All Questions
Tagged with materials applied-mechanics
23
questions
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How to attach plates (my design) to the stator core of the machine more efficiently and precisely?
I am working on an electrical engineering project. However, I have come across a specific mechanical engineering problem. I have attached an image to describe what I want to do. I have primarily a ...
- 1
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How can I reduce noise from pushrods in an assembly without using grease/oil?
I have an assembly which consists of a row of vertically-oriented nylon pushrods (each 5/16" in diameter, colored green in the attached pictures), and two black pieces of laser cut delrin ...
0
votes
1
answer
71
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What would be an ideal material to use for O-rings on a canister in a lubricant-less, high-velocity pneumatic tube system?
I am interested in building an experimental lubricant-less pneumatic tube system in which the canister will be propelled up to a high-velocity, reaching a peak velocity of approximately 100 m/s before ...
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3
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51
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Does the surface finish of the strings on a musical instrument impact the timbre?
Suppose we are testing out different unwound strings on a piano.
Each of the tested strings is made of the same material, has the same length, same diameter, density, etc., the only difference being ...
- 21
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37
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mechanism design for matrix of adjustable direction pointer
I need to construct a matrix of light pointers, each one aims in specific direction, and each pointer direction will be adjusted thousands times, size is flexible could be millimeters or centimeter ...
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170
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where did the concrete splitting test calculated stress formulat come from?
In compression test of cylindrical concrete sample we get the normal stress easily by dividing failure force by sample cross section, but how we can explain the formulat used to determine tensile ...
2
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3
answers
276
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Do all structures deform if put a load on them?
Suppose I have a concrete wall in front of me and I push on it, now it seems that I do work and the energy has magically disappeared.
I am trying to figure out how this works, the explanation I ...
user28616
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0
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51
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How is a plank able to stop a spring door [closed]
So , here we have door which can get closed on its own due to spring. Agenda of Q is to put sth beside the door so that the door does not close .
The Q tells us that when we put a brick of 0.5kg. Door ...
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7
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2
answers
2k
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How do suction cups work?
These are suction-mounting hooks. I want to visualize and understand how do they stick on walls.
After these hooks stick on wall. Like we compressed them. How? Since gases are compressible up to a ...
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4
votes
1
answer
12k
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Why is the Stress vs strain diagram preferable to the Load vs displacement diagram?
I’m really unsure what is the difference between stress vs. strain and load vs displacement graphs and why stress-strain is better.
I know that the units are different:
stress is in MPa and the load ...
- 41
2
votes
1
answer
3k
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How to mechanically attach a compression spring to a flat surface
I am working on a new project right now and I was wondering if anyone had any ideas on how to keep a spring fixed and connected to this flat plastic piece [image shown below].
Our goal is to keep the ...
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votes
1
answer
28
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How could an absorbent material be emptied?
I have been thinking about this for quite some time: Given a foam or other absorbent material saturated with a solvent, how could you draw all the solvent to the top of the foam (basically how could ...
- 1
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2
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1k
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Does a change in specimen dimension affect the measured yield strength and tensile strength?
I am having a hard time trying to understand the effect of geometry on a specimen's yield and tensile strength or if there even is one.
If there is an effect or not, why is it so?
Thanks in advanced!
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2
votes
1
answer
46
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Would an orthotropic cylinder subjected to torsion have warping?
The situation I'm imagining is the one shown above, which is the cross section of a cylinder made of alternating layers of material. The material axes are shown where 1 and 2 are in the same plane and ...
- 137
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2
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497
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2nd Moment of Area of a ring
This is my first question here. I am having trouble finding the 2nd moment of area of a ring with a thickness 't' and radius 'r'. I seem to be a factor of 2 out.
What I do is I consider an area like ...
- 9