Questions tagged [stresses]
The stresses tag has no usage guidance.
163
questions
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How do I determine what hardness to change the bearing or the track?
We have a project that requires us to use a qty of 4, Ø2" yoke roller bearings mounted two per side on a trolley that roll on a steel track. The maximum total weight that we estimate on the track at ...
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0answers
12 views
Understanding compatibility of strains
In mechanics, we have the so called compatibility conditions, which quarantee that when a body deforms, the strains are "compatible" in such a way to no discontinuities or gaps for inside the body as ...
0
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1answer
22 views
Calculating the Thickness of a Glass Tube which contains a Vacuum
I am looking for borosilicate glass tubes which can be used to contain a vacuum, so the top is sealed and then there is a vacuum pump at the bottom where the edges are also sealed, effectively making ...
2
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1answer
64 views
Does the volume change under the tensile or compressive stress?
This confusion arise because my teacher says that volume does not change under tensile/compressive stress within the elastic limit of the material ( consider metal here). But as far as I can see via ...
0
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2answers
61 views
Why does stress act a point instead of on an entire area normal to the stress?
I've often heard stress acts at a point and not on an entire cross-sectional area to which the load is applied normally.
Im a little confused here, Let us consider an area of cross-section ...
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0answers
26 views
What is the difference between $K$ ,$K_{IC}$ and $K_t$?
I have seen three representation of stress concentration factor values $K$,$K_{IC}$ and $K_t$ now all that I know is $_I$ in suffix represents opening mode of crack.The suffix $t$ stands for tip....
0
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1answer
39 views
Calculating Forces using equations of equilibrium
The homogeneous bar shown in Fig. P-106 is supported by a smooth pin at C and a cable that runs from A to B around the smooth peg at D. Find the stress in the cable if its diameter is 0.6 inch and the ...
0
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1answer
95 views
Looking to design a cantilever support to hold up an 80kg projector
I need to make a support (preferably metal) for a projector to be fixed on the wall. The projector size is:
Width: 0.7m
Length: 1.1m
Weight: 80kg
If anyone knows how i can solve this please let me ...
-1
votes
2answers
39 views
What does stress analysis of 3D printed parts reveal vs their normal counterparts?
I have seen videos or heard about 3D printed buildings, 3D printed space shuttle parts and more. There seems to be a lot of craze developing around 3D printed manufacturing.
I have never heard anyone ...
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0answers
151 views
Why is pure shear a “shear”?
If one looks up the meaning of shear strain, most sources talk about this situation:
That is, a force acts along a surface of an element at it is elongated, turning a rectangle into a rhombus. ...
1
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1answer
56 views
How is the stress concentration factor calculated in FEM?
I have written my own finite element code for a linear elastic (plane stress) problem consisting of a plate with a circular hole in the middle, fixed on one side, having a tensile force acting on the ...
2
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0answers
69 views
Shouldn't brittle materials be the ones failing under shear deformations?
It is known that brittle materials tend to fail under normal stresses, that is, tensile or compressive stresses. Brittle materials often are bound together into crystals by ionic bonds between atoms, ...
2
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1answer
31 views
Why is deviatoric stress the one causing distortions?
I'm reading this text on stress.
It is mentioned that the Cauchy stress tensor can be split into a sum of two other tensors: hydrostatic pressure $\pi$ and deviatoric stress. Hydrostatic pressure is ...
1
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1answer
60 views
Locations of max stresses in a circular beam?
If a torque and axial force is applied to a beam with a circular cross section, where along the cross section of the circular beam is the location of the max shear stress, max bending moment, max ...
3
votes
1answer
49 views
What really is so special about principal stresses or stress invariants?
At any point inside a structural element under deformation, we can always find three planes such that when we define a coordinate system with basis vectors lying on those planes, the shear stresses at ...
0
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1answer
38 views
Pressure design thickness and how relates to hoop stress
Stress = Force / Area
Lets see with static force... what happens to stress output when decrease the area.
...
0
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0answers
290 views
Bearing stress v/s crushing stress
What is "Bearing stress" and Is it different from Crushing stress?
If yes explain How?
and
When does an element come under Bearing Stress?
This question came to my mind while studying knuckle joint ...
0
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1answer
88 views
Along which direction is the area moment of inertia taken in bending moment equation?
Is it in the same direction of the applied load or in the co-planar perpendicular direction to the load applied?
3
votes
1answer
169 views
Is stress a vector or scalar?
I have seen some theories saying stress is a scalar. I don't understand why. Anyone can explain.
0
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1answer
70 views
Can I combine two shear-stresses acting on one plane?
For example, I have an axial force and a torsion force applied on a rock socket installed in bedrock. If I am considering the side friction between socket and rock as a resistance, the socket surface ...
1
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1answer
88 views
How to find the diameter of bolts in a flanged joint?
So I'm given this question with the following diagram:
Two sections of a pipe are joined in a flanged joint as shown in the Figure below. The difference in pressure from interior to exterior is 2 MPa....
0
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2answers
56 views
Engineering stress and true stress
I'm confused as to what is the difference between the above said stresses and their corresponding strains. If possible can anybody explain in detail what is engineering stress
2
votes
1answer
107 views
Thermal expansion of a hole in a plate with a temperature gradient
I have a rectangular metal plate with a hole in it (with diameter of 300 mm). The plate has a temperature gradient going from one of its short sides to the other, I can measure the temperature ...
0
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1answer
220 views
Deflection of Rectangular Plate with 2 Simply Supported Edges
As shown in the figure provided, a Uniform load acts upon a rectangular plate with edges at Y = 0 and Y = b which are simply supported.
Using this form of the Plate Equation:
$\frac{\partial^4 \...
1
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1answer
64 views
How to compute core stress in honeycomb structure?
Assume I have a honecomb(sandwich) panel under distributed normal load. Each edge of this panel is simply supported(pinned) as on the picture below:
The problem is how to find the core stresses σ-z (...
0
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0answers
82 views
how did Abaqus integrate the predefined field (stress) into the FEA formulation
The formulation based on the dynamic virtual work equation is
Several boundary conditions can be applied. One of them which Abaqus provided is predefined field (stress). It gives the stress tensor ...
6
votes
4answers
290 views
Why do stress concentrations really occur?
From doing some research I've learned that internal stresses inside an object can "concentrate" on sharp edges, as shown in the above picture. For that reason we often make fillets so that the change ...
0
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2answers
40 views
Does same stress always produce same strain?
I am reading pure bending from Beer Johnston's mechanics of materials.There,a
prismatic member having a plane of symmetry was subjected to equal and opposite couples M and M'acting in that plane.It ...
0
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0answers
30 views
Thin or thick wall for expanding rubber pressure cylinder
If I want to expand a rubber cylinder by a certain internal volume - with all else held constant (type of material, length and radius (without constraining it), etc.) will a thinner or thicker walled ...
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1answer
24 views
Finding Stress Concentration Factor when (D/d) ratio is not on a table?
So we have this homework problem, it is a rectangular filleted bar and we have to find the minimum thickness. I go and calculated the ratios but here's the problem: (D/d) = 1.375. What may the problem ...
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0answers
21 views
How can I increase the strength of this clutch without shearing my bushings?
Here's the setup:
(C) is a clutch. Beyond (C) is the source of torque. The belt (D) transfers the motion from the clutch to the sprocket (B). (B) then transfers the motion to (A) by way of 9 ...
0
votes
2answers
62 views
hoop stress on a thin glass window
A common problem with ultra-high vacuum viewport windows is that often the window material deforms, into a saddle or Pringles chip shape. .
An engineer from a viewport manufacturer explained to me ...
0
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1answer
99 views
Mechanics of Solids / Strength of Materials
I have shared a question from mechanics of solids and my solution with it, as you can see I am trying to take the derivative of the stress equations to find the min, max points but its going wrong. I ...
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0answers
314 views
Derivation of Bimetallic Strip Stress in Roark's Formulas
I am trying to understand some analytic expressions given in the handbook Roark's Formulas for Stress and Strain for bimetallic strip stresses. Namely, Roark's Formulas give the formulas
$$\text{...
0
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1answer
47 views
stress in X- and Y-direction
A steel parallelepiped with a square cross-section fits exactly into the cavity.
it's loaded from the top surface(see picture).
how can I calculate the stress in X- and Y-direction if the strain in X- ...
0
votes
1answer
70 views
Does tunnel lining made of cast iron tubings actually accept all the mechanical loads?
Here goes a recently opened underground railway station in Moscow, Russian Federation (image is from here)
On the left is an undecorated (just painted and it will likely remain this way) tunnel wall. ...
0
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4answers
357 views
Is youngs modulus a derivative of stress and strain?
From This page it can be seen that young's modulus is given by,
E = (Δstress) / (Δstrain)
Which means E is a point function, that changes as the strain in member is increased.
I am feeling ...
3
votes
4answers
992 views
How does stiffness/rigidity affect the bending moment of a beam
My question may sound silly as it’s mainly good sense but I may be mixing things up.
Let’s consider a flexible cantilever beam of a given length and material is fixed at one end and free at the other ...
0
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1answer
30 views
addition of non paralle shearing forces and stresses
I would like to ask for help regarding the summation of non parallel shearing forces acting on an elastic body.
In the image force F (Left to right direction,in yellow) acts on the top horizontal ...
0
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1answer
101 views
stress/shear analysis of components
I am working on analyzing a few problems, but have not really come across this type of stress concentration problem. Does anyone know where I can study the analysis of this situation?
Pressing ball ...
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1answer
57 views
Stress Tensor decomposition into Compression & Tensile forces
I'm working on a project that does a finite element simulation of a mesh. I can output the stress tensor at each node, but I'm not so sure how to implement failure criteria.
If my material is brittle,...
0
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2answers
63 views
How to calculate stress in a cylindrical-uniaxial-loaded bar with sudden changes in its diameter
How can I calculate the von Mises stress in the cross-section of a bar like this that is axially loaded?
1
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2answers
102 views
Is it possible to calculate Young's Modulus of Clay from load-controlled tests?
I'm trying to get the compressive strength (and Young's modulus) of a clay sample.
The method I found is called 'Unconfined Compressive Strength of Cohesive Soil'. According to ASTM D2166M, I have ...
2
votes
1answer
37 views
Normalizing the compressive stress to a cylinder
I'm not an engineer but a neuroscientist.
I do research in spinal cord injury whereby a clip is used to clamp the spinal cord to induce a bilateral compression injury model.
My research looks at the ...
2
votes
1answer
69 views
Resolution of forces and state of stress at a point
Is resolution of forces similar to expressing a vector as a linear combination of some other vectors in linear algebra?
Similarly, Is the state of stress at a point in 3D similar to expressing the ...
0
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1answer
57 views
Stress analysis for the same configuration but different material
The same geometry and the same free body diagram. However, if we replace the material from steel to glass, for example. How does that influence the analysis?
Two things I think are
1. steel is ...
1
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1answer
143 views
LS DYNA Material Model 163, Modified Crushable Foam
Question is on the meaning of input variable TID within material model 163 of LS-Dyna 971.
Definition of TID variable.
TID: Table ID defining yield stress versus volumetric strain at different ...
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0answers
69 views
How to calculate the thickness of the residual stress layer generated by a machining process
Machining a metal part will create residual stresses on its surface due to the deformation that the process introduces to it, is there any model to estimate how thick will this stress layer may be?
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0answers
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How to calculate the required thickness of a material to withstand a certain force or acceleration? [closed]
I am using a sheet of a certain material to dampen a product. Now, I have been looking at different soft dampening materials, and they're all defined by their durometer scale and other factors.
...
0
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2answers
58 views
Loadcell / strain gauge sizing for a joist
I am looking to use some load cells (foil based type) to detect presence for home automation within in a room. I was looking to mount some loadcells to the joists for the floor (UK Based house so ...
