ThermalEffects-6

ThermalEffects-6 - Thermal Effects Thermal effects for...

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Thermal Effects KML 9/1/09 Thermal effects for unconstrained objects Parts that are made of all types of materials change dimensions with temperature if they are not constrained. The sensitivity of thermal expansion to a given change in temperature is characterized by the coefficient of thermal expansion (CTE), which may be denoted as α . The change in dimension of an unconstrained homogeneous material for a temperature change is T L L α = δ where: α is CTE, typically expressed as ppm/ ° F or ppm/K, where ppm means 6 10 - L δ is the change in length L is the initial length (or width or height or diameter or…) i f T T T - = is the temperature change, or final temperature minus initial temperature ) T 1 ( L L L L f α + = δ + = : final length is initial length plus change in length These equations hold for any dimension: length, width, height, diameter, etc. Example Specify the final diameter of an aluminum piston at 300 ° F that has a diameter of 4.000 inches at 20 ° F (use five significant figures).
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ThermalEffects-6 - Thermal Effects Thermal effects for...

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