Edge distances in steel

Folks -

How many diameters of edge distance do you need in steel? I know it's 1.5
in aluminum.

thanks

Ed

There is no definite rule (as is also the case for alumnium). It depends on
the stress levels in the part.

In general MIL-HDBK-5 provides data for e/D = 1.5 and 2.0. Unfortunately the
copy I have handy right now (which is Rev F) does not have any data for e/D
= 1.5 for 4130N. However the data for other steels indicates that you could
have a 20%+ reduction in strength when using e/D = 1.5 cf e/D = 2.0.

I would use 2.0 unless you know what the stresses, can source some
allowables for e/D = 1.5 and have run the numbers to show that you have
adequate margins.



"Ed Wischmeyer" wrote in message
news:2004082215291516807%edwisch@alummitedu...
Folks -

How many diameters of edge distance do you need in steel? I know it's 1.5
in aluminum.

thanks

Ed

ok I'll bite. What's an "edge distance"?

Bill

The distance of a fastener hole from the edge of a sheet of materials.

Edge distance is measured via and e/D ratio (minimum is typically 1.5 - 2.0)

e = distance from centre of hole to sheet edge.
D = diameter of fastener.

"Bill Chernoff" wrote in message news:aPKWc.197841$M95.174071@pd7tw1no...
ok I'll bite. What's an "edge distance"?

Bill