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thermal expansion diameters

thermal expansion diameters

thermal expansion diameters

(OP)
Can anyone point me in the right direction?
I need to calculate thermal expansion
of a shaft and a bushing with two different
materials.






RE: thermal expansion diameters

Try looking up "Coefficient of Thermal Expansion" on www.wikipedia.org

This will give you equations and some basic coefficients needed for different materials.

RE: thermal expansion diameters

(OP)
Wikipedia doesn't explain it very well.
So this is how I understand it....
shaft od = 1.375 made of gray iron
coef of thermal expansion 5.8
heat 600c  or 1112F

od x coef x 10-6 x 1112
so

1.375 x 5.8 x.000001 x 1112 = .0088
so the shaft expands .0088
Is this correct?
Does work the same for an inner diameter?


RE: thermal expansion diameters

Almost correct. You calculate the thermal expansion based on the temperature difference.  Usually from room temperature, 70 F.  Therefore the calculation should be alpha x (T2 - T1) x length = 5.8 (10-6)in/in F x (1112 - 70)F x 1.375 in = 0.0083 in.  Take note that all dimensions increase as temperature increases, ID, OD, length, etc.

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