# Questions tagged [stress-strain]

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### shear stress and viscocity

1)In a flowing fluid in laminar fashion we know that it flows in planes which slides over each other, Lets take a fluid element (cylindrical) in a pipe(Radius=R) the resistive force is (stress)(cross ...
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### Mechanics for non-standard shapes

The question I have arose when I was working my way through a derivation of the relationship between Young's Modulus, Poisson's ratio and the Shear Modulus (modulus of rigidity), \begin{align} G = \...
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### Stress tensor of a rope in equilibrium [closed]

First of all, let me say that I'm not a student of physics but of mathematics, so please be comprehensive. I'm currently studying continuum mechanics. As an example of applications of Cauchy stress ...
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### Stress tensor of an elastic medium

I don't understand a passage from the book I'm reading about tensor analysis. The state of stress of an elastic medium can be expressed by the stress function $\mathbf{p}(r,n)$ so that the force ...
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### Statics and dynamics in elasticity : how to add time in elasticity

In elasticity, there is are static relations of the form $R(\sigma,\epsilon)=0$. In fluid dynamics, there is a dynamics relation with the conservation of momentum leading to Navier-Stokes equation. ...
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### True strain, engineering strain, strain gauges

I've been somewhat confused over the concepts of true and engineering strain, and I just want to see if I am understanding this correctly. Let us denote true and engineering strain as $\epsilon_t$ ...
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### impossible Poisson's ratio of Lennard-Jones potential type solid (cubic cristal for example), or any potential depending on $r$

We know (for instance : https://en.wikipedia.org/wiki/Poisson%27s_ratio ) that the Poisson ratio is $\nu=1/2-Y/(6B)$, with $Y$ the Young modulus and $B$ the bulk modulus. Let's assume we have a ...
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### Why does the stress strain curve depend upon strain rate?

I was going through this website :https://www.tf.uni-kiel.de/matwis/amat/iss/index.html where it answered a question: Why is the maximum of the (nominal) stress-strain curve and the beginning of ...
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### Can a diamond pipe prevent water from freezing and bursting the pipe?

I know a diamond vacuum blimp is not possible because it will implode under air pressure. Is it possible for a diamond pipe to keep from bursting with frozen water? I found nothing online except ...
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### (I-beam vs rectangular beam) Which sword blade cross section is less likely to break?

Original question Assumption: i made several swords with different cross sections (lenticular, single broad fuller as in viking swords, diamond, hollow ground diamond) the blades are made using the ...
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### Is the Young's modulus the same for compressive and tensile test?

I want to know the Young's modulus for a compressive test, but I have just a tensile test. Are they of the same value?
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### Uniaxial stress question

Let's have a rectangular profiled bar. Let us introduce force $\vec{F}$ which pull the bar apart. In the picture below let us make a virtual horizontal cut $A$. Well, everything is in the picture. ...
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### How to find ultimate stress given true stress - true strain relation?

I am given the following problem: Consider a brass whose true (plastic) stress-true (plastic) strain is given by: $$\sigma_{T,p} = 530Ā \ \rm{MP}\times(\epsilon_{T,p})^{0.36}$$ To simplify the ...
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### Forces in a staically determinate cantilever Truss, why some experiences compression while others experience tension?

The Redundant Truss Apparatus is constructed with units of basic triangular pin-jointed. At joint 1, it is fixed firmly due to a support. At joint 2, it is fixed to a movable support. Suppose at ...
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### Is $\sin\left[2\alpha\right]\cos\left[2\alpha\right]\ge0$ a valid restriction on the angles of the principal stresses in 2D elasticity?

This question pertains to Elasticity: Tensor, Dyadic, and Engineering Approaches By: Pei Chi Chou, Nicholas J. Pagano, Section 1.4. The objective under discussion is to find the directions of ...
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### Why stress always flows through the shorter/stiffer path?

Why load has a preference at which way to act? What is the reason behind this preference? Any link or comment would be welcome
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### young's modulus vs longitudal deformation modulus

Young's modulus is typiccaly denoted with E. I have come accross a similar quantity called longitudal deformation modulus (in Russian literature, they call it Š¼Š¾Š“ŃŠ»Ń ŠæŃŠ¾Š“Š¾Š»ŃŠ½ŃŃ Š“ŠµŃŠ¾ŃŠ¼Š°ŃŠøŠ¹) and it is ...
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### Landau and Lifshitz argument for symmetry of stress tensor

In Landau and Lifshitz's book on the theory of elasticity (vol 7, theoretical physics series), specifically section 2 of the first chapter, the authors present an argument for justifying the symmetry ...
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### How non-tensioned wheel scales? [closed]

As I was reading "Bicycle The history" by Herlihy I noticed something confusing. Book says that typical weight of draisine was forty to fifty pounds. But typical weight of bicycle with wooden wheels ...
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### How much stress do elephants feel due to weight?

While we humans weigh around 70Ā kg, elephants weigh around 5000Ā kg. My question is: While moving or standing, how many more times than humans does the elephant feel the stress due to weight? Is there ...
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### Torque exerted by pressure in a fluid

If I have a solid rigid body (let us call it a duck) in a static regime submitted to the forces of pressure $P$ of a fluid (no shear forces) I can easily calculate the total force $\mathbf{F}$ exerted ...