Quote:
Originally Posted by Chrisyphus
If we had bonded the Aluminum to the carbon, it would have been a minor concern across 100*c you can expect the material to expand ~2.3 mm
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U = alpha* DelT*Uo
Uo = 36” = 914.4 mm, for assumed plenum width (should be distance between F-R sided trumpets or the long length of the lexan window)
U = 2.3 mm (quoted thermal deformation)
DelT = T - Tref = 100 C, T =120 C. Tref = 20 C (room temperature)
So CTE is alpha = U / (DelT*Uo)
= 2.3 / (120*914.4) = 251.6 ppm/C
Note: CTE would be even higher if a correct, shorter, length was used in the calculation
Which material has a CTE of 251.6 ppm/C? CF CTE is (likely negative and) on the order of 0.1 ppm/C. You’d have a potential CTE mismatch problem between this material, the structural adhesive, and the CF, if the CTE or deformation at 120 C are correct.