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Why the thermal stress changed over time with the temperature was keeping the same?

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The details as follow:
Attach file gives the thermal stress and the temperature changed over time at the same point.
Figure 1: thermal stress over time
Figure 2: temperature over time

I don't know why Figure 2 is a line, but Figure 1 is a curve with some pulsation.

thermal stress=alpha*(T-Tref), alpha and Tref are both constants, if T is keeping constant, why the thermal stress changed?

Thank you very much! Any advice is appreciated!

Yajuan


1 Reply Last Post 11.08.2011, 01:10 GMT-4

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Posted: 1 decade ago 11.08.2011, 01:10 GMT-4
But the thermal stress doesn't change : 49MPa. Look the axis.
But the thermal stress doesn't change : 49MPa. Look the axis.

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