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  1. SWComposites

    Low Barcol Hardness Readings after switching materials (Phenolic Prepregs 270°F cure)

    "drum peel" test of a sandwich panel? that is going to verify the core to facesheet bond, not the facesheet strength "flammability" will verify nothing about strength ("load"). and I'll say it again, I have no idea what hardness correlates to, if anything.
  2. SWComposites

    Low Barcol Hardness Readings after switching materials (Phenolic Prepregs 270°F cure)

    LOL. I would never believe that statement from the manufacturer without actual data to back it up. Is Hardness a test that the material supplier performs for batch certification? is it listed on their product datasheet. Frankly, in 40+ years in the composites world, I've never heard of a...
  3. SWComposites

    Transverse Properties of Carbon Fiber

    I don't know where they get the values. And I've never found micromechanics models to be of any use in real industrial applications of composites, so don't care. But can't imaging E2f values having much effect on overall macro scale properties.
  4. SWComposites

    Transverse Properties of Carbon Fiber

    E22 for a bare fiber is almost never tested. And don't know why anyone would need that property.
  5. SWComposites

    Passing of John Hart-Smith

    And the author of a very prescient paper on the adverse effects of "outsourcing".
  6. SWComposites

    Insert bending test

    if you have modelled it with the typical single node connection at the fastener, connected with spring/cbush/bar element, which ignores contact surface and clampup effects, then the moment is likely incorrect (way too high).
  7. SWComposites

    Insert bending test

    I am not aware of any such standard test. You will likely need to design a test setup. What is the structural configuration that is introducing a large moment at a single insert? Sounds like a redesign is needed.
  8. SWComposites

    Compressed Air vs Nitrogen for Autoclave Cures

    https://www.apexgasgenerators.com/post/the-use-on-nitrogen-in-autoclave-applications#:~:text=During%20this%20curing%20process%20the,an%20inexpensive%20and%20inert%20option.
  9. SWComposites

    Overall Laminate Strain in Femap

    Going off FEMAP memory from long ago, I think you can get shell element surface strains. But ply strain and laminate strain is the same (unlike stresses), since strain is linear thru the thickness. The surface ply strains will be the largest values, for the directions of that those plies...
  10. SWComposites

    Overall Laminate Strain in Femap

    ok. request strain output.
  11. SWComposites

    Plaster Mandrels alternative materials for washout mandrels (fiber glass air ducts)

    couple of links from Google search for "water soluble mandrels" https://acmtucson.com/products/ https://northerncomposites.com/wash-out-tooling-materials/ https://soltecaz.com/products/ probably other options
  12. SWComposites

    Hi

    and why is a question about welding a metal pipe in a composite materials forum? move to the Welding forum.
  13. SWComposites

    Hi

    fullsole???
  14. SWComposites

    Disbond Creating During Heat Blanket Repair

    Is the part an acoustic panel with facesheet perforations? If so, that is a direct moisture path into the core and adhesive, raising the risk of degradation. And if is not PAA core then the is risk of corrosion effects.
  15. SWComposites

    Disbond Creating During Heat Blanket Repair

    Is the issue caused by actual degradation of adhesive due to heat during repair cure? > possible. depends on the original adhesive cure temp (you state 250F cure). also any in-service thermal exposures. how old/#cycles is the part being repaired? Probably not the case if an approved SRM...
  16. SWComposites

    Film Adhesive - Supported vs Unsupported

    I suspect so, but get price info from the suppliers.
  17. SWComposites

    Film Adhesive - Supported vs Unsupported

    handling supported adhesive is much easier. bondline thickness control is somewhat better with supported adhesive, but depends on the joint config and process what are you using the adhesive for? what is the joint configuration? what is the tooling and cure process? knit vs random carrier...
  18. SWComposites

    Dissimilar Material between Carbon Steel Flange to Stainless Steel Strainer

    yes, what is this for? what is it used on? in what environment? if you need to ask the question, the answer is probably "yes".
  19. SWComposites

    Composite stuck to mdf mold

    So if the mold is on the outside of the part, why not split the mold into two halves that you disconnect after cure. Seems like it would be much easier to demold that.
  20. SWComposites

    Composite stuck to mdf mold

    You could also try heating the part and see if it pops off the mold. Wait, is the mold inside or outside of the cone (part)?

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