Rivet Sizing

[john9786]

I had been taught early in my career repairing jets to determine the rivet diameter to use based on the material thickness to be fastened. Normally, rivet diameter is one gauge higher than the stack-up. DERs also normally required this except for special situations.
My question: where does this guidance come from? Is it just hand me down information, or a "best practices" or rule of thumb?

Thanks

 

[rb1957]

my 2c, i understand your use of "one gauge higher than stack up" to mean the t/d = 1, ok close to one, d>t. this seems excessive in my experience, t/d < 4 is acceptable, > 6 is suspect, > 8 decidedly dodgy. i might look up design practice manuals tomorrow.

 

[bf109g]

Boeing criteria -

2.3 Rivet Size Selection

a. Rivet diameter should be equal to or greater than the
thickness of the thickest part in the joint and less than 3 ×the thickness of the thinnest outside part.

b. If the assembly thickness (stackup) exceeds 2.5 × the rivet diameter, increase the rivet diameter or use another type of fastener, such as hex–drive fastener or bolt and nut.

c. For fluid–tight applications, maximum assembly thickness
(stackup) should not exceed 2 × the rivet diameter.

 

[stilljustbrowsing]

The rivet size is specified in the SRM, sometimes you can increase rivet diameter if for example the original rivets were DD, but you want to use AD. Thats not so bad if the rivets are universal head. If the required rivets are to be countersunk, then obviously, material thickness needs to be taken into consideration.

 

[SAITAETGrad]

NACA TN 942.