The discussion revolves around the use of carbon fiber fabric in conjunction with various adhesives to strengthen a fragile plastic piece. Participants explore the effectiveness of different types of glue and the structural properties of carbon fiber in various applications, including repairs and reinforcement techniques.
Participants express a range of viewpoints regarding the best adhesives for carbon fiber applications, with no clear consensus on a single approach or adhesive type. Some methods and materials are discussed, but the effectiveness and suitability of each remain contested.
Participants note that the bonding effectiveness of adhesives can vary significantly depending on the type of plastic used, indicating that assumptions about compatibility may not hold universally. Additionally, the discussion includes personal experiences that may not be generalizable.
Carbon fibre has good tensile properties, so it is best wrapped around an outer convex surface where tension forces in long fibres will not cause delamination. Internal concave surfaces tend to be compressive so it is the glue or filler that will be more important, held in place by short fibres as reinforcing.kolleamm said:I have a fragile plastic piece and I would like to coat the inner walls with carbon fiber, ...
I do the same thing with carbon fibers and high strength low viscosity epoxe. If the epoxe bonds well to substrate (always a crapshoot with plastic) the result is remarkably strong.Baluncore said:Carbon fibre has good tensile properties, so it is best wrapped around an outer convex surface where tension forces in long fibres will not cause delamination. Internal concave surfaces tend to be compressive so it is the glue or filler that will be more important, held in place by short fibres as reinforcing.
Small plastic items break after becoming brittle with time. I sometimes repair them by reassembling the parts with cheap superglue. Then I wind a Kevlar fibre around them, backwards and forwards to make a very thin outer sock of cross-hatched thread. One drop of fluid superglue on the Kevlar wicks through to make a very strong exoskeleton. The superglue, = cyanoacrylate, chemically bonds with the Kevlar, = aramid.
I get the Kevlar fibre from scrap cable. Make sure you are not touching any fibres as the superglue wicks in, or you will very rapidly become part of the exoskeleton.
Maybe de-water the soil around your basement. If you have a sump pump there, the perforated pipes that run around the foundation may have collapsed/filled with stuff, raising the water table.hutchphd said:...70 year old block basement walls which had started to bow a bit...small gaps in the horizontal mortar lines.
Actually I had recently had a galvanized intake water pipe replaced which clearly created some leakage and backup outside. This likely caused the issue but is copacetic now. Vertical carbon fiber has made wall rock stable. Good call, thank you!Tom.G said:Maybe de-water the soil around your basement. If you have a sump pump there, the perforated pipes that run around the foundation may have collapsed/filled with stuff, raising the water table.
Many plumbers can send a video camera thru the pipe to check for blockages. Not cheap, but cheaper than a collapsed wall.