Questions tagged [stresses]
The stresses tag has no usage guidance.
156
questions
0
votes
1answer
60 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
28 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 ...
1
vote
0answers
30 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
vote
1answer
41 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
votes
0answers
66 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, ...
1
vote
1answer
22 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
vote
1answer
34 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
37 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
votes
1answer
34 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
votes
0answers
57 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
votes
1answer
30 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
2answers
147 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
votes
1answer
47 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
vote
1answer
56 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
votes
2answers
50 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
75 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
votes
1answer
55 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
vote
1answer
43 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
votes
0answers
34 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
189 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
votes
2answers
38 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
votes
0answers
28 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 ...
1
vote
1answer
16 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 ...
0
votes
0answers
19 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
1answer
44 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
votes
1answer
69 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 ...
1
vote
0answers
136 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
votes
1answer
43 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
53 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
votes
4answers
198 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
300 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
votes
1answer
29 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
votes
1answer
78 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 ...
1
vote
1answer
45 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
votes
2answers
45 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
vote
2answers
69 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
29 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
54 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
votes
1answer
53 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 ...
0
votes
1answer
113 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 ...
1
vote
0answers
66 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?
1
vote
0answers
25 views
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
votes
2answers
51 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 ...
1
vote
1answer
49 views
Is it true that if the structure damaged or corroded, the stress will be lower?
I am comparing the stress results between original or non-corroded model to corroded model.
I found that the stress value in non corroded model is lot more bigger than the corroded model,
is it ...
1
vote
1answer
57 views
How to calculate residual strength of a corroded structure from their stress values?
Currently, I have an actual entire corroded bridge model in the FEM analysis in Abaqus
I want to estimate the residual strength of this bridge due to corrosion
from the output results in the Abaqus, I ...
3
votes
2answers
624 views
What exactly is the thin wall assumption in regards to beam cross sections?
What does it mean with respect to calculating stresses on a beam undergoing loading and when should it be applied?
1
vote
1answer
76 views
strength of eggshell
It is a known fact that beams and spheres have the ability to carry relatively high loads.
Beams are seen in bridges and other structures even since the days of ancient roman architecture.
Spheres ...
4
votes
3answers
81 views
Do scaled models reflect strength characteristics of full size
Lets say you want to build a bridge out of carbon fiber. This has never been never been done before, and it's super expensive stuff. So your goal is to use as little material as possible, but ...
0
votes
2answers
86 views
Thick walled cylinder theory - Stress/strain in ballooned out tube
I want to work out how much I can expand a piece of rubber tubing before it ruptures. The wall is 0.75mm and the ID 5mm. Hence I am working out the stress/strain from thick-walled cylinder theory ...
0
votes
2answers
66 views
Why don't car engine piston-rods (or similar parts) fail as often as other car parts?
Anyone who has owned a car has ultimately dealt with failure of a sensor (parking), or A/C failure, battery shutdown or a tyre puncture. Part breakdowns like these are pretty common, at least ...
