Copper Pipe - Strain Hardening?

[cnuk]

I am going to try hydroforming a copper water pipe into a new shape. My question is, how much will standard copper water pipe strain harden when formed? I looked and in Canada the spec is ASTM B75-C12200. My info says that is 99.9% pure copper.

Does anyone have any ideas of the hardening of copper pipe? I am running some FEA to predict the pressure required for forming and it is very dependent on the hardenability of the pipe.

Thank You

 

[MintJulep]

http://www.copper.org/

 

[cnuk]

I've looked at copper.org and they don't give detailed stress vs. strain data, which is what I am looking for. Tensile and Ultimate is not enough for building a material model.

 

[metengr]

From the references that I have, here is some strain hardening data at ambient temperature for copper ( these values are picked off from graphs - the source is from a Materials Engineering lecture series),


UTS (Ksi)

30 @ 0% CW
40 @ 10%
50 @ 30%
53 @ 50%
58 @ >60%

YS (Ksi)
25 @ 0% CW
30 @ 10%
40 @ 30%
49 @ 50%
52 @ >60%

 

[cnuk]

The missing information is what strain level the ultimate strength occurs at. Without this I cannot create a stress vs. strain curve. That's the million dollar question.

Thanks to all for the information provided.

 

[metengr]

The data posted above contains this information. Above 60% cold work, the ultimate tensile strength levels off at 58 Ksi. What more do you need????

Percent cold work is expressed as a percentage of strain deformation.