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Engineering Stack Exchange

Questions tagged [applied-mechanics]

Questions about using applied mechanics to model engineering problems.

401 questions
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"u" vs "n" orientation of channel profiles: why difference in strength?

For example, metal tape measures can be extended and stay straight when in a "u" orientation, but collapse the other way round. I presume the same phenomenon is why metal shelving has sheet metal on top, and flanges on the bottom rather than the…
Jodes
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Contradictory units for moments of inertia

I'm looking at a motor datasheet where the moment of inertia is specified in units of "oz in sec^2". I would think that inertia should have dimensions of mass * length^2. I did some further Googling and found that some automatic unit conversion…
Max
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Why the iron bar holding the gondola lift is shaped in this way?

The Gondola lift has an upside down J shape iron bar holding it. I was wondering why it is built in this way and is not straight? Does it have anything to do with balancing?
Ytik
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mechanical counter using ratchet (for a pinball machine)

I have built purely mechanical pinball machines before which used score compartments the balls would fall into to keep track of points. I am now trying to find a way to count points without losing the balls, i. e. a mechanical counter that is…
jmagica
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Block and Tackle with Ramp - stopping rope drag

I am designing a block and tackle system to haul wood up a ramp onto my porch. The issue I am having is that the rope seems like it will rub against the top of the ramp and cause it to fray. How can I prevent this from happening?
JMD
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Pressure-force limiting blocks or relief mechanism for avoiding excessive pressure over a piece

I am looking for some device that can be used for blocking a sheet of glass or other materials in position. On one side of the glass (blue sheet in the diagram) is applied a force if the force is above a certian value the upper block is released and…
G M
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Converting Newton's Second Law Differential Form to Integral Form and Integration Limits

I am reading a report titled ``Definition of safe separation criteria for external store and pilot escape capsules'' in which the author uses following expressions. From Newton's second law: $$ z \left( t\right) = \frac{1}{m} \int…
Ali Baig
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Large Deformation of Soft Hollow Cylinder With Surface Effects

I have to find the elongation of a hollow cylinder subject to internal pressure and constrained on the external surface. Basically the deformations allowed are only the internal radius deformation and the axial elongation, while the external radius…
vlrbrgm
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Determine the reactions on supports A and C and write the functions of the internal forces for the beam sections AB

The figure shows a metallic structure composed of two beams $AB$ and $BC$ connected to each other by a pin in $B$, the structure being supported in A and C through fixed supports. In the AB beam, a constant distributed load $ w= 300 N /m$ and a…
user28922
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Pully size, imagine 2 systems A,B both transmitting power, both 1:1 but if OD of pulley is 50mm on A and 100mm on B, How do we choose optimal size?

All searches resulted in ratio calculations, which makes sense, my question relates to creating a servo driven spindle with 1:1 ratio with timing belt. Is increased belt surface engagement important since its a toothed belt? Also system A and B are…
Rob
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How to build a paper ramp for a small car?

I have been assigned to build a ramp for a small car. I have only one A2 sheet of paper, scissors and a stapler. What would be the best slope profile, in order to move the car as far as possible after leaving the ramp, using only gravity? Any other…
Trenera
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Temperature logging of li-ion cells

I'm looking to measure and log the surface temperature of lithium ion cells (cylindrical and pouch). I tried using LM35 sensors with an Arduino, but, the drift was too much somehow. Any suggestions on how this system can be improved, as in - use…
Calvin Rohan Raj
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Virtual work method for a disk with axisymmetric distributed and concentrated loads

I'm trying to determine all forces/reactions on a disk with a hole in the center. The disk is loaded with a (known) uniform distributed load from A to C (all around the disk), a concentrated (known) load at D (all around the disk), is either simply…
André Almeida
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Difference between maximum shear stress and absolute shear stress

What is the difference between maximum and absolute shear stress in multi axial stress system?
suraj kulkarni
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Design a trolley with four casters

I need design a trolley with four casters, the four casters are installed on the four corners of a 460mmX405mm metal plane. And the load will be a cubic 380mmX225mmX350mm (Height is 350mm), weight about 150Kg, site at the center of the metal…
diverger
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