Copper Yield Strength

[dcopps]

I am searching for data showing yield strength for oxygen-free copper from room to elevated temperatures (up to and including melting point). I have looked in the ASM Handbooks and other sources here and have not been able to find it. Thanks.

-Dale C. (Library manager)
Creare, Inc.

 

[unclesyd]

I would changes the paraments of your search to OFHC (Oyygen Free High Conductivity Copper.

http://www.google.com/search?source...rlz=1T4GGIH_enUS245US245&q=OFHC+copper++yield

These people have a lot of information on all Copper Alloys.

http://www.copper.org/

You might want to contact the Linda Hall Library as there was a tremendous amount of information on the various coppers from the old Annaconda Co.

http://www.lindahall.org/

 

[btrueblood]

What unclesyd said, and more:

(direct quote from MIL-HDBK-5): The thermally unstable range for copper and its alloys begins somewhat above room temp (150 C). Creep, stress relaxation, and diminishing stress rupture strength are factors of concern above 150 C.

Translated, that means that above 150 C, copper has a time-dependent plastic deformation behavior, and a "traditional" yield strength loses meaning as the temperature gets higher than that. Kinda like asking for the yield strength of taffy. You can extrapolate creep data to short time durations to get a somewhat meaningful "yield strength" number, but ignoring the time dependent behavior doesn't make it go away.

You may find more information by searching for creep, stress relaxation, and rupture data on OFHC copper. A quick Google using terms "creep OFHC copper" gave quite a few hits including these:

http://cat.inist.fr/?aModele=afficheN&cpsidt=2226169

http://nvl.nist.gov/pub/nistpubs/jres/045/2/V45.N02.A06.pdf

http://de.scientificcommons.org/18664975

The second link above gives a 1950's NIST report with a lot of data up to 350 F for OFHC copper creep.

 

[EdStainless]

Yes, the men are right. There is no such thing as traditional yield strength for pure Cu above room temp. In fact testing can be fun since you will be getting recrystalization during the test.

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