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Questions tagged [applied-mechanics]

Questions about using applied mechanics to model engineering problems.

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ABAQUS - error message: too many attempts made for this increment

When solving a nonlinear static problem in ABAQUS, I am constantly encountering the error "Too many attempts made for this increment". What does this error mean and how can it be resolved? ...
lia mor's user avatar
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Which position on a vehicle is least effected by the steering?

I am looking to position a paint sprayer for longitudinal lines on the roads. The plant I have is three wheeled the single wheel is at the front and dual at the back. It has the options to have the ...
Geoff's user avatar
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I want to know on how to maintain center of gravity of a robot (IGV)

I am making a IGV (Inteligent ground vehicle) in the form of a cylinder with the base as a circle. I want to know whether my bot can climb a 15° gradient ramp or not. Some specification of robot - ...
Aryan's user avatar
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Circumferential stress in a toroidal shell

Consider the following formula for circumferential stress (σ2) in a toroidal shell (taken from Roark's Formulae for Stress and Strain): It seems that it has been derived by using simple force balance ...
Johnsmith's user avatar
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Index notation for the generalized form of the velocity field dependance on shear and rotation

Good day guys, I was studying fluid dynamics and came across the following equations (shown in the image): When we have both shear and and rotation, they each contribute to the change in velocity ...
STOI's user avatar
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Would placing sand bags on top of a car's strut housing reduce the jarring impact felt when the car hits a pothole?

I live in an urban area where many of the streets have pot holes and some of these streets have some very large and deep potholes. I have been wondering lately if it would be worth the effort to try ...
user57467's user avatar
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2 answers
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Did anyone ever make training wheels for the original Segway personal transporter device?

I am curious to know if Segway, or any other company, has ever made front and rear training wheels for the original version of the Segway personal transporter device. To help illustrate what I mean by ...
user57467's user avatar
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How could I calculate the torque due to lift and drag in the body frame?

I'm trying to figure out the torque due to aerodynamic forces on an aircraft confined to two dimensions (so no sideslip). Defining the windframe with basis vectors $\hat{w_1}, \hat{w_2}$ obtained by ...
Merkel_Bot's user avatar
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RBE duplication in Hyperworks 2022

Let's assume that I have 50 rows of elements in cone from the basement to the top. And so I need to do rbe contact between each row of elements, but I don't want to repeat the operation every time. Is ...
Nock's user avatar
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How to model a two mass-spring-damper system with a bilinear spring with preload

So, first of all hello👋 I'm new to this forum. Concerning my question, the system I want to model is a somewhat slightly more complicated version of a two mass-spring-damper system (than treated in ...
clueless_engineer's user avatar
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How would you handle the rebalancing of a bearing cage?

I am a intern who was tasked with finding the correct amount to mill off (in an angle) of a bearing cage (basically an annulus with gaps in it to hold the balls or rollers) to bring it back into ...
Anon's user avatar
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Ideal axle diameter function derivation

I am interested in the reference of and any papers that discuss the derivation of the "ideal axle". By an ideal axle I mean an axle that has the same strength along all its cross sections. I ...
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Derivation of the fundamental principle in the mechanics of beams

Can someone provide the derivation for the following equation: $$\int_l Q_Z(x) dx = M_y (x) \tag1$$ or equivalently : $$\frac{dM_y}{dx}=Q_Z\tag2.$$ I am interested in the $1D$ isotropic material ...
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Which way should angles be measured given a coordinate frame, according to convention?

I am building a 2D Electric unicycle model and have a somewhat trivial question concerning convention when defining a coordinate system. The EUC is constrained to move upon flat ground, and a figure ...
Matthew Ediz Beadman's user avatar
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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 ...
vlrbrgm's user avatar
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Does the magnitude or range of interaction of a force affect which layer dominates the mechanical response of a multilayered structure?

Suppose I have a two-layered material, with a stiff and thin outer layer (high E) and a soft (low E) and thick inner layer. Intuitively, it feels like the effect of short-ranged forces (e.g., van der ...
SNIreaPER's user avatar
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Is this metal-ball launching device realistic?

For a school project (college level in "engineering" studies), a classmate and I are trying to design a device that would propel a metal ball of about 0.8 kg to distances up to 12-14m. Its ...
TIPE_ds's user avatar
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Sign convention in link

If we take the moment about A from the $F_{BC}$ will make the body want to rotate counter clock wise but If we take it from the point C it will make the body rotate clock wise whats the mistake?
Youssef Mohamed's user avatar
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1 answer
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Need to Align Line Directions Normals Along Specific Coord in APDL

In Preprocessor of APDL, I have built areas which are meshed with shell element and lines meshed with beam elements. I have assigned Sections to Beam elements but when I view them their cross sections ...
Rehan Khan's user avatar
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1 answer
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How does the mechanics of left-handed scissors differ from right-handed/standard scissors?

So I've read that my right hand with a left-handed scissor "pushes the blades apart" (same with my left hand with right-handed/standard scissors), but I couldn't find out why this happens or ...
damacc's user avatar
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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 ...
Hassan's user avatar
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2 answers
282 views

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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1 answer
40 views

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 ...
yl0l's user avatar
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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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1 answer
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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 ...
tihnik's user avatar
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1 answer
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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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1 answer
34 views

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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1 vote
1 answer
66 views

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
1 vote
0 answers
31 views

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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80 views

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 ...
JFS's user avatar
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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
0 votes
1 answer
31 views

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
1 vote
0 answers
26 views

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
-2 votes
0 answers
39 views

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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1 answer
101 views

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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0 answers
97 views

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 ...
VXR.'s user avatar
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1 answer
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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
0 votes
2 answers
211 views

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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0 answers
40 views

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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0 answers
68 views

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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1 answer
58 views

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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1 answer
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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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0 votes
1 answer
252 views

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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2 votes
1 answer
64 views

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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0 answers
51 views

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 ...
yl0l's user avatar
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0 answers
39 views

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 ...
cav3's user avatar
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0 answers
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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
1 vote
1 answer
47 views

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

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