# Howd do Young's modulus and Rs change with temperature?

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Is there some empirical/theoretical equation or table to determine how Young's modulus and plastic yeld strength are affected by temperature (for cast iron and steel)?

Any pointers or suggestions will be appreciated.

TIA

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If you browse for variation in Youngs modulus with temperature, you see hits on shape memory alloys, plastics, fabrics, and to a smaller extent in metals. Here's an abstract for single crystal nickel. You will find something of the same kind for brass, etc.

"A new method is described for the measurement of Young's modulus and its variation with temperature below 400°C. The method is applied to single crystals of pure nickel and to hard drawn, polycrystalline, commercial nickel between 30°C and 400°C. The variation of Young's modulus with temperature in these substances depends on the previous thermal history of the sample. Between 30° and 200° Young's modulus for annealed specimens decreases about 13 percent. This is followed by an increase to the Curie point of about 6 percent and above the Curie point by a linear decrease. For hard drawn specimens and specimens quenched at 1100° the minimum is wholly absent. Young's modulus decreases continuously to the Curie point, where the temperature coefficient changes abruptly."

There is a very rough rule of thumb for metals that yield strength drops as a fraction of ambient temp vs melting temp in absolute values.

Brian Whatcott Altus OK

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What do you mean by plastic in plastic yield strength? I have only seem that used with plastic bending strength at yield.

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Probably the strength that is threshold for plastic deformation, whether bending, torsion, or simply tension.

David A. Smith

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Using both plastic and yield in that context is unneccasary and redundent.

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What, you don't like double positives? ;>)

David A. Smith

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Hi, The theory you can find in Landau textbook. I remember, that was one of my questions at theoretical physics written exam. Good luck, Alex

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"N:dlzc D:aol T:com \(dlzc\)" wrote in news:bGyFf.24994\$jR.17334@fed1read01:

Well, word-jokes work better when they are spelt correctly

Cheers

Greg Locock

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Interesting, some Middle English.

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Jeff Finlayson wrote in news: snipped-for-privacy@news.boeing.com:

Not necessarily, just a joke-ette!

Cheers

Greg

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