# Questions tagged [stress-strain]

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### Are you more likely to break a string when bending behind the nut of a guitar vs. when bending on the fretboard?

When I refer to 'bending behind the nut', I am referring to the action of fretting a note and then applying a downward force to one of the strings in the section labelled 'L1' in the image below to ...
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### Creep mechanism (thermal and irradiation induced/enhanced) and embrittlement in fcc and bcc

When comparing FCC (Face-Centered Cubic) and BCC (Body-Centered Cubic) metals, I typically consider their packing efficiency and the number of active slip planes. FCC structures exhibit higher packing ...
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### Stress in elastic material for spherical symmetric solution [duplicate]

Let $A$ be a ball of radius $R_0$ made of an elastic material. We compress the ball by applying an uniform force on the external surface till the radius of the ball is reduced to a radius $R_1<R_0$....
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### Equation for the deflection of a flexible wing due to bending moments with a non-negligible rate of deflection when a point load is applied to its end

Suppose I have a model wing made of some flexible (easily bendable) plastic, I want to find a function which can describe the amount of deflection as a function of the distance from the support of the ...
1 vote
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### Calculation of displacement field from a strain field

I am trying to calculate the displacement field from a given strain field in 3D. It is quite a cumbersome calculation, as presented in Applied mechanics of solids by Bower; u_i(x) ...
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### Does a cube under high pressure transform into a ball?

Will a material in the shape of a cube, under high pressure, crumble into the shape of a ball? One would expect that there will develop strains and stresses, after which the corners crumble and ...
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### Stress/forces on elements in continuum mechanics

When looking at small elements in continuum mechanics, why do we draw that the stress/force the way shown in diagrams? How do we know the "pairs" of forces on opposite faces always opposite, ...
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1 vote
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### Confused about stresses in a small element in solid mechanics

So in the diagram of a stress tensor, the normal and shear stresses on opposite faces of the small cube are equal and opposite. This is justified by equilibrium. On the other hand, in the differential ...
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### Are bodies in fluids stressed?

If air applies pressure isotropically in all directions normal and into the object, then does it mean that anything in air is stressed by the air pressure? I know that the pressure is all the same in ...
1 vote
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### Why does a cantilever beam bend instead of shearing when a point load is applied?

I have just learnt about cantilever beams and that they are free on one end and supported on the other. In my class, my teacher showed an example of when we apply a point load at the end of a ...
85 views

### Reason for stress and strain

Do you think that the stress is due to strain or vice versa? I have this doubt because of two of the following scenarios: Consider the case of the rigidly fixed bar. It is now heated (say be some ...
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1 vote
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### Elasticity theory: homogeneous deformations of a perfect lattice

I want to understand how the macroscopic (linear) elasticity theory emerges from the microscopic properties of matter. My question is about the model of the "perfect lattice", which is used ...
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### Stress tensor from forces

Consider a body that is acted on by a variable external force density $\vec{f}(\vec{r})$. I want to know what the pressure and shear stress would be within the body as a result of these external ...
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### Direction of shear-stress on fluid element

This image is regarding flow of viscous fluid between two parallel plates. I don't understand how they determine direction of shear stress above and below the element. As the flow is towards right ...
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1 vote
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### How can I identify a quarter or half wave plate from a used/modified Strainoptics polarimeter?

I'm a glassblower and I need to test glass formulas for compatibility. I'd like to use a polarimeter as it allows not only the detection of strain, but also informs if a glass needs to be softer or ...
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### Surface tension versus stress in a balloon's membrane

I am conducting an experiment in which I am measuring how the internal pressure in a balloon varies with its circumference. To explain the relationship (shown in the graph below) I decided to ...
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### Identifying the elastic limit? [closed]

Consider this problem I understand that the elastic limit is the point at which the material no longer elastically deforms, that is it doesn't return to its original shape. However, I am struggling ...
28 views

I am trying to get an intuitive understanding of the normal components of the stress tensor for a Newtonian Fluid. The stress on the x face in the x direction is $$\sigma_{xx} = 2*\mu\frac{\partial u}{... 0 votes 1 answer 257 views ### Question about the general Schmid’s law expression to calculate the critically resolved shear stress I have a question about Schmid’s law for an arbitrary stress state. I found conflicting expressions and I would like to know which one is correct. \boldsymbol{s}: slip direction \boldsymbol{n}: ... -1 votes 1 answer 287 views ### Normal Stress Components of Viscous Stress Tensor for Incompressible Fluid I am trying to get an intuitive understanding of the normal components of the stress tensor for a Newtonian Fluid. The stress on the x face in the x direction is$$\sigma_{xx} = 2*\mu\frac{\partial u}{...
1 vote
I am trying to get an intuitive understanding of the normal components of the stress tensor for a Newtonian Fluid. The stress on the x face in the x direction is \sigma_{xx} = 2*\mu\frac{\partial u}{...