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The thermal linear expansion coefficient is positive when the material expands do you expect it be negative when the material contracts?
Wiki User
∙ 15y ago
The coefficient remains positive, but the dT used will become negative, yielding a negative growth (ie, a contraction). See the equation below:
dx = L * a * (Tactual - Tref)
Where,
L is the starting length
a is the thermal expansion coefficient
Tactual is the temperature you're evaluating at
Tref is the reference (or starting) temperature
If Tactual < Tref, then the quantity (Tactual - Tref) < 0
Wiki User
∙ 15y ago
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