DYNA? Thanks & Regards.
  2. huiying

    Stress Concentration in Bolt Holes

    Thank you for all your replies. First, I would like to answer Garland's question to make myself more clear. I'm using Patran/Nastran Linear Static for my FE analysis. I model the screws as bar elements and connect them to the holes on the solid body(Hex elements with holes between them) using...
  3. huiying

    Stress Concentration in Bolt Holes

    Hi, We usually get stress concentations in bolt holes. If the FE result shows that the stress at these holes is greater than the UTS of the material, does it mean that the whole structural will fail? Sometimes, bolt holes are ignored during simplification of the models, so how to know...
  4. huiying

    Thread tolerance

    thanks for replies. Usually if the class is not specified, is there a default class to follow? for eg, if it is just stated the thread as 1/2-13UNC instead of 1/2-13UNC-3B? Thanks & Regards.
  5. huiying

    Thread tolerance

    Hi, What is the advantage of having a class-3B tread compared to a normal thread? Thanks & Regards.
  6. huiying

    Coupled Load Analysis using Patran

    Hi, Is there any resources on performing Coupled Load Analysis using Patran/Nastran? Thanks & Regards.
  7. huiying

    Strength of Laser Weld before/after Heat Treatment

    What if heat treatment is carried out before welding. Is there any problem with that? Is the expected tensile strength of the weld expected to be lower than if the raw material is welded without any heat treatment?
  8. huiying

    Strength of Laser Weld before/after Heat Treatment

    Hi, Thanks for your replies. The material that that I'm welding is SS 17-4. I believe (C) will give the strongest weld. But how about comparing (A) and (B)? Which one do you think will give a stronger weld? Thanks & Regards.
  9. huiying

    Strength of Laser Weld before/after Heat Treatment

    Hi, I would like to know whether there is any difference in the weld strength if a) welding without any heat treatment b) welding after heat treatment c) welding prior to heat treatment and what's the reason? Thanks & Regards.
  10. huiying

    Substructuring in Patran

    Hi, Is there any examples on how to do substructuring in Patran available online? Has anybody done that before, any advice? Thanks & Regards.
  11. huiying

    Equivalent Thickness for Aerofoil Sheet

    Hi, I'm modelling a thin aerofoil sheet using plate elements. Would like to know if there is an equivalent thickness for aerofoil shape. Thanks & Regards.
  12. huiying

    Heat Treatment before vs after Machining

    Hi RebelBrill, Thanks for the info. May I know if the title of the guide book that you mentioned? Any idea whether I can get it online? Thanks & Regards.
  13. huiying

    How to enter Pressure field in Patran?

    Hi shlr, Yes, I'm using PATRAN s/w. I have also placed the CFD (what is the discrete field?) and structural model in 2 grps. They are both in the same geometric place. Thanks & Regards.
  14. huiying

    How to enter Pressure field in Patran?

    Hi shlr, Thanks for the advice... but I don't quite understand how to perform the part c). How do I create a field base on the CFD field? Regards.
  15. huiying

    How to enter Pressure field in Patran?

    Hi shlr, Thanks for your reply. I am unable to describe the pressure as a field because it doesn't follow an equation. All I have is a dataset with over 10,000 pts. This data is actually from a CFD result with corresponds to CFD mesh which does not coincide with the FE mesh. Regards. Merry...
  16. huiying

    Strength of Laser Weld

    Hi Cory, Thanks for the reply. There will be a heat treatment process to H1075 before the laser welding process. There will not be any post-weld heat treatment. Thanks & Regards.
  17. huiying

    Strength of Laser Weld

    If I'm using SS 17-4PH, what is a comfortable figure I can start with? Regards.
  18. huiying

    Strength of Laser Weld

    Hi, I would like to know if there is any documentation on the strength of laser weld. Is it about 80% of the material strength? Regards.
  19. huiying

    Strength of Laser Weld

    Hi, I would like to know if there is any documentation on the strength of laser weld. Is it about 80% of the material strength? Regards.
  20. huiying

    Heat Treatment before vs after Machining

    Is that to say that it is easier to machine 17-4 after H1075 then before? What kind of tooling do you usually use? Is there a formula to calculate for heat shrinkage? How about warpage? I thought it is difficult to determine the kind of warpage that will be encountered? mrainey mentioned that...

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