Questions tagged [stresses]
The stresses tag has no usage guidance.
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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 ...
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Are "Tresca yield surface" a type of failure mechanism?
A non-rigid solid was given a x-direction point load, and von Mises yield criterion is used to check whether the solid would fail or not.
I was also asked: "(the previous question asks us to ...
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Rationale For Plain Strain Assumption in Long or Infinite Bars
When plane strain is discussed, there are two examples given, both of which involve two dimensional boundary stress conditions. One is a constrained object that cannot move along the third axis. From ...
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Stress Strain Analysis In Wall
I have a 20mm thick and 10m long wall. On one side of this wall (inner) is 80 degree celcius water, the outer side is air at an ambient temp of 20 degrees celcius. My coeff of thermal expansion is 15e-...
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Calculating stress tensor from the principle stresses
In the research paper "I. Krakovský et al., A few remarks on the electrostriction of elastomers, 1999" the authors stated the equations of the principle stresses that are produced in an ...
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What's the right stress relief treatment for AS161 magnesium alloy?
I have a 50 year old forged magnesium alloy wheel apparently marked AS161, which I have been led to believe is AS1.61 - not dissimilar to this picture here. So I assume 1.6% aluminium and 1% silicone ...
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Dual Axle Tiny House Trailer Build; Question About Structural Integrity of Trailer Design
I have questions about the fabrication of a tiny house trailer I am building. The questions are focused primarily whether I am adding enough cross supports.
My overarching design principle:
That of a ...
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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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How do I calculate the stress distribution (von Mises stress) on the top cap of a vacuum vessel cylinder subjected to 77 kPa, h=600 mm and dia=200mm
I have designed a vacuum vessel 600 mm deep and 200 mm in diameter with a thickness of 2mm from SS 316 and simulated pressure distribution using FEA. I want to theoretically validate the findings and ...
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Plane strain delamination on bilayer material (conversion from material stress state to residual force and moment)
I have been reading the book The Mechanics and Reliability of Films, Multilayers and Coatings (https://doi.org/10.1017/9781316443606) on chapter 4.2 and got stuck in chapter 4.2 and 4.3.
Suppose that ...
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Calculating Admissible Shear stress with a uniformly distributed load and a point load
I have the following equation for calculating the Admissible shear stress for a uniformly distributed load.
$$\tau_{adm} = \frac{3}{2}\cdot \frac{F\cdot L}{2b\cdot h}$$
where
$F$ = kN/m
$L$ = ...
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Why is stress the same even if I change the material?
I was performing a simple static structural analysis using Ansys to check the stress value for different materials. I have kept the below parameters constant:
Geometry
Force (in N)
Area on which the ...
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Creep of the materials
Does creep exists for all materials at any stress at room temperature? I searched for this and could not find any answer other than creep isn't significant at low stresses and low temperatures. What I ...
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Thin wall pressure vessels: local stresses in bends
How can I calculate the stresses in corners where different geometries meet?
This image is a quick example of the positions i am referring to.
Additional information
In class we studied the membrane ...
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In a thin-walled cylinder, what exactly is Hoop Stress vs Radial Stress?
If I have a thin-walled and not very stiff cylinder, such as a rubber-band, and I put it between two pins and pull it apart radially, is the force required considered the hoop force or radial force? ...
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Residual Stress Induced By Shot Peening
I'm interested in the residual stress profile induced by shot peening. Most of the papers I have read do some measurement and include a graphic which looks like:
This graphic identifies how the ...
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Possible Modification to Contour Method for Residual Stress Measurement
I've been studying the contour method for measuring residual stress. See https://www.lanl.gov/contour/ if you are not familiar.
In the contour method, a single cut is made all the way through the ...
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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.
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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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rows of lights with steel rope (rigging wire) - 12 m between stainless pipe structure and concrete wall
Hello Engineering Stack Exchange.
I have been asked by a friend to hang some lights in a space beneath an arched bridge. The bridge is protected so no holes can be drilled into the arched stone; but ...
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Why are the water tank walls made of stretch film warping a lot whereas theoretically they shouldn't that much?
I am building a water tank of custom dimensions (1.5 m x 0.72 m x 0.86 m) out of stretch film. The stretch film is wrapped around a steel frame (see here for more info on this open source project).
I ...
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Limit for the face width dimension of spur gears
As part of a class project, I need to design a gearbox for power transmission in a small aircraft consisting of spur gears with several constraints. There are relatively few parameters that I can ...
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What does it mean for something to be 'in shear'?
When I was first introduced to 'shear stress' it was using the concept of a beam, this beam was under tension and we determined a value for shear stress for different planes on the beam. As we expect ...
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What does cycle mean in fatigue strength diagram?
A shaft at an usual factory might rotate 2000-3000 (10^3-10^4) per day. So, its rotation cycle easily reaches numbers indicated on X axis below. What does number of cycles in the diagram below exactly ...
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Failure of component due to natural frequency vs stress
lets take a component like a fan blade as an example. Is it right to conclude that it will fail even when the stress is within permissible limits but its operating frequency is close (close enough ...
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Why does the torsion in a circular bar result in shear stress along the axial direction?
In the case of pure torsion, how does a differential area on cross-section of the cylinder with dx length undergo a shear force that is perpendicular to the cross-section ?
I can understand that a ...
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Determining bearing pressure between mating convex and concave conical surfaces?
(In the illustration above, the "Collet" piece in the middle is a bushing)
I'm designing an axial linkage of sorts, and I'm having trouble finding resources, theorems, or guidelines for ...
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Why is it that plane stress varies?
Take the simplest example of some uniform bar being stressed by a force N, I understand that we need to adjust an angle to determine the stress in terms of shear and principal stresses on that plane, ...
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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.
...
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Maximise rigidity of acrylic rod/tube
I understand that for a given quantity of material a tube is stronger than a rod.
I have a 1.4m clear acrylic rod with 16mm diameter however it is too flexible for its intended purpose (imagine ...
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What is the best way to go about finding properties of stress like working stress and yield strength when the material is unknown?
Our group has been working to design a combustion chamber of a relatively small hybrid engine with a chamber pressure of 30 bars. We are currently faced with the problem that we cannot easily access ...
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How can a thicker pipe withstand more pressure? (In general how does geometry affect stress)
I'm misunderstanding something about how geometry affects yield stress. I think this example best illustrates my confusion:
Say you have two pipes with the same internal diameter, same material grade, ...
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What is the effect of lateral friction on the specimen shape
During compression test lateral friction occurs on the lower and upper surfaces of the specimen how does this affect the final shape of it and how do we reduce this effect?
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How do you plot a relation between hardness and strain
How do I plot the relation between hardness of a material and compressive strain knowing the stress-strain curve and indentation size in Brinell's hardness test
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Why does the stress strain curve sometimes not start from zero?
Here this is a Load-Displacement curve from a compression test I did earlier with my colleges, Below is the resulted stress strain curve from the test from the lab computer why did the curve not start ...
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Mechanics of Materials of Flexible Shaft
The flexible shaft is a common transmission device used to either reduce tolerance requirements or develop otherwise impossible machines (e.g. mobile rotary hand tools driven by a stationary mounted ...
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Is it possible to achieve the same amount of stress for an equal amount of deformation but two different cross sections?
I have a small tube with outer diameter (OD) $R_1$ mm and inner diameter (ID) $r_1$ mm. The tube is bent using a moment $M_1$ to create an angle $\theta_1$ with its plane of origin. The stress can ...
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Does Bending Stress Affect Natural Frequency?
I have been researching about the factors that affect natural frequencies, particularly about the effects of stresses.
Most of what I have found only discusses compressive and tensile stresses though, ...
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Dissimilar Metals In A High Heat Environment
Summary:
Have two pieces of metal (7075 Aluminum & 4140 Steel) that appear to have fused together.
Details:
Machined a Flash Hider for a rifle. Purpose was to direct all escaping gas forward, ...
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Why is the open-front bike stem design so widespread despite that it may be inferior to the closed-front design?
Context
Even major bicycle corporations have the occasional
product recall on handlebars.
It's easy to see why. The bike itself is a gentle, light, and nimble ~10 kg (for a road bike) object, whereas ...
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What is the most accurate mathematical model of a cantilever beam's bending?
I read there are multiple models for it,
Plate theory, euler-bernoulli, timoshenko beam theory etc
Which is the most accurate for modelling the bending of a stressed cantilever beam?
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Resultant Forces in a vertical rod
This is a pretty basic question. So in the below figure is the representation of prismatic column. The forces are represented as P1 and P2. let x be an arbitrary cross section between A and B. The ...
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What is the largest diameter a vertical mine shaft may have in bedrock?
What are the design constraints to the diameter of a mine shaft in bedrock, considering the pressure of the ambient rock, its compression strength, the width of the liner, and its compression strength?...
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What should I do if there is no stress concentration for my shape?
Engineering textbooks have graphs like these for finding the stress concentrations for plates with holes, fillets and what not.
What should I do when I get a shape that does not have its stress ...
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Calculate compressive stress in shaft/key surface from torque
When designing shaft keys we calculate compressive stress in hub/shaft/key and compare it with allowable stress. The usual formula is
$$p = \cfrac{F}{A} = \cfrac{\cfrac{M}{R}}{L_e \cdot t}$$
where $p$ ...
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Can stress tensor be defined on feature edges?
Assume a rod is being extruded out of a cylinder by pushing the cylinder into a hole (See Figure below).
Do the feature edges (or corners in 2D) cause the traction (the surface force) to be ...
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Analysis of a Beam under Non-static Case
I am interested in the distribution of the beam in nonstatic cases.
Typically we discuss the stress, and moment distribution when a beam is in a static case.
However, I am interested in this ...
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Could this flywheel assembly have been safely built in 1960-62?
Reference: This question from Worldbuilding.
I'm writing a time travel story set in 1962 and I'm in need of an analogue to Doc Brown's plutonium (or bolt of lightning!). What I settled on for my ...
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How to find the location on the 2-support beam where the deflection will be biggest?
Consider the uniform indeterminate beam as shown above. This beam is to be subjected to a single, 80N point load (acting down ) somewhere along its length.
What is the procedure (i.e steps and logic) ...
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