Questions tagged [applied-mechanics]

Questions about using applied mechanics to model engineering problems.

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What is the difference between maximum principal strain and maximum in-plane principal strain?

For the purpose of answering/explaining this, it does not need to be restricted to strains (i.e., it can be stresses too). I am mainly trying to understand when to use which one (i.e., if I am ...
SNIreaPER's user avatar
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Deformation Due to Material Removal and Residual Stress

Suppose I have a piece of metal (of arbitrary geometry) with some residual stress profile. I then remove a chunk of the metal and the piece of metal deforms (due to the residual stress). For ...
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Checking if a Residual Stress Field Achieves Mechanical Equilibrium

Suppose I told you the Cauchy Stress Tensor at every point inside a chunk of metal. And, yes, I know this means that I would need to tell you about an infinite number of points - let's ignore that ...
yl0l's user avatar
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Continuous swinging machine

I'm making art piece that is hanging from roof and I would like to have it in continuous swinging motion. What kind of mechanism could be used in this case? info about the art piece about 16kg shape ...
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How can we calculate the combined stiffness of a spline connected to a straight member?

I have a geometry that looks something like this. What will be the combined stiffness of the members?
Ahsan Cheema's user avatar
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Keeping a cardholder hanging from a lanyard always facing the same side

I always have the problem of having my ID cardholder flipping when I'm walking, and people not being able to see the side with the information. I cannot double-print this ID front and back so I wonder:...
Quebec's user avatar
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What is the meaning of the traction continuity condition in the generalized momentum balance (continuum mechanics)?

In Nonlinear Finite Elements for Continua and Structures by Belytschko and al. it is stated: As we have already noted, the strong form, or generalized momentum balance, consists of the momentum ...
Paolo Secchi's user avatar
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Designing a mechanism for moving a tank in circular motion [closed]

Thanks everyone. For a university proyect of fluid mechanics we have designed a device that rotates a tank separating the movements for both axis in the horizontal and vertical one using leadscrews....
Iñigo Zarate's user avatar
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How to determine whether a threaded rod will rotate under load

A part of a structure I am designing incorporates a large threaded rod (1") diameter mounted vertically both for structural strength and for the potential to adjust the height of the top mounted ...
Nachiket Adhvaryu's user avatar
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Building Equations of Motion

The following figures represent a model of a building, can someone help me, extract the newton equations of motion and determine the degrees of freedom.
Rayleigh's user avatar
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Stress Amplitude Calculation in Haigh Diagram beside Limit Line

I want to use the Haigh diagram for mean stress and stress amplitude correction using SODERBERG limit line. All I can find is the relation between stress amplitude and mean stress described at the ...
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Why are the indices of term of the Cauchy Stress Tensor and Maxwell Stress Tensor opposite to each other?

For CST (https://en.wikipedia.org/wiki/Cauchy_stress_tensor), the first index represents the plane and the second index represents the direction: For MST (https://en.wikipedia.org/wiki/...
SNIreaPER's user avatar
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How to find the displacement at each interface of a composite structure subjected to shear force?

Imagine a block made of 3 horizontal layers of 3 different materials (shear moduli S1, S2, S3) and fixed at the bottom surface. If I apply a displacement 'x1' (or shear stress 'V1') to the top layer, ...
SNIreaPER's user avatar
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Gyroscopic effect with multiple parts rotating

I understand how a basic gyroscope work and how to work out the precession. Now consider the following. The spinning mass of a basic gyroscope is connected via a gear to another rotating mass, which ...
Cyril_engineeringSE's user avatar
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Can air trapped in a water line controlled by solenoid cause a slow drip?

I have a water dispenser on a fridge, that has started dripping after replacing a filter, and turning off slowly. The manufacturer says that this might be due to air trapped in the line. I can't ...
sebf's user avatar
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explain me the dynamics involved in performing wheelie [duplicate]

Wheelie is a motorbike stunt in which the rider balances the bike on one wheel. I am trying to understand the dynamics of performing this wheelie. with a free-body diagram and all the forces acting on ...
mike_1234's user avatar
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Help me understand the mechanics involved in performing a wheelie

I am a mechanical engineering student trying to understand the mechanics of a wheelie (a maneuver). Can someone explain to me the mechanics behind performing a wheelie? With a free-body diagram. And ...
mike_1234's user avatar
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Comparison between hand calculations of a continuous beam with FEA simulation (Solidworks)

I've seen many videos and books where statically determined beams' hand calculations are checked using FEA. But why is it that FEA results don't match the ones obtained using hand calculations (in ...
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How to find out the strain distribution of a block in a simple compression test?

I am performing a displacement-controlled compression test on a square block, where the top of the block is attached to a fixed plate, and the bottom of the block is attached to a movable plate that ...
SNIreaPER's user avatar
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gear size selection for a compound gear system to fulfill a specific output ratio

I need help creating a compound gear system that will result in the sought after drive ratio or very close to it. Naturally gear teeth need to be whole numbers. Websites like 'GearGenerator' (dot-com) ...
Inventor Moe's user avatar
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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 ...
user10264746's user avatar
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Why carrom coins have the circular profiles on them?

Why do carrom coins have these circular profiles on them? At first I thought that this will reduce the friction as area reduces, but quickly recalled that friction for solids don't really depend that ...
Suryakant Thakur's user avatar
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Superposition of cylinder stress and normal stress

I need to calculate the principal stresses for the given cylinder with thick walls inside filled with gas shown on this picture: I used the Lamé equations, namely: $$\sigma_{x} = p\cdot\frac{r_{1}^2}{...
User198's user avatar
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rotate gear while no keeping it engaged with other gears

i am trying to build a toy where i need gear B to rotate when gear A rotates but when gear B rotate through a outforce gear A shouldnot rotate i hope that explains it well. (: Both gears are on the ...
sd 0's user avatar
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How to calculate force acting on axle from hub motor with known torque?

In some electric bikes, a motor is mounted to the hub of the front wheel. When turned on, this hub motor applies a torque, turning the wheel, reacting against the ground, with a resultant force acting ...
Chuck's user avatar
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Who introduced the term "Stress" in mechanics?

I know that Cauchy introduced the idea of stress in 1822 via the Cauchy tetrahedron, did he term it too ? Any reference is appreciated.
Mechanician's user avatar
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Using Strain Tensors to Recover Stress Tensors

Disclaimer: I am very new to the field of mechanics, my background is in electrical engineering. I apologize in advance if anything is horribly wrong. My references are: "First Course in FEM, 4th ...
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how to determine orientation of an element? - engineering mechanics

In mechanics, we always just assume the initial element orientation to be parallel to the surface. In practice how do we define it? Can we always make this assumption? Why or why not? I would assume ...
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Shear stress and force

I have got a cantilever beam subject to forces and moments. I found the shear force diagram and moment diagram. I am having trouble finding the shear stress distribution and normal stress ...
Ali's user avatar
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Modelling friction and its application to generalised forces in the Euler Lagrange equations in a 2D Unicycle model

I am in progress of building a simplistic 2D model of an electric unicycle with the intention of creating a stabilizing controller. The EUC can be modeled as an elaborate inverted pendulum and the ...
Matthew Ediz Beadman's user avatar
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What are the physical implications of modelling a rider on a unicycle as a massless rod and spring attached to a point mass?

Foreword This is not an industrial question; I will not profit from any answers, and I am asking because it is the subject of my final year project at university. Also apologies to the US for using ...
Matthew Ediz Beadman's user avatar
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What is the impact of energy control in an AC in terms of cooling and power consumption?

Nowadays many inverter ACs come with energy saver modes claiming to run at 80% 60% etc… In this case wouldnt the cooling capacity also decrease? For eg if the AC is running at 60%, the AC compressor ...
Vipin Menon's user avatar
1 vote
2 answers
111 views

Doubt related to S-N curve

S-N curve is drawn from the results of fatigue test and fatigue test is conducted under completely reversed bending stress condition on a standard specimen. Is there any reason for conducting the test ...
MechaTrex's user avatar
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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's user avatar
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How to calculate the required power to pump out (to vacuum) a container?

Consider I have a cubic container with its volume is 1m cubic as in the simple picture above. It is sealed nicely, it is air proof, no air leaking. I would like to pump out (to vacuum) the container ...
AirCraft Lover's user avatar
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Fixed Free Fixed Free Rectangular Plate Subjected to a Point Load solved by FDM

The equation for deflection of a rectangular plate by using classical plate theory is given as, Here Pz value on the RHS is uniformly distributed load acting on entire plate in Newton per metres. ...
AJAY SARAF's user avatar
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stress power of a solid

In the balance of mechanical energy https://pkel015.connect.amazon.auckland.ac.nz/SolidMechanicsBooks/Part_III/Chapter_3_Stress_Mass_Momentum/Stress_Balance_Principles_08_Cons_of_Mech_Energy.pdf, $\...
Sthavishtha Bhopalam's user avatar
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Saturation of penetration length using Lucas-Washburn equation

The Washburn equation for capillary flow provides the following expression for the calculation of the penetration depth (or capillary rise): $L \propto \sqrt(t)$ My question is when t goes to infinity,...
Mechanician's user avatar
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1 answer
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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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Input power unit for Heavy Duty spool hose

I'm trying to design a machine for spooling a hose at a mining application. Considering all hose length, mass, spooling diameter and pump the peak torque would be of To = 10267 Nm. It sounds a lot but ...
andrevacode's user avatar
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241 views

Can I use this simple pulley system to lift a large 100lb box?

Problem: I have a 98 lb box with dimensions of 45"l x 41"w x 27"h that holds a holiday decoration. I need to lift it to a shelf I made that is 103" above the floor. The space I ...
FDecker's user avatar
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1 answer
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How to find Tensile Modulus of a layer of Plain Woven GFRP with GSM of Fabric given

I need to Input "E" the tensile modulus for analysis of a composite layer made from Plain Woven E-Glass Epoxy composite material. I know the GSM (g/m^2) of fabric is 106. Using GSM =106, ...
Rehan Jamshed's user avatar
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76 views

What causes an EUC to propel forwards when leaned forwards?

I have heavily edited the question, as its previous standing was quite hopeless Thinking about a simple model of a unicycle, where the rider is a uniformly distributed rod and the unicycle just ...
Matthew Ediz Beadman's user avatar
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1 answer
236 views

Applications of overdamping, critical damping and underdamping

I am a math lecturer and in my teaching of second-order linear differential equations I present, as an application, the classical mass-spring-dashpot system (and its RLC analogue). According to my ...
Dimitris's user avatar
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1 vote
1 answer
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How to change the direction of a chain-sprocket system

I’m looking for a way to change the direction (90 °) of a motion transmitted by a basic chain-sprocket system. Is there such a thing as a chain-driven equivalent to straight bevel gears? I’m planning ...
Ludovik B.'s user avatar
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1 answer
34 views

Sequential installation of pumps from the point of view of mechanics

Let's say we have a case of sequential installation of identical pumps in a pipe with a diameter equal to its entire length, water flows in this pipe. Since when the water passes through the first ...
Grand Miks's user avatar
1 vote
2 answers
61 views

What is wrong with the derivation for x coordinate of Centroid of quarter of a circle below?

In the derivation for x coordinate of centroid of a quarter circle as shown in the image below why is the sign coming out to be negative when actually it should be positive?
inquisitive learner's user avatar
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Finding hoop stress in a half-cylinder

I have a half cylinder which is significantly thick but not very long. In the half cylinder, a force $F_{app}$ is being applied over a certain area as shown in the figure below: I have to find the ...
s6292_1997's user avatar
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What kind of sensor can I use for measuring the rotational position and speed of a link in a fourbar mechanism?

I work in mechanism circuit breaker design. We typically use mechanism that utilize small Θ and we therefore measure using linear travel potentiometers. On this new design, I need to measure a larger ...
Georgije Stanisic's user avatar
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Approaching/formulating a problem in solid mechanics

Consider a thin surface and hold it tightly and vertically at a point on its boundary. What it is the shape it assumes? As a particular example let's take a circular plate clamped on a plane, as shown ...
Daniel Castro's user avatar

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