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  • Users: kilbchoi
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  1. kilbchoi

    Shell neutral axis offset consideration in NASTRAN

    Hi! Is there anyone who knows about the consideration of shell neutral axis offset in NASTRAN ? Especially when modeling honeycomb panel to the frame(beam) with laminated element, there is a offset for neutral axis with respect to the reference curve. I saw the dummy element with very weak...
  2. kilbchoi

    Attachment factor of 1.33 to the seating system

    Hi guys, Is there anybody who has a clear idea on the attachment factor of 1.33 in the seat design ? According to FAR, the factor is required to the attachment of - seat to the structure - belt/harness the the seat or the structure Therefore I understand for example, - It doesn't have to be...
  3. kilbchoi

    Crippling Strength in bending and Plastic Bending Theory

    Hi, Regarding the compressive failure mode in the bending member such as circular tube, rectangular tube, or hat section, What is the relationship between the plastic bending theory and the crippling strength ? If I consider the crippling stregnth as the compressive strength (Fcc < Fcy), it's...
  4. kilbchoi

    Criteria regarding Resin Content

    Hi guys, I am choosing the suitable Glass Fabric product. I am wondering if there is any criteria regarding the resin content. As far as I know, roughly 40% is quite standard. What about 30%? Obviously it can provide better mechanical properties for stfinness and strength. As far as I know...
  5. kilbchoi

    Bearing strength failure mode in the bolted joint

    Hi ! I am looking at the bearing strength of FRP material in the bolted joint. I am wondering what is the main failure mode for the bearing strength. In metal, it is obviously contact compress stress at the contact area. In my analysis model using NASTRAN, in-plane shear stress is more...
  6. kilbchoi

    RBE3 Element in NASTRAN

    Hi ! I have a question of rigid element usage of applying load. Let's suppose I put the rigid cylinder weight onto the wide cantilever beam end, and I applied the side load at the CG causing the torsion on the beam. I have four or eight bolts to fasten the cylinder. Most of people might use a...
  7. kilbchoi

    Bolt bending formula in single shear joint

    Hi ! In single shear joint, I normally pick up the bending moment arm with the half of assembled length. I've checked all references, but I couldn't find a formula of the subject. I blieve that moment arm is conservative. I need less conservative but more practical formula especially for...
  8. kilbchoi

    Bolt Hole Clearance

    Hi, Anybody who let me know hole clearance to allow all bolts transfer shear load? For instance regarding M6 (in metric). Thanks, K. Choi
  9. kilbchoi

    Regarding Single Shear Lug Joint

    Hellow! I have a question about single shear lug joint strength. If assuming I get the nominal axial strength of a lug, Fa, then one of my references, German design hand book, says that Fa* = Ka x Fa x (Sbr / Stu) where, Fa* = final lug strength of sigle shear lug joint Ka =...
  10. kilbchoi

    Shear Panel Modeling in NASTRAN

    Hi guys! Anybody who let me know the modeling way using CSHEAR element? As u know, spar web can be modeled with that element very often for simplicity based on conservatism in aerospace industry. I tried it comparing with the other elements, membrane and plate, but I got a strange result for...

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