Questions tagged [stress-strain]
766 questions
22
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11 answers
How can a physical quantity be neither vector nor scalar?
I was going through the definition of stress. I came to know that stress is a tensor quantity. When I checked the net about - 'What is a tensor quantity', I came to know that it is neither a scalar quantity nor a vector quantity. So how can a…
Student
- 347
4
votes
1 answer
Axial Force and Normal Stress in Mechanics
A couple of questions about the behavior of normal stress.
For both of these, assume that the axial force applied is ideal, meaning distributed along the whole face of the member on both sides, and perfectly perpendicular to the face of the member,…
Ethan Dandelion
- 725
3
votes
3 answers
Does the strain induces stress or does the stress induces strain? Or is it both ways?
I have thought intuitively that when a force is applied on a material, the material responds by stress which is the internal force. And then, because of this internal force, the material undergoes some deformation, which is the strain.
So in this…
user134613
- 132
2
votes
2 answers
Why are pressure hulls machined to be nearly spherical?
Why are pressure hulls machined to be nearly spherical? According to Wikipedia, https://en.wikipedia.org/wiki/DSV_Limiting_Factor has a hull that is machined to be nearly spherical "for enhanced buckling stability". Is this really superior to an…
bhuff36
- 121
2
votes
1 answer
Equivalent of the Kirsch Equations for an elliptical rather than circular hole
Is there an equivalent set of closed form equations to the Kirsch Equations but for an elliptical hole rather than a circular hole?
Ian Turner
- 253
2
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0 answers
Why is the collision between two steel spheres of the same size nearly perfectly elastic?
The collisions between spheres in the toy with 5 sphere hanging from a string appear to be nearly perfectly elastic so I assume that of two spheres colliding in mid air also is. If so, why is so little kinetic energy lost in the collision. Why…
Timothy
- 1,648
2
votes
3 answers
Why are the x-components of the stress tensor ($\sigma_{xx}, \sigma_{yx}, \text{and } \sigma_{zx}$) different?
I understand the stress tensor at a specific point $P$ as follows. You draw a cube with its center at $P$ and look at its faces. The face with its normal vector in the positive $x$ direction has a certain force acting on it. $\sigma_{xx}$ is the…
user35734
- 775
2
votes
1 answer
Is stress a property only relevant on surfaces?
I saw that,
$$dF=\sigma \cdot dS$$
Where $dF$ is the differential force, $\sigma$ is the stress tensor, and $dS$ is the differential surface. This equation confuses me a bit. I'm under the impression that stress acts over a volume rather than a…
Zach466920
- 1,117
1
vote
0 answers
Photoelasticity and existence of stress
Shall we consider photoelasticity a non-mathematical, or purely visual, proof of the existence of stresses in mechanical structures undergoing external loading?
pluton
- 267
1
vote
2 answers
Shear stress vs normal stress in incompressible solid
According to my current understanding, if a non compressible solid cube is subjected to a uniaxial compressing force, it will essentially be flattened - it will get shorter along the axis that is being compressed, but longer on the other two axes to…
Person
- 11
1
vote
1 answer
Calculating poissons ratio proof?
I am new to this.
$$\sigma = d(d)/d/(dl/L) f$$
$$\sigma= \frac{d(diameterf)/diameter}{d(length)/length}$$
Now volume being = V
$$V= constant$$
for a rod
$$(\pi d^2/4)*(l)=V$$
$$=> d^2 \ l = constant$$
$$(d^2)(l)=(d+…
1
vote
2 answers
How does stress in solids work?
How do you figure out what the stress equations are? How do you find a solution to the stress equation?
Timothy
- 1,648
1
vote
2 answers
Why don't we consider the reduce cross-sectional area while calculating stress in a metallic wire?
Consider a wire which is being pulled by a force (within elastic limit) then the reaction force will be equal to the applied force then we say that the stress will be equal to applied force/cross-sectional area but at the same time we also know that…
user249643
1
vote
2 answers
For stress-strain curves, how can we differentiate if it is a composite or a metal?
For the following stress-strain curves we have to choose which one corresponds to aluminium and which one to carbon fiber, a composite:
We think the carbon fiber should be the one with the higher modulus of elasticity and the lower strain (the…
Patricia GC
- 53
1
vote
1 answer
Computation of strain in oval frame
I have the textbook "Roark's Formula's for Stress and Strain," but it does not discuss the case of an oval-shaped frame under stress. For example, imagine we have a 100-ton press with the oval-shaped frame made of a material with a 100,000 PSI…
Ambrose Swasey
- 4,474