SHEAR MODULUS AISI 316 2

[alegr]

Which is the shear modulus for a spring made from AISI 316 ?

 

[israelkk]

7042 kgf/mm2

 

[TVP]

Moduli and strengths are most appropriately given in units of stress, i.e., N/mm², MPa, GPa, etc. The value that israelkk provided converts to 69 GPa.

 

[CoryPad]

Allegheny Technologies lists the shear modulus for 316 stainless steel as 82 GPa. You can learn more at:

http://www.alleghenytechnologies.com/ludlum/pages/products/products.asp

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[TVP]

I did some more investigation, and it appears as though the elastic modulus G varies depending on product form. Both Allegheny and AK Steel (see link below) give higher values for G, 82 GPa and 77 GPa respectively, but they produce flat products like sheet, plate, & strip not long products like bar and wire:

http://www.aksteel.com/pdf/markets_products/stainless/austenitic/316_316L_Data_Bulletin.pdf

Now, all spring references that I checked (SMI Handbook, SAE HS 795, Rockwell Mechanical Spring Design Guide, etc.) use the value of 69 GPa or 11 x 10⁶ psi for the value of G for austenitic stainless steels like Type 316. This is confirmed by some European spring wire producers of Type 316 (EN 1.4401) like Ugine and Sandvik:

http://www.uginesavoie.fr/system/online/sources/Documents/Sprint/data/smre55.pdf

http://www.smt.sandvik.com/sandvik/0140/internet/se01598.nsf/cdatas/745255A2F11E97D3412566AB0043F2C6

Also note that the strength and moduli increase after tempering, so the value of 71 GPa is probably the most appropriate design value for a spring using Type 316 wire.