Rivets

[Guest]

The strength of a rivet assembly is predicated on the most highly stressed rivet. The calculation of joint strength in rivet assemblies is very difficult.

The shaving of one rivet THAT WAS NOT DESIGNER TO BE SHAVED! can lead to failure at that point premature to the expected loads in a new structure, it is more likely in an old one where some grip retention had diminished.

Riveted assemblies that are designed with rivets that are designed to be shaved have different rivet spacing, or designed to a different load path or use base sheet gage designed to hold the rivet. This months (April) Advanced Composite Mag has a good analysis of rivet pull through testing.

Also note if the wing is truly laminar flow. oh and before you think otherwise, NO GA wing designed before say 1990 is really laminar flow beyond say 20to 30% chord, it would have beedesigneded with flat rivets or bonded. This is NOT to say all bonded or flat riveted assemblies are laminar flow. In the case of the Tiger wing the bonded structure was for cost consideration. In the case of RV'Becausese flat rivets look cool.

THere is a good reason paintjobs on aircraft cost bucks. Aircraft are hard to paint, do not think it is easy.





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[n76lima]

The FAA quick inspection standard for rivets being degraded during paint or maintenance is if the dimple in the head of the standard AN470 domed head rivet is worn away. If so, the Inspector may ask that you replace any that have the heads worn down.

This is all too easy to do with a sander, and is to be studiously avoided!

Drilling out and bucking one or two rivets is a hassle, but not inordinately expensive,etc.

Drilling out ROWS and ROWS of rivets and replacing them could get REAL expensive and in some cases require CherryMax replacements rather than driven rivets, given the difficulty, or impossibility, or reaching the back side to buck them.

--Bob Steward A&P IA
Birmingham, AL


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