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  1. PanelGuy

    How to create voids PURPOSELY to test for NDT

    You could try the tip of a rubber glove. They always make a nice void and show up with Ultrasound. Atleast you could cut shapes and have them well defined. The mold release deal should work well. It might be hard to get measurable voids in a small sample, easy to evacuate. You may need to...
  2. PanelGuy

    Cracking in FRP Road Tankers

    The bigger issue I think George is alluding to is the thermal induced microcracking a the fiber/resin interphase. A high exotherm may cause a problem with this. Also, this could contribute to the failure by creating mircro breache in a veil... hmmm...Run a soak test on the laminate, the...
  3. PanelGuy

    where to get D.E.R. 353 epoxy

    Try the local distributor anyway, maybe he can sample you. Or he could point you to a local toll producer who may have stock that he could tap off or sell you. It kinda depends on how big a Chem user you are and whether you have any pull. Just be straight with whomever you are talking.
  4. PanelGuy

    joining together honeycomb panels

    There are several companies with systems and extrusions depending on the type of panels. The problem is that you can by the panels, and extrusions, or tool up your own extrusions and own the rights to them...either way somone is on the hook for a couple grand in tooling and a minimum run of...
  5. PanelGuy

    NDI - Tap Testing

    Golly blakmax...I do agree and that is where our product differ to the world...we have a bit more tolerance of damaged bondline in most of our application. I gotta tell ya, if I saw the technician walking down the wing bouncing a golfball, I would probably get off the plane. The flip side is...
  6. PanelGuy

    NDI - Tap Testing

    There is a specification on how to build the hammer for tap testing. I can't find my copy of Bitzer's book right now or I would let you know a spec. Talk to the folks at Wichitech. They have several devices that are automatic tappers with acoustic sensors. As well, the only place that you...
  7. PanelGuy

    Clarification on FRP and similar materials

    After twenty plus years of the industry and dealing with non-technical Sales people I will not refer to anything as FRP. In reference to boats, tanks, tubs, cars...It almost always means some kind of fiberglass, woven or random, in a polyester matrix. In electronics it is almost always fine...
  8. PanelGuy

    EPS Aluminum Skin Sandwich Panel

    The Hexcel guides are good...Bitzer wrote them and they are the "cliff's Notes" for his "Honeycomb Technology" book. Broutman wrote a great book that includes alot of the matrix code. I found it friendlier that Zenkert or Tsai's. I have always defaulted to the Hexcel TB that RP notes, it is...
  9. PanelGuy

    Where to source unidirectional laminate

    There are a few guys, but try Coda composites in Winona MN, they can probably hook you up with small quantities of whatever you want for a price...
  10. PanelGuy

    Concrete Crack Sealant required

    Interesting idea...sort of a rubberized binder for the cement. It is all water based so should be compatible. I really don't know that much about the concrete chemistry, but with the Polymer concretes out there, it is probably doable. Actually with an exothermic concrete you could probably...
  11. PanelGuy

    Concrete Crack Sealant required

    Look at a waterbased PolyUrethane Dispersion (PUD). These are used lately as the overcoat on laminated floor. Witcobond makes one that is 30% solids, dries and is really a thermoplastic urethane (more like a hot melt then) so can be reheated and made tacky. But the 296 has a modifier that...
  12. PanelGuy

    Honeycomb core shear at support points

    hmmm...Depnds on what you are doing for stiffness. Generally the ribbon is run parallel to the width of a rectangular panel because the slice is rectangular in nature. If you analysis shows that the ribbon must be parallel to the length then that is how it should be. If it does not matter...
  13. PanelGuy

    Honeycomb core shear at support points

    I see the issues. I really don't know how to attack it without some testing. Perhaps you can model it as you are and in a separate model put together a localized example of the attachment feature and apply the stress profile from what you already have...dunno, made sense when I started typing...
  14. PanelGuy

    Re: DAN 1216-01 material

    Probably Cytec
  15. PanelGuy

    Peel tests for carbon/epoxy.

    You know, it may be useful to set your own internal standard. Perhaps pick a metallic substrate with appropriate surface tretments that you make your standard and then make it thin enough to allow a T-peel. You will have to go back through your "catalog" and redo some testing, but it would...
  16. PanelGuy

    Honeycomb core shear at support points

    There are a couple of common solutions you can find in the online resources at MC Gill or Hexcel. However... The more you can distribute the load in a hole in a lamination, the better. You can do this by laminating with a higher density core in sert or even a monolithicinsert...Aluminum puck...
  17. PanelGuy

    Peel tests for carbon/epoxy.

    Agree 100% with CP...Call Dr. Adams. Doing a true T-peel would be best, but you need to mold your substrates that way which may be a problem. But if you are needing it frequently the fixtures would not be so bad. Also you could look at Lap shear. This gets interesting because if you...
  18. PanelGuy

    Environmental Degredation

    I agree with what is here. It is the downside of any material is that it is easy to miss the defects inside. As to evironmental degradation effects on aircraft? I would agree the only non-destructive method would be an ultrasound. I did a repair on a sailboat rudder (4 ft long). The onwer...
  19. PanelGuy

    moldable transparent sheet material

    search for "panelite express" for an interesting idea.
  20. PanelGuy

    Honeycomb Failure

    All the info is right on. There are a couple of ggod books, the most basic is Tom Bitzer's book on honeycomb. The Hexcel Technical bulletins on honeycomb, Design and construction are the Cliff's notes, but Bitzer includes how to set up your lab (did it) what fixtures to buy (got em) and other...

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