Questions tagged [thermal-expansion]
The thermal-expansion tag has no usage guidance.
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Thermal expansion of a Hollow shaft
Hi I am designing bearings for the Paddle dryer assembly with an inclined hollow shaft. Although I have calculations for a solid steel shaft, unable to find reference of thermal expansion for a ...
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Stress Strain Analysis In Wall
I have a 20mm thick and 10m long wall. On one side of this wall (inner) is 80 degree celcius water, the outer side is air at an ambient temp of 20 degrees celcius. My coeff of thermal expansion is 15e-...
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Using thermal expansion to "passively" realign solar panels
Can one use thermal expansion to "passively" realign solar panels (whether they are used for photo voltaic production or direct heat production)?
BACKGROUND
The efficiency of Solar panels ...
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How can I calculate the thermal stress applied to a window by an ND gel?
I work for a company that installs film studios. Our client have insisted that they retain the floor-to-ceiling windows in the studio space, to use as an alternative background to film against. For ...
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How to derive the formula for Expansion Factor Y in compressible flow?
I tried to understand of some formulas in ISA Standard "Flow Equations for Sizing Control Valves":
http://integrated.cc/cse/ISA_750101_SPBd.pdf
ISA standard likes to give formulas without ...
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Does pressure/temperature drop in a funnel or nozzle with a gas being pumped through it by a fan
So, I was thinking about trying to build some kind of body cooling suit and started looking into the wonderful world of refrigeration systems. I've managed to get myself side-tracked pretty badly ...
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Derivation of deformation equation given thermal expansion
I'm working on a thermal expansion problem out of Beer & Johnston's Mechanics of Materials and I'm a bit confused by the underlying rationale of one of the steps in the solution process.
In the ...
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Stress in a L-shaped Beam due to Thermal Expansion
A L-shaped frame $ABC$ (right angle at $B$) consisting of beams $AB$ and $BC$ are fixed at ends $A$ and $C$ to rigid walls. Find the tensile stress at $A$ when the temperature of the frame is raised ...
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Stress on a statically indeterminate beam with nonuniform temperature distribution
The bar below has length $a$, an uniform cross-section and has both ends fixed to walls. The temperature at the left end is raised by $\Delta T_1$ and that of the right by $\Delta T_2$, where $\Delta ...
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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 ...
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How to calculate the thermal expansion of hollow cylinder
Outer diameter = 256 mm
Inner diameter = 230 mm
The material is Aluminum
Temperature ranges from 23 °C to 200 °C.
Solid cylinder formula is, d1=d0(dt*α+1).
Where, α = 15.2 ×10-6 /K (approx)
How to ...
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Bar fixed at one end at heated
Consider a bar which is fixed at one of the ends. I increase the temperature of the bar by $\Delta T$. The sources I'm referring to say that stress developed in the bar will be zero because the bar is ...
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Why stresses develop during non-uniform heating and not during uniform?
Consider a block of dimensions $l, b, h$ kept on a frictionless surface, initially at some uniform temperature $ T_i $. Assume the material to be homogeneous and isotropic.
When the block is heated ...
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In what way does plating a bimetallic strip affect its displacement?
I've got a mechanism that uses a bimetallic strip; for aesthetic reasons I'd like to electroplate it with a thin layer of gold - how does this affect the relative displacement of a bimetallic strip in ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 (...
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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 ...
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How much an unevenly heated glass plate bows?
In relation to this question about 3D printing, I wonder how much a 200 mm square glass plate heated only in a central 15 cm square region would bow upwards or downwards.
According to the thermal ...
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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 ...
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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 ...
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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 ...
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Can a reinforced hose develop an internal restriction due to thermal expansion?
The type of hose involved is the thinnest one on the right in this picture. This hose contains an external rubber layer, a textile reinforcement layer, an inner rubber layer and a nylon lining.
The ...
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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, ...
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Spatially dependent material property in Abaqus/CAE
I am modelling a plate as 3D deformable solid. My plate has a spatially dependent isotropic thermal expansion coefficient.
I have defined this spatial distribution as a Discrete Field in a tabular ...
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Temperature vs Material Properties - ABS
I'm working on a design that uses fairly large plastic components (ABS, ~400mm longest dimensions). I'm looking at adding a steel component that encapsulates this plastic part. And, the steel part ...
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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 ...
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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 ...
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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
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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 ...
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