Deriving euler's equation

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Derivation of euler's equation

Start with the differential equation giving the deflected shape of an elastic member subjected to bending.

$M=-(EI\frac{d y}{d }})=Py$

Set equal to zero.

$EI\frac{d y}{d }}+Py=0$

Divide everything by $EI$ .

$\frac{d y}{d }}+\frac{P}{EI}y=0$

Set the variable, $\alpha ^{2}$

$\alpha ^{2}=\frac{P}{EI}$

then, plug that in to get:

$\frac{d y}{d }}+\alpha ^{2}y=0$

Since this is a second order, linear, ordinary differential equation with constant coefficients, it solves to:

$y=A\sin (\alpha x)=B\cos (\alpha x)$

Take the boundary condition that $x=0$ and $y=0$ to solve for $B$

$y(0)=0=A(0)=B(1)$
$B=0$

Now, take the boundary conditions $x=L$ and $y=0$ .

$y(L)=0=A\sin (\alpha L)$

Since $A$ cannot equal zero:

$\sin (\alpha L)=0$

Take the sine inverse of both sides, and $\alpha L$ can be 0, $\pi$ , $2\pi$ , etc. So...

$\alpha L=n\pi$

Solve for $\alpha ^{2}$

$\alpha ^{2}=\frac{n^{2}\pi ^{2}}{L^{2}}$

Set the two $\alpha ^{2}$ 's equal and solve for $P$ .

${P}_{cr}=\frac{n^{2}\pi ^{2}EI}{L}$

Assume that $n=1$

Now we can solve for ${F}_{cr}$ using this equation.

${F}_{cr}=\frac{{P}_{cr}}{{A}_{g}}=\frac{\pi ^{2}E}{L^{2}}\frac{I}{A}=\frac{\pi ^{2}Er^{2}}{(kL)^{2}}$

where:

$r=\sqrt{\frac{I}{A}}$

Questions & Answers

what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
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research.net
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sciencedirect big data base
Ernesto
how did you get the value of 2000N.What calculations are needed to arrive at it
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