NI SPAN C ALLOY 902 1

[dho]

this is constant elastic module E alloy. how about the torsional module G ?
thanks.

 

[metengr]

The tensile modulus of elasticity ranges between about 24 to
29 x 10³ ksi, depending on the processing. Torsional
modulus range is about 9 to 10 x 10³ ksi.

from

http://www.specialmetals.com/assets/documents/alloys/other/ni-span-c-alloy-902.pdf

 

[dho]

thanks.
but specialmetals talks about how to make E constant. did not talk how to make G constant.
my question is, will a coil compression spring to have a consistant load over temperature when made from ni span c ?

 

[metengr]

Call Special Metals and discuss with them.

 

[dho]

Special Metals no longer manufactures this alloy. The only information I can offer is that in the attached bulletin.

(the same thing as you quoted.)

Regards,

Lew Shoemaker
Application Engineering & Business Development
Special Metals Corporation

 

[metengr]

Try this reference Figure 59

http://www.dtic.mil/dtic/tr/fulltext/u2/474255.pdf

 

[EdStainless]

Since E and G are related to each other they must have the same temperature dependence. Both are really components of K bulk modulus (compression modulus).
Spring people know this since coil springs are designed based on G, but one ever measures it because it is related to E.

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P.E. Metallurgy, Plymouth Tube