Thermal Expansion of 2 attached metals

In summary, the conversation discusses the concept of thermal expansion and its effect on two attached metals when heated. The question is whether the metal will curve downwards or upwards, assuming the one with the higher thermal expansion is on top. Further details such as the method of attachment, which metal is heated, and the coefficients of expansion are needed for a complete solution.
  • #1
audilover
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Homework Statement



This is more of a concept that I am confused on.

IF there are 2 metals, one on top of the other, and they are attached to each other and attached to a wall, and the only thing different between the two metals is the thermal expansion. When heated will the metal curve down or upwards?


Homework Equations





The Attempt at a Solution



Assuming the metal with the higher thermal expansion is on top, I thought it would curve towards the smaller thermal expansion, which would be downwards.
 
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  • #2
Attached how? At fixed points or are the metals welded along their interface? Which metal is heated? What are the coefficients of expansion? Is the temperature near the melting point of one or both metals (will their be sag not related to thermal expansion/contraction)?
 

FAQ: Thermal Expansion of 2 attached metals

What is thermal expansion?

Thermal expansion refers to the increase in size or volume of a material when its temperature increases. This is due to the increase in kinetic energy of the particles within the material, causing them to move further apart.

How does thermal expansion affect 2 attached metals?

When two metals are attached, their thermal expansion coefficients must be taken into consideration. If the metals have different coefficients, they will expand or contract at different rates when heated or cooled, which can cause stress and potentially damage the joint.

What are some factors that can influence the thermal expansion of 2 attached metals?

The thermal expansion of 2 attached metals can be influenced by the composition and structure of the metals, as well as the temperature range they are exposed to. Other factors such as pressure, stress, and the presence of impurities can also affect thermal expansion.

How is thermal expansion of 2 attached metals calculated?

The thermal expansion of 2 attached metals can be calculated using the equation: ΔL = αLΔT, where ΔL is the change in length, α is the coefficient of thermal expansion, L is the original length, and ΔT is the change in temperature. The coefficients of thermal expansion for different metals can be found in tables or can be measured experimentally.

How can the effects of thermal expansion be minimized in 2 attached metals?

To minimize the effects of thermal expansion in 2 attached metals, it is important to choose metals with similar coefficients of thermal expansion. Additionally, joints and connections should be designed to allow for some movement and flexibility to accommodate any changes in length or volume. Thermal insulation can also help to reduce the temperature difference between the two metals and lessen the effects of thermal expansion.

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