THERMAL EXPANSION CALCULATOR
Thermal expansion is normally calculated in two ways, as a linear (single dimension) or volumetric (3 dimensional) measurement. Depending on the case, each method is useful, as finding out how a beam would extend due to heat would only require a linear method, however when trying to find out how a body of liquid expands with temperature, volumetric might be best.
Linear Thermal Expansion Calculator
Linear Thermal Expansion is calculated using the following formula:
L = Initial Length
ΔL = The change in Length
αL = Coefficient of Linear Thermal Expansion
ΔT = Change in temperature
Linear thermal expansion is the most common calculation used to estimate the expansion caused by a change in temperature. The Coefficient of Linear Thermal Expansion is commonly displayed as a product of a length/length temperature unit. as this is the case, the unit of length does not matter provided both units of length are the same. Once you have your coefficient, you need the length of the expansion to be measured, and the temperature range for the scenario, put it all into the calculator and go!
Volumetric Thermal Expansion Calculator
Volumetric Thermal Expansion is calculated using the following formula:
V = Initial Volume
ΔV = The change in Volume
αV = Coefficient of Volumetric Thermal Expansion
Volumetric Thermal Expansion is calculated in a very similar fashion to Linear expansion, only with measurements of volume, not length! Coefficients of Volumetric Expansion are proportional to Linear coefficients, being triple the value of linear expansion, so its easy to convert from one to the other if you cant find the correct coefficient.
Area Thermal Expansion
Area Thermal Expansion is calculated using the following formula:
A = Initial Area
ΔA = The change in Area
αA = Coefficient of Area Thermal Expansion
As with linear it Area Expansion is calculated the same way as above, normally double that of linear expansion.
Table Of Thermal Expansion Coefficients
|Thermal Expansion of Common Materials|
|Material||Coefficient of thermal expansion (CTE)||Reference|
|Low Carbon Steel||10.1 - 14.9||30.3 - 44.7||Matweb|
|High Carbon Steel||9.9 - 14.8||29.7 - 44.4||Matweb|
|Stainless Steel (316)||18.5||55.5||Matweb|
|Aluminium (pure)||23.6||70.8||Chicago University|
|Water (293 Kelvin)||69||207||efunda|
|Water (277 Kelvin)||0||0||University of Oregon|
|Brass||18 - 26||54 - 78||Matweb|
|ABS||60 - 100||180 - 300||Roechling|
Important Notes for Thermal Expansion Calculations!
Its important to remember when using thermal expansion coefficients, figures quoted are normally at 20°C, its important to know the coefficients vary with temperature! for example, thermal expansion of water is a curve, with centre at approximately 4°C. At this point, the thermal expansion is zero, however either side the expansion coefficient increases. In most cases, the difference is very small, but worth checking, especially near the melting point of the material.