|Quoting MCIGuy (Reply 4):|
Ah, I see, so it's akin to to using a larger bolt or a helicoil when you strip a bolt. So if the hole gets too big they'd just back it with a CFRP or metal plate?
Basically, yes. The SRM (structural repair manual) normally specifies how many oversizes you can do an, if you go past that, there are standard doubler repairs. A doubler is a just a backing (or fronting, depending on your you assemble it) plate that carries the load over the area you can't repair. It's very commonly used for small dents, dings, puctures, bad holes, etc.
|Quoting Soon7x7 (Reply 5):|
You believe that composite repairs will be less expensive that sheet metal repairs?...if so , how and why?...j
Not less expensive, less of them. CFRP is almost immune to corrosion and fatigue, which are two of your big drivers on structural repair. Ramp rash is obviously more of an even thing but there are some great impact-resistance demos for CFRP so I don't see this being particularly worse. Boeing has stated (several times) that they can use conventional repairs for ramp rash, so the cost should be the same.