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  • Users: Pshell90
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  1. Pshell90

    Honeycomb Modeling

    Dear SWComposite, before posting in details, I have a question.I feel embarrassed to ask this question but I'm rookie at composite materials. Is it important to know the direction of applied force in orthotropic materials ? For example if we exert a force in x direction, other mechanical...
  2. Pshell90

    Flutter modeling in PATRAN

    I want to model a composite beam in PATRAN & calculate flutter features. first of all, I have a problem with geometry of beam in PATRAN in aeroelasticity modulus. because it is 1-D, there is a serious problem for coupling structural mesh to aerodynamic mesh with spline. Because for aero grids...
  3. Pshell90

    Neil Armstrong dead at 83

    Neil Alden Armstrong : August 5 1930 – August 25 2012 Age : 83 He may rest in peace . [sad]
  4. Pshell90

    Honeycomb Modeling

    Thanks for your information !! They are so much useful. My S Matrix looks like a orthogonal matrix, but it isn't symmetric !! because of that confusing equations for [nu] ( Poisson's ratio ) at that book, S Matrix is not symmetric !!
  5. Pshell90

    FLUTTER

    Yes !! I'm sure. That's flutter and flutter velocity & frequency . I want to model it in PATRAN/ NASTRAN!
  6. Pshell90

    Modeling Honeycomb structure in Patran

    Dear ZeroExperience, Could you please tell me how I can model honeycomb structure using MSC.Laminate Modeler ?! Thank you in advance, my friend.[wink]
  7. Pshell90

    FLUTTER

    Thanks guys !! your suggestion was really helpful !! I just wanna model a simple sandwich beam & then evaluate its flutter velocity ! Here I faced to 2 problems : 1. How can I evaluate the other modes for my beam ? because I think that NASTRAN/PATRAN just check the 1st mode for...
  8. Pshell90

    Honeycomb Modeling

    Dear RPstress, That was useful. but the links related to Brandi Hampson which you mentioned do not work ! Thank you again. About derivation of my equations, I use this book to evaluate my honeycomb core mechanical properties: " Cellular Solids: Structure & Properties_Second Edition by Lorna...
  9. Pshell90

    Flutter modeling in PATRAN

    Hi guys !! Is there anyone here who has ever made a flutter model in PATRAN/NASTRAN ?! I really need help ?
  10. Pshell90

    Flutter modeling in PATRAN

    Is there anyone here who has ever made a flutter model in PATRAN/NASTRAN ?! I really need help ?
  11. Pshell90

    FLUTTER

    Thank you guys !! Is there anyone here who has ever made a flutter model in PATRAN/NASTRAN ?!
  12. Pshell90

    Modeling Honeycomb structure in Patran

    Dear ZeroExperience, Thank you so much. This is awesome !! [pipe]
  13. Pshell90

    FLUTTER

    Hi guys! I'm working on flutter phenomena. Does anyone know anything about that ?! I have a big problem with that !!
  14. Pshell90

    Honeycomb Modeling

    Brian, Thank you again & again ! It is so much useful. and what about my second question ?! about the S Matrix ?! Could you help me about that? Do you also know any useful site or book which could help me ? Thank you so much !
  15. Pshell90

    Modeling Honeycomb structure in Patran

    Dear Brian, Thank you a lot ! but I just for checking, you mean that in this way that I said, the transverse shear modulus does not exit !! I'm sorry, but could you please explain more . I'm a rookie . Thank you again,Brian.
  16. Pshell90

    Honeycomb structure modeling

    Hi guys!! I'm working with PATRAN and I wanna model a sandwich beam with honeycomb core. but I don't know how to model it in PATRAN? I used COMPOSITE in material and defined facesheet and core !! I want to know if it is a good way to define a sandwich beam ? I want to have a flutter analysis at...
  17. Pshell90

    Honeycomb Modeling

    Hi guys ! I'm working on Honeycomb materials and I'm going to use it in a sandwich beam. I derive equations and I'm sure about it ! in this equation, I have a shear modulus of core ( means Honeycomb ),G, which I don't know what it is ! I mean in this equation G is G13 or G23 ?! I also found a...
  18. Pshell90

    Modeling Honeycomb structure in Patran

    Hi guys!! I'm working with PATRAN and I wanna model a sandwich beam with honeycomb core. but I don't know how to model it in PATRAN? I used COMPOSITE in material and defined facesheet and core !! I want to know if it is a good way to define a sandwich beam ? I want to have a flutter analysis at...

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