Holes in parts will NEVER shrink from heat. They will always expand.The following explanation is not my answer. But it explains it very well so I'll post it.Assuming the disc is uniform and isotropic (the same in different directions), the hole will expand in the same ratio as the metal. You can see this because the thermal expansion equationapplies to all lengths associated with the metal, including the circumference of the hole, since the edge of the hole is made out of metal. And if the circumference of the hole expands, so does the diameter.Instead of a circular hole, let's think of a square hole. You can get a square hole two ways, you can cut it out of a complete sheet, or you can get one by cutting a sheet into 9 little squares and throwing away the center one. Since the 8 outer squares all get bigger when heat it, the inner square (the hole) also has to get bigger:This is confusing to people because the primary experience they have with stuff getting larger when heated is by cooking. If you leave a hole in the middle of a cookie and cook it, yes, the cookie gets bigger and the hole gets smaller. But the reason for this is that the cookie isn't so solid. It's more like a liquid, it's deforming. And as Ilmari Karonen points out, the cookie sheet isn't expanding much so there are frictional forces at work.
You can find more information on our web, so please take a look.
Spend more time working on your project and less time shopping for the products you need to complete it. Place an order online by 5 pm for pick up that day. We offer in-store pick up as well as touchless curbside pickup.
Link to Cell Instruments
Shop Specials If you want to learn more, please visit our website HAST-01 Hot Air Thermal Shrinkage Tester.