All Questions
16
questions
0
votes
0
answers
38
views
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
0
votes
0
answers
40
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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
views
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 ...
- 303
0
votes
3
answers
51
views
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
0
votes
0
answers
37
views
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 ...
- 1
1
vote
0
answers
51
views
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 ...
- 679
4
votes
1
answer
12k
views
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
views
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 ...
0
votes
1
answer
28
views
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
0
votes
2
answers
1k
views
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!
- 11
-1
votes
1
answer
66
views
Approach to solve a frictional problem?
I am having a bar and surface (made of aluminum). I need to attach some material to the end of the bar so that, if I apply any force (25 N-sideways) to bar it has to stick with the surface.
Force ...
- 101
1
vote
1
answer
509
views
LS DYNA Material Model 163, Modified Crushable Foam
Question is on the meaning of input variable TID within material model 163 of LS-Dyna 971.
Definition of TID variable.
TID: Table ID defining yield stress versus volumetric strain at different ...
- 33
5
votes
2
answers
168
views
Longitudinal impact of steel rod on a steel plate to verify the contact duration
So I'm doing an experiment to verify the contact duration when a steel rod (Material: Mild Steel) is allowed to free fall longitudinally on a steel plate. The arrangement is real simple:
The rod is ...
- 51
2
votes
1
answer
74
views
Glass panel engineering at work
We are designing a button panel at work, made out of glass and are running into some issues. Glass, of course, can shatter. But we noticed that when dropping a steel ball in the center of the glass it ...
4
votes
2
answers
9k
views
Increasing Yield Strength with Plastic Deformation
I'm trying to tackle a mechanics problem to be solved using a finite-element analysis, but I'm stuck on one particular bit of theory first.
I've done analysis using a linear-eleastic model, and ...
- 141