Thermal Expansion of a shrink-fit collar

AI Thread Summary
A shrink fit collar operates on the principle of thermal expansion, where heating the collar causes it to expand, allowing it to fit over a shaft. Upon cooling, the collar contracts, creating a tight grip. The discussion addresses a common question regarding the expansion of materials: while heating causes expansion in all directions, the geometry of the collar means that the inner diameter does not decrease significantly. Instead, the outer dimensions expand more than the inner dimensions, allowing for a proper fit. The conversation also touches on the mathematical relationships between the collar's circumference, thickness, and radius changes due to heating, emphasizing the need for precise calculations to understand the extent of these changes.
akip
Messages
2
Reaction score
0
Looking for some information on how a shrink fit collar actually works. I get the basic principle that you heat it, it expands, fit the collar, let it cool and it contracts and grips as a collar.
However, if you heat a material am I right in saying that it expands in all direction. If this is true, then when heating a ring, why doesn't the hole in the collar actually get smaller with expansion, i.e. the material is expanding inwards as well as outwards.

Cheers
Akip
 
Engineering news on Phys.org
If C is the circumference of the collar and t is the thickness of the collar (t<<C), how much does C increase and how much does t increase? How much does the average radius increase? How much does the inner radius increase?

Chet
 

Thread 'How could I make it so ferrofluid drops do not coalesce?'

Hello! I've been brainstorming on how to prevent a lot of ferrofluid droplets that are in the same container. This is for an art idea that I have (I absolutely love it when science and art come together) where I want it to look like a murmuration of starlings. Here's a link of what they look like: How could I make this happen? The only way I can think of to achieve the desired effect is to have varying droplet sizes of ferrofluid suspended in a clear viscous liquid. Im hoping for the...
View full post »

Thread 'How do you fabricate microfluidic chips in your lab?'

Hello everyone! I am curious to learn how laboratories handle in-house chip manufacturing using soft lithography for microfluidics research. In the lab where I worked, only the mask for lithography was made by an external company, whereas the mold and chip fabrication were carried out by us. The process of making PDMS chips required around 30 min–1 h of manual work between prepolymer casting, punching/cutting, and plasma bonding. However, the total time required to make them was around 4...
View full post »

Similar threads

B New Theory Explaining Why Certain Alloys don't change size when heated
Replies
1
Views
2K
A commonly available material exhibiting reasonable expansion/contract
Replies
3
Views
3K
What are the causes of thermal stress?
Replies
8
Views
2K
B Question regarding Heat Transfer in Carnot Engine
Replies
1
Views
2K
I How to measure average thermal conductivity of a metallic material?
Replies
1
Views
1K
Thermal expansion: the amount of material expanding is "irrelevant"?
Replies
7
Views
8K
Does the Coefficient of Thermal Expansion Apply to Both Expansion and Contraction?
Replies
19
Views
7K
I A paradox about energy balance and steady state
Replies
2
Views
2K
I Calculating Cooling Effect in Gas Cylinder Expansion
Replies
3
Views
4K
Thermal Dynamics - Ring Heated Up
Replies
11
Views
1K

Hot Threads

Recent Insights

Back
Top