Engineering Stack Exchange
Engineering Stack Exchange

Questions tagged [thermal-expansion]

27 questions
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How to calculate the adhesion I need to keep a 3D printed bending part straight?

3D printed parts cool down during printing, resulting in thermal contraction which causes a bending moment and separation from the printing bed. The issue is solved by increasing adhesion to the printing bed, which however results in more stresses…
FarO
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Do bolts become tighter or looser at cryogenic temperature?

In general, will screws tightened at room temperature become tighter or looser at very low temperature (5 K)? On the one hand, the screw should loosen because it will contract radially, while the surrounding material will contract slightly less (or…
ninemileskid
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Relating internal stress of an o-ring due to thermal expansion to amount of free volume in a gland

I am trying to come up with an analytical way to determine the optimal gland size that an elastomer o-ring will sit in. The amount of free space in the gland is determined by the thickness of two backup rings that surround it. Thus, the thicker the…
LSUEngineer
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Are there any cold-expandable materials of significant expansion factor?

There are thermo-shrinking plastics, commonly used in electronics, which stay shrunk after cooling down. There are thermally expanding foams. The closest to 'expanding when cooled' I know is water, with ice expanding, but only by a small margin, a…
SF.
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Why Heat Exchangers are preferred to work in Constant Pressure Process than Constant Volume Process?

Why Heat Exchangers are preferred to work in Constant Pressure Process than Constant Volume Process? Mostly, all problems are solved in Constant Pressure Process
Pradeep Somasundaram
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Expanding a small rubber ring

I have a bunch of small rubber rings that I need to conduct testing on. The rings start at about 15mm ID, and need to expand to 65mm and be held there for months. Right now, my solution for expanding the rings is using a tapered beam which increases…
Georgije Stanisic
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Calculating Bending Force on a Fixed Metal Plate

At work we've had a steel pipe support break on us, and I can't for the life of me figure out what happened. Here's some background info: A long (125m) steel heating pipe (ø51mm) is suspended, resting on 27 identical supports over its total length.…
Marty
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Can we use an open expansion tank in solar water heating system?

We all know that in an indirect (closed loop) hydronic system, an expansion tank is needed ,to deal with thermal expansion of the circulating water, that can be either open expansion or closed expansion tank however I've mostly seen indirect solar…
moeinSj
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Direct Optimisation - How to Create Time Efficient Study

I made a simulation of this cylinder that is being suspended mid air and held up by 8 rods, 4 on top and 4 on the bottom. The entire model is cooled to 15K I managed to find the forces required for 6 of the rods to have a safety factor of above 1 as…
General Stubbs
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Thermal expansion of a hole in a plate with a temperature gradient

I have a rectangular metal plate with a hole in it (with diameter of 300 mm). The plate has a temperature gradient going from one of its short sides to the other, I can measure the temperature anywhere in the plate. I want to compute how much the…
Ricardo Magallanes
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Temperature of a material in a furnace

I am conducting few trials for checking the placement of a thermocouple on a valve for measuring the temperature of the valve and the material is an X45 alloy. You can see the slot taken on the valve and the thermocouple is inserted in the slot…
Vish_evo
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Process changes in mechanical copper parts (stress relief)

Having some issues with assemblies, I try to explain my question with some introduction. Let's say, there's an assembly with two parts. Copper (OF / K30) and FR4. The copper part is milled from all sides extensively. In the process both parts are…
Ariser
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Axially loaded member with a spring / Mechanic of Materials

i've been struggling with this problem i made up. It is about a cylindrical copper member (diameter $d=20$ mm and length $L=250$ mm) with a spring (stiffness $k=166,5$ kN/mm) fixed on a wall, as the figure shows: The copper member, initially at $20…
maxipoblete
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Thermal expansion during the course of melting (in metals specifically)

The question is with regards to Thermal Expansion at the point of melting. My basic understanding is that a material will generally undergo linear thermal expansion until some phase change occurs (crystal formation, melt, etc) that changes the…
Trevor Buckner
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Structural analysis + thermal expansion using ANSYS static module

I am attempting to model a steel sample subjected to combined mechanical and thermal loading. The thermal loading can be quite elevated, where reduction in the elastic modulus will occur. Does anyone know if ANSYS's static structural module…
roulette01
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