When using bolted assemblies to join parts, the coefficients of thermal
expansion (CLTE) of the different materials being assembled have to be taken
in to consideration in the design. Since the CLTE for most plastics is greater
than that of steel, loosening of the assembly at low temperatures and
tightening of the assembly at high temperatures occurs. Under extreme
conditions (very high temperatures), the compressive stresses in the plastic
may increase above the yield strength due to the plastic expanding more than
the bolt.
Please click here for information on
thermal expansion calculations for tightening bolts.
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