# Questions tagged [stresses]

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### COMSOL multipysics - thermal stress for cubeSat in low earth orbit eigenvalue slover error

I'm using COMSOL version 6.2 for my simulation work. I'm dealing with Heat Transfer involving Radiation and Thermal Stress in solids phisics only after inserting all the constants and boundry ...
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### Shaft undergoes torsion and centrifugal stress

I use this model to get the tangential and radial stress formulas but I want to examine a system also undergoes a torsion under constant speed. I'm a little confused at this point, do I need to point ...
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### Wind Pressure on Chimney

I have this question that I am trying to solve. I cannot put diagram up to show problem because it is over file size limit of 2 MegaBytes, but I will explain problem as best as I can. A brick chimney ...
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### What would be a good way to connect parts that would be replaced on a training model?

I'm trying to work on a training model for neurosurgery. Residents will be operating on the posterior part of the model, and it needs to be replaced after each training session. While the anterior ...
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### Mat Footing (Bending Moment Issue of the Short Strip)

Hi I'm a civil engineering student, I wanted to ask for help and clarification for the design of mat footing. I used the Rigid method and based my design on the ACI 336_2R and Foundation Engineering ...
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### Addressing Variations in Stress Levels for Accurate Fatigue Analysis of Crankshafts

In analyzing the fatigue resistance of a crankshaft, how should we account for the variation in stress levels throughout its 360-degree revolution? Given that the crankshaft is subjected to different ...
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### Find stresses involved and calculate magnitudes

I am new to mechanical design.What all forces and moments act on the hinge plate in following figure?How to find magnitude of stresses induced on the supports? Note: The spring is an expansion spring ...
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### Analyzing shear stress of plate

I would like to conduct a nonlinear analysis to obtain the stress-strain curve of a plate subjected to shear force, as depicted in the figure below. However, I am encountering difficulties in setting ...
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### Combined shear stress due to shear force and torsion

Let's assume I have a rotating shaft supported with bearings at both ends. This shaft is exposed to a point load (by means of another bearing) at some point and a torque. I want to calculate shear ...
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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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### $𝛕_{xz}$ in the flanges of T and I Sections

When we have a T or I section under a shear force $V_y$ I usually must account for a horizontal shear force across the section's Z axis ($𝛕_{xz}$). I understand why a transverse shearing force would ...
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### Find the internal bending moment, Mc

A 7meter,m, long cantilever beam whose weight per meter is 19Newton, N, carries a load that varies uniformly from 43N/m, (Newton/meter), at the inbuilt side, point A, to 0 at the free end, point B. ...
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### Applying simple shear to two plates

I read that the application of shear requires that equal and opposite forces are applied to two parallel plates. Why is this the case? If the force on one plate is transmitted through the material to ...
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### Converting values from Tensile Strength tester to newtons

I have a Tensile Strength tester from TMI model 84-76. I am getting data from this machine over the serial port. I don't understand what the values are that it is streaming during the test. I do know ...
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1 vote
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### Optimizing the layer lines of a 3d printed part, based on subjected forces

I was directed here from the 3d printing stackexchange... For years I have been fortunate to only have had to make 3D prints that don't require a large amount of force on them. But recently (since ...
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### How to calculate the direction of shear stress due to shear force on a circular cross section?

For a circular cross section, we know that the shear stress due to a shear force at the boundary (the radius of the circle) has to be tangent to the curvature. This is so that we have no radial shear ...
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### Impact of generator start-up on its health

In this paper, the authors state that the wear effect of a genset star-up is comparable to the wear cause by 1 to 4 minutes running at full load. This paper dates from 1993, I am looking for a more ...
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### Determine moment and shear stress door

Determine shear stress and moment of bolt: Internal Height of Door = 198.2 cm Internal Width of Door = 89.9 cm Thickness Door = 3.9 cm Weight Door = 45.76 kg or448.9 N Elasticity = 9.8 GPa or N/mm2 ...
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### Identifying Marin Factors In Ansys For Fatigue Analysis

I am conducting a fatigue analysis for a mechanical shaft on ANSYS. Everything is fine except for defining marin factors. I am eager to specify some crucial marin factors, such as the temperature ...
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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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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 ...
1 vote
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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? ...
1 vote
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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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### 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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### 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 ...
1 vote
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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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### 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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### 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 ...
153 views

### 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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