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  1. dravid

    cylinder using frame structure

    Hi, I want to design the cylinder made solely from frame (no skin) to connect two different cylinderical sections. The major loading conditions are axial compression and bending moments. Can anyone give me good refrence for designing such type of structure.
  2. dravid

    axisymmetric element

    Thanks for the reply. Yes i forget to mentioned the solver, it was Nastran. Due to that problem, I used the Ansys which has QUAD axiysmmetric element.
  3. dravid

    Shear Strength

    Most of the mechanical properties about elastomers(or rubber) are available in the form of Hardness. I want the shear strength of the elastomer,is it possible to calculate such mechanical properties (strength and modulus) from the hardness? If yes from where i can find ther relations. Thanx
  4. dravid

    Is there any data on the compressiv

    Hi ParaDoc and others. i am doing the joint analysis for the filament wound pressure vessel and its laminated skirt. Between the joint i am using some shear ply, for this purpose i have to use some shear ply, does any of you recomend me some elastomer. I have read about the use of EPDM, but...
  5. dravid

    EPDM AS SHEAR PLY

    hi, I want to use the some material as shear ply between the laminated skirt and composite pressure vessel joint, for this i have found out that epdm is quite suitable, can any body recomend me some edpm grade and its mechanical properties, especially shear modulus ( which is dependent on...
  6. dravid

    collapsible mandrel for filament winding

    Thanks isthill, Do you have any idea how to prepare metal (collapsible) /non metal mandrel for the ASTM D 2585 test bottle. I am looking for some book or refrence to construct mandrel for filament winded pressure vessel. Thanks again.
  7. dravid

    collapsible mandrel for filament winding

    Yes.
  8. dravid

    collapsible mandrel for filament winding

    Hi, i want some references regarding the collapsible mandrel for filament wound pressure vessel. i am interested in such tooling which can be removed easily from the vessel after winding. Any comment will be highly appreciated.
  9. dravid

    Joining metal boss to pressure vessel

    I want to know how to find the strength of adhesive joint between metal polar boss and composite in filament wound vessel. which adhesive i should use if i am using carbon-epoxy system. and how to define its thickness between them. Dravid
  10. dravid

    stiffened cylinder under bending moement

    Thanks again, in equation I(entire section)= I(cyl.)+I(stiff.) +Ad^2(cyl.)+Ad^2(stiff) Do i need to use Ad^2(cyl.), since I(cyld)=(PI/64)*(Dou^4-Din^4), give I at its center.
  11. dravid

    stiffened cylinder under bending moement

    Thanks warrenw, What i understand from your answer, is that for symmetrical case (as that of stiffened cylinder), y=Radius of cylinder for thin cylinder and y=distance from center of cylinder to outer edge of flange for stiffner. is it true? Also, i have 'I' for stiffners at their centroid...
  12. dravid

    stiffened cylinder under bending moment

    Hi, I have devlop the program for the stiffened cylinder under buckling. Now i want to add stresses due to bending moment in it using the relation stress: SIGMA= My/I. So that i could add it in the stresses develop in due to axial compression. here I=Icyl+Istrnger+Iring The question is how...
  13. dravid

    stiffened cylinder under bending moement

    Hi, I have devlop the program for the stiffened cylinder under buckling. Now i want to add stresses due to bending moment in it using the relation stress: SIGMA= My/I. So that i could add it in the stresses develop in due to axial compression. here I=Icyl+Istrnger+Iring The question is how...
  14. dravid

    BUCKLING OF COMPOSITE SHELL UNDER BENDING MOMENT AND TORSION

    Hi, I want some relation to find out the buckling of composite shell ( non symmetric laminate) under the bending moment and torsion. There are good realation available in SP 8007, but they are realated to symmetric laminate. Any help will be appreciated.
  15. dravid

    getting large displacement

    Hi, I am doing axisymmetric analysis of orthotropic pressure vessel.It is the vessel with cylinder and elliptical heads. for this purpose, i am using large displacement static analysis with 10 load steps. The problem is that i am getting very large displacement values, but on the other hand...
  16. dravid

    launch pad loads calculation

    Thanks for the reply, infact i proceed the work by considering the vehicle as a beam and then calculate the SF & BM due to the distributed wind load. In this regard a book title "B.M and Air vehicle systems" by H.S.Seifert, Kenneth Brown , helped me a lot.
  17. dravid

    launch pad loads calculation

    Does some body give me the direction in calculating the bending moment created in launch vehicle when standing on the launch pad due to wind.
  18. dravid

    stiffened cylinder design

    I want to design a stiffened ring & stringer cylinder which can withstand certain axial, torsion and external pressure. Want some direction to continue. Initially i am not interested in min. weight design but certainly it will be the issue in future.so any recomendation in this regard is also...
  19. dravid

    Axisymmetric elliptical dome stress analysis

    Hi, yes i know that otherdome profile can give less bending stress. But i want the reason why Ansys is not providing me correct Meridonial Stress(SY) in axisymmetric analysis. I model the structure in XY quadrant, with Y-axis as symmetric axis. It give quite good result for hoop stress(SZ) but...
  20. dravid

    Axisymmetric elliptical dome stress analysis

    Hi, I am doing an axisymmetric analysis in Ansys. It is the pressure vessel with ellipse dome. i model the ellipse with constant thickness and some portion of the cylinder in the model. when i get the results , the hoop stress(SZ) and displacement are quite right. But the problem is in the...

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