Edge distances in steel

[Ed Wischmeyer]

Folks -

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

thanks

Ed

[Stephen Mitchell]

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

[Bill Chernoff]

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

Bill

[smjmitchell]

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