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posted by  mojomao on 11/2/2009 12:33:23 PM  |  status: Live  |  Earned Karma: 92

Which material needs to have a higher thermal expansion for this to work?

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Mechanical Engineering N/A N/A N/A 11/3/2009 at 10:00:00 PM
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 An apparatus consisting of a rod (made of material A) placed inside a tube (made of material B) must be fabricated so that the rod fits tightly into the tube at room temperature. One way to do this is through the process of cold welding in which both pieces are cooled in liquid nitrogen and the rod then fits loosely into the tube. Upon warming to room temperature, the fit is tight. Which material needs to have a higher thermal expansion for this to work? Why?

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posted by Anonymous on 11/2/2009 1:21:33 PM  |  status: Live
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When the metals are cold, the inner rod fits in easily. When brought to room temperature, the inner rod expands to fill the void in the tube. What happens if the rod expands more than the tube? What happens if the tube expands more than the rod?
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