Originally Posted by SGT Rock
Something else I was thinking of when after I had already seam sealed the tie outs and then taped over them: What if I put enough seam seal on them to create a good surface for the cuben and 3M tape to bond too? I think that maybe if I were to do it again I would use 1/2" wide ribbon instead of para cord, and I would cover them with enough seam seal to help bond them to the patches.
My next round of tie-out testing will have 1/2" polypropylene straps sewn to DP's "Triastic" fabric, which is a polyester spinnaker cloth with a polyester coating. Then I'll bond the Triastic to cuben and see how much force it takes to cause failure and where it breaks.
Here's a picture of my test cuben, 15" x 15" bonded to a piece of aluminum on one edge so I can pull it evenly across the whole width. Below it is the 2" x 2" square of Triastic with the strap sewn to it.
Here is the Triastic patch bonded to the cuben with 3M 9460 adhesive transfer tape (plus Primer), ready for the pull test. I have already tested the Triastic-to-cuben connection, both sewn and with 9460 tape, and I know that both methods of connecting them are strong enough. What I expect to learn is where the cuben material will tear and how much force it takes to tear it. From Sgt. Rock's video, I see I could further strengthen the connection by adding a layer of cuben over the Triastic patch, and I may do that in the future because it would provide a way of tapering the reinforcing patch (if the cuben added was bigger than the Triastic). Earlier pull tests have shown that a strong reinforcing patch on cuben will fail right at the edge of the patch. Tapering may help spread the force over a larger area, resulting in a stronger connection.
I'll post test results in this thread, with a link to my earlier tests. As this one builds on what we learned earlier, it make sense to sticky this thread, adding new information as it appears.