All Questions
Tagged with mechanical-engineering materials
273
questions
8
votes
4
answers
8k
views
Is there a mechanical equivalent to a hi/low pass filter (as in electrical engineering)?
I have been wondering if there are certain media (for instance glass, air, foam, etc.) which are peculiar given their chemical composition and/or structure allowing them to filter out mechanical waves ...
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1
vote
2
answers
65
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Replicating an impact impulse
I am building a test-rig for a device. I have operational data showing the device experiences impact loads resembling a half-sine pulse with width dt and magnitude F. The test rig's purpose is to ...
CommunityBot
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0
votes
1
answer
44
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Valox 420 30% glass wear
I am seeking assistance regarding thermoplastic material wear on a new product I am developing.
The attached image is molded out of Valox 420 30% glass. In the left side image, the locking dents are ...
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0
votes
2
answers
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Force required to deform sheet metal
Hi all. I am building a machine to deform sheet metal into corrugations. I have attached an image that I got off a presentation from MIT's website. In the example, they provide a formula for the ...
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2
votes
1
answer
274
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Constant crosshead speed or constant strain rate for comparing samples of differing thickness?
Say I have two different specimens of a material, one is 10mm thick and the other is 1mm thick. Assume that this material has properties which vary depending on the rate of deformation (I would call ...
CommunityBot
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0
votes
1
answer
158
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How much force is acting on the screws I used?
Years ago I built a vertical rack to store long lengths of wood. The rack was built using 2x4" pine scrap. Imagine a typical wall assembly with a single top and bottom "plate" (2x4) ...
CommunityBot
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0
votes
1
answer
311
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What's the difference between amount of phase and chemical composition of the phase
I don't understand the difference between chemical composition and the amount of phase, why does the chemical composition of the phase not add up to 100%. For example in the image below the chemical ...
CommunityBot
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0
votes
1
answer
64
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Material suited for fixing leakage in liquid nitrogen dewar
I need to fix a leak on the inside of a liquid nitrogen dewar which acts as the coolant tank for a spectroscopy CCD camera. Due to the design of the camera, I unfortunately can only access the inside ...
CommunityBot
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0
votes
0
answers
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I was solving fluctuating load problems and the word "static" confused me
Here's a snippet of the question that was asked a couple of years ago in university exam:
A cantilever beam made of cold rolled steel for which ultimate tensile strength =540 MPa and Yield tensile ...
0
votes
1
answer
627
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3D printer printing out cotton-candy like material after repeated use
I recently purchased a JGMaker Magic 3D printer. It worked well for about 3 months [first picture], but now it is having a lot of trouble.
As you can see in the images below, when printing new pieces, ...
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0
votes
3
answers
325
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Longitudinal and transversal strain
The Poisson ratio of the material equals 0,33. If I load a cube or a cylinder that is fixed at one end with compression force in ANSYS I can confirm that the ratio is 0,33 by dividing the lateral by ...
CommunityBot
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0
votes
1
answer
42
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Aluminium tubing strength - size/thickness v length for supporting its own weight
I want to make a simple fruit picker for a tall fig tree. Most of the fruit is lost as it drops when ripe and explodes on impact with the ground below. That or the birds get to it before we do!
So ...
CommunityBot
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0
votes
1
answer
28
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What is the effect of lateral friction on the specimen shape
During compression test lateral friction occurs on the lower and upper surfaces of the specimen how does this affect the final shape of it and how do we reduce this effect?
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0
votes
1
answer
89
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Mechanical fasteners for HDPE pipe and sheet?
I need to fasten pieces of HDPE together but I’ve heard gluing HDPE is difficult.
I've bought sheets and pipes to make a feeder for a tortoise.
I will be using the sheets for covers for the pipes.
The ...
CommunityBot
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0
votes
1
answer
48
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Why the size of top and bottom rollers is different in three point bend test?
In a short beam shear testing of polymers, the configuration is such that the top (loading) roller is bigger than the bottom (support) rollers. Why is this the case, and what happens when the size of ...
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