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  • Users: groveri
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  1. groveri

    safety margins for composites

    Do aircraft companies that use damage tolerant strain allowables (eg. open hole) for composites use maximum limit loads to calculate safety margins or do the loads have safety factors included in them. Like MS = Damage tolerant strain allowable for the laminate/max limit load strain -1.
  2. groveri

    film adhesive bond strength

    I'm designing/analyzing a carbon/epoxy filament wound aluminum lined pressure vessel with a film adhesive bond between the line and composite. I have a region of high adhesive shear, remote from the edges so the bond is in transverse compression (no peel stress) due to the internal pressure...
  3. groveri

    water absoprtion

    I have a material datasheet with a property called "Water Absorption" with value of 0.70% at condition of 50% GH/EQ. I'm not familiar with the term GH, I assume EQ is equilibrium. Can anyone explain the meaning of GH and what the 0.70% value means? The datasheet also has "Moisture Absorption"...
  4. groveri

    material coordinate system

    I have an abaqus model translated from another code with axisymmetric solid orthotropic elements. In the original modlel the orthotropic material properties were relative to the edged defined by the forst 2 nodes. In the translation, the reference to the element edge was lost and the...
  5. groveri

    isotropic vs kinematic hardening

    Thin metal liner performance in filament wound pressure vessels is enhanced by autofrettage of the liner. The pressure vessel is loaded beyond the yield strength of the liner so that the liner is compressed when depressurized. The liner will then have a larger elastic range to operate in...
  6. groveri

    carbon steel strain hardening

    I'm doing an FEA of a carbon steel line composite pressure vessel with fully reversed plastic loading during the autofrettage cycle. I have the elasto-plastic stress-strain data, but I'm looking for guidance for hardening during the compressive part of the cycle following the initial tension...
  7. groveri

    COSMOS/M installation - Windows 7

    I have a permanent cosmos/m license I've use for 5 years w/ Windows XP w/ dongle. Tried to install on new Windows 7, 64 bit machine. New machine recognizes dongle, but not licence file. Any tips?
  8. groveri

    axisymmetric analysis with asymetric loads

    I'm trying to do a simple 1 element static linear asymmetric load analysis of an axisymmetric PLANE2D element model (COSMOS/M 2008) which requires us of the A_ASYM command. The COSMOS documentation is pretty weak on the subject. I apparently get a successful run, but the results are null. My...
  9. groveri

    low temperature fatigue of hdpe

    I'm looking for fatigue data for hdpe at about -45C (-50F). Seems to be a lot of data at and above RT, but little at low temperatures. Can anyone help?
  10. groveri

    buckling of cylindrical shell in compression

    I'm trying to derive eq. (f) in Timoshenko's Theory of Elastic Stability, 2nd Ed. Article 11.1, p. 458. Its for the increase in strain energy during symmetrical buckling in a cylindrical shell. I've got the 1st and 3rd terms, but for the 2nd term, (piA^2Ehl/2a), I have a Poison's ratio squared...
  11. groveri

    high strength ball joint

    I need to make a ball joint as small as possible, so I need to use a high strength steel. The ball has an integral threaded shaft. The max tensile load is 60% of the max compressive load. Temperature is <200F, >-100F. Life of part is short - few high loads. I'm looking for suggestions for...
  12. groveri

    fiberglass g10

    I've worked in composites forever in the aerospace business and have run into G10 fiberglass a few times, but don't really know what it is. Looks like a simple laminate made from woven fiberglass. Does anyone know details like ply angles? Is it just a 0/90 layup?
  13. groveri

    large spring supplier

    I'm looking for a compression spring supplier for what I think is a pretty big spring. Max static load is about 30000 lb. I think I need a spring constant of about 30000 lb/in.
  14. groveri

    crack growth data

    I'm looking for an on-line source of crack growth data (da/dn), particularuly 6061 aluminum. Does anyone have any links?

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