"Wrong."
No. Your own data shows there is not a 15% energy difference between 60 F
and 70 F. It would be only 4.2% to 4.8%. My slope parameter would be 0.57%/C
compared with your values of 0.76 and 0.86, differences due to the different
batches of rubber. I assumed a 15 F difference between low 60's and high
70's to get a 4.7% difference in energy.
The 17% difference between 60 F and 70 F has no physical significance. The
absolute temperature increase is 1.9%. The energy % increase is not the same
because of the nonzero intercept. What were your intercepts?
I have seen data that shows a linear relationship between tension and
temperature from -60 C to +60 C at an extension ratio of 3.5. This is as it should
be, since tension is an effect of heat. A similar relationship holds for
energy. I would assume a similar relationship holds for torque. There is a
break point at -60 C and the line goes up with decreasing temperature from
there.
Treloar, "The Physics of Rubber Elasticity", Fig. 2.1.
Gary
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Received on Mon Feb 26 2007 - 04:54:01 CET