Young's vs. temperature

[baxterl]

Hi again,

Anybody got any info on the temperature variation of Young's modulus in stainless?

...L

 

[metengr]

Yes.
At about 70 deg F 28.8 X 10 ⁶psi
140 deg F 28.2 X 10 ⁶psi

 

[unclesyd]

Do you need a value at a specific temperature?

Do you need the value for shear or tension?

 

[baxterl]

Hi,

We need to compensate 0 to 60degC, so however many temperatures gives us a nice curve fit.

Tension alone will work...

...L

 

[metengr]

The two data points mentioned above will work. They are from an actual graph of Young's Modulus in tension for Austenitic stainless steels. At 0 deg C,this is 32 deg F and at 60 deg C, this is 140 deg F. You can interpolate your specific values between these temperatures (there is little to no change in Modulus between 32 and 70 deg F).

 

[unclesyd]

Adding to metengr's information.
316 SS

27C 28.0 x 10^6

93C 28.1 x 10^6

149C 27.5 x 10^6

304 SS

27C 28.0 x 10^6

93C 27.9 x 10^6

149C 27.1 x 10^6

 

[baxterl]

Hmmmm.

From your data, I get (1-28.0/27.5)*1/122degC, or 148ppm/degC.

From metengr I get (1-28.8/28.2)*1/70degF, or 304ppm/degF, 170ppm/degC.

From a graph in "Elevated Temperature Modulus Measurements using the Impulse Excitation Technique (IET)", I get 315 ppm/degC.

Throw out the outlier and average to 159ppm/degC?

...L

 

[metengr]

Yes, that would be a reasonable approach with the data.

 

[EdStainless]

I also have a bunch of good data for E vs temp.
The problem that I have is that differences in published E values are huge (+/-10%).
If you really need to know, then you need to make some measurements yourself. Most published data is looking at large ranges.
The way that your parts are made and the exact composition will have an impact down at this level.

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[baxterl]

I guess.

http://www.outokumpu.cz/documents/1042EN2_Steel Grades_Properties.pdf

shows 434ppm/degC, so the data is not 10% but 300%. Strange, as Young's is one of the more stable, process-resistant, alloy-resistant properties of metal...

...L

 

[arto]

Look in the ASME B&PV Code Sec. II subpart 2 - they have Elasticity vs. Temp for all kinds of alloys [thermal expansion & conductivity too]

 

[EdStainless]

The Code info is way too rough for this application. There is very good data on spring wire, but the modulus is different for wire than for other product forms so you may not want to use it.

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Rust never sleeps
Neither should your protection

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