Definition of Factor of Safety with Explanation - Introduction to Design of Machine - DOM

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[@matthiasgulczynski1701]

First example (Ductile material) Stress/Strain curve: Point C = Yield Point, the idea is to keep it in elastic region, so the material won't behave in plastic manner. So actually in the example we are lucky enough to design the part with FoS in the way, where we end up at 100 N/mm2 which is elastic region. However as you write STRESS MAX it is should be = Ultimate Stress/Load on the graph. Otherwise it's a bit confusing. By the way I really like your videos - very clear and straight to the point ;).

[@tgeofrey]

plasticity permanently deformation

[@mehdi3743]

I believe that in ductile materials, sigma max is sigma UTS (Ultimate Tensile Stress) not sigma y (yield stress)!

[@anshuljain3458]

Yes

[@ogarparmar3830]

Yes that's true

[@civilideas1925]

Great👍🏻

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[@forsonalbert9859]

Excellent explanation. What a Wonderful teaching.

[@beoptimistic5853]

kzbin.info/www/bejne/rHenfpR-hpmejZo 💐..

[@parmindersingh6776]

sir, which is yield stress of ductile material at point B not at point E ?

[@Mechanical114]

SAME ,I THINK SOMETHING IS WRONG HERE UTSAND YTS

[@iamironman9340]

point at which the strain(elongation) increase without increase in stress(load).The stress corresponding to this point is called yield strength The yield stress measured at a specified % of deformation is called proof stress

[@ogarparmar3830]

For ductile material the yield stress is not the max stress

[@Mr90snerd-xw4do]

Plz upload more such videos

[@wasims295]

Very very good I like that explanations you are very good

[@medication1372]

Sir u r nice thnku soo much

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[@RailFan92]

I am confused in ductile material working stress should be below yield stress which is point C not point E which is in graph, Working stress of ductile material should be in Elastic region below yield stress above yield it will premently deform and component will not function properly.

[@ashokkumarsingh8892]

Nice video

[@SALESENGLISH2020]

4:40 Are you sure Point E is called the Yield stress and not ultimate stress? Please double check and ask some industry experts.

[@akshayranalkar1396]

very informative . thank you..

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[@faizanreza4840]

Thanks a lot ......❤❤❤❤👍👍👍👍

[@peaceworldthroughinside1487]

what is hoop stress pls post the video? your explaining simply super thank u..

[@KiranKumar-pe2rm]

good explanation sir please answer me this question what are factors take into account while choosing factor of safety for design of engine ? & factor of safety of engine?

[@sanket5856]

Kiran Kumar there are many parts in the engine brother so according to the parts we choose fos, as for the engine cylinder creep and fatigue failure both present there, for fatigue failure we can use soddeberg criteria and if we talk about crankshaft, connecting rod ,crank and chains ,they suffers fatigue stress.

[@RITHU314]

Nice sir

[@SandeepRawat-sl4pn]

thanx sir for making in such a simple way... thanks a lot

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[@ramisami6327]

Hello Colleague; point E here in your Drawing represents the Ultimate stress, point B is the Yield stress . thanks

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[@jigneshraval3110]

Thanks sir 👍

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[@rajatchauhan6373]

Plz explain how economy would be affected by increasing FOS. Point no. 3 of " Factors affecting FOS"

[@Ekeeda]

We will work on this and get back to you.

[@anirudhapandey6780]

rajat chauhan as by considering fos working stress decreases due to which we have to increase the dimensions .for e.g. as we know that stress is inversely proportional to area hence for the same load you have to increase the area.

[@gauravgarg9208]

nice,but sir give lectures on gears

[@anirudhapandey6780]

thank u sir for great video

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[@ravithakur0041]

Pls explain why UTS comes in the formula of FOS in case of brittle materials although they dont have UTS values at all ?

[@beoptimistic5853]

kzbin.info/www/bejne/rHenfpR-hpmejZo 💐..

[@babarusman4476]

Thank u sir

[@ngoviews8428]

sir pls explain topic neutral surface and neutral axis

[@-NSanthosh]

Ductile materials fail if it exceeds yeild stress ... After yeild stress the material deform plastically results in loosening of shafts or any component.... That's why we consider yeild stress as max stress for ductile materials...

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[@-NSanthosh]

Is my question right?.. give direct answer for above asked question..

[@divyanshupandey8262]

yes sir pllz give some lature of gear newmerical problem

[@awajiokichejames5641]

what is the factor of safety of forged carbon steel? thank you

[@nsasikumar7745]

How can I decide the fos value ?

[@mirshowket7659]

sir kya fos day kay hota hay materials or we hav to calculate

[@SaifUllah-pm2us]

F O S= Ratio of Ultimate stress to Working Stress

[@ramprasad1211]

What is the factor of safety to be used for residential buildings?

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[@sidhunaik4040]

I ñeed stress and strain problem video sir

[@rajneeshrai1781]

is the value of FOS is fixed for every material or we have to find out..then how to find the Value of FOS

[@sohamzemse]

No, FOS is not fixed for any material. You have to choose a FOS value for your component design depending on your wish. if what u r designing is for normal use then you can take FOS around 3 or 4. if designing an airplane, then FOS should be taken as high as you can, to minimize airplane crashes, for example, FOS = 25.

[@dipakchaudhari523]

E notes channel is explaining in hindi ...That's why per day subscriber in increasing more...As compared to ur channel... U r providing very good notes sir..Nd explaining also best....But aur achha hoga agar hindi me explain kroge to....

[@tirunaharisai8685]

hey! why the hell you gear towards hindi! people from southern part must also understand. English is universal lang! bro. delivery of lecture depends on induvidual.. get u r ass back to u r own circumstances! :)

[@Ekeeda]

Are you from Uttar Pradesh or Bihar? Because we found most of UP and Bihari's urging for Hindi. We are making content for Global user and English is a language which is used Globally. I would suggest you to learn Engineering in English.

[@akshaywagh5469]

aswsm video

[@ImranKhan-nu6fs]

Hello bro , from where you take fos 3 or fos 4, I didn't understand, can you please reply

[@niftywalla]

There is general guidelines about selection of Fs. For ductile material 1.5 to 2 and for brittle material 3 to 5. If for particular application, you want to provide more safety u can increase Fs, which will result in to increase in dimensions

[@bismayajena8299]

What is working stress

[@saiganeshpinnam6317]

what is the exact meaning of ''FOS is greater than one'' according to PRACTICALL..REPLY PLEASE

[@aymenal-suraifi3597]

It means that when the FOS is equal to 1 it doesn’t have any Safety factor (that means the material at the critical point to failure)

[@saiganeshpinnam6317]

ok thank you sir,thanks for reply

[@kaguv7498]

Please be clear with tensile stress / ultimate stress and yield strength already we r under great confusion

[@carbon273]

murali mohan yeah I think he has it backwards😂

[@Sahil-je1js]

❤❤

[@RaviRoY-pv5xo]

Sir IF FOS=4 then sigma working stress 400 how sir can any one reply

[@KaleemKhan-yv9lz]

sir i dont understand it can you explain us little bit clear.

[@ravithakur0041]

I think there is mistake here. Point E is UTS not YS. Point B is YS.

[@nitishgupta6190]

yield stress or ultimate stress

[@nazmusshakib8706]

How can i find out the working stress, anyone please??

[@niftywalla]

Working stress is also known as Permissible stress or Allowable stress kzbin.info/www/bejne/d53beaqfnax7p5Y

[@pothugantibalakrishnayadha4951]

Why we take fos=3

[@dipakchaudhari523]

Sirr aap hindi me explain karoge to channel jyada chalega I m sure.....

[@Saikiran-qb2yo]

Y greater than one

[@Saikiran-qb2yo]

It can be less than one.

[@beoptimistic5853]

kzbin.info/www/bejne/rHenfpR-hpmejZo 💐..

[@jitendrajana3362]

👍👌😊😊

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[@rashmijena3981]

Sir u r avoiding some valuable comments who r having pls do clr it .

[@gauravsingh489]

Bhai aap jaruri comments ka reply hi nhi diye ho...faltu ka reply dera he ho kewal... Pls comment regarding UTS and YS(point) And also clear it about working stress.. 😊

[@niftywalla]

Working stress is also known as Permissible stress or Allowable stress kzbin.info/www/bejne/d53beaqfnax7p5Y

[@niftywalla]

What is your doubt about Ultimate point and Yield point ... Hopefully I can help u

[@Oscar-jg9gg]

why not just assign a working stress

[@Oscar-jg9gg]

I see. FOS depends on 1) material, 2) loading type (static, dynamic, or shock), 3) cost or economy - FOS prop. dimensions 4) importance [of machine part (in complete machine)], 5) Safety to human life, and 6) life of component (life prop. FOS).

[@beoptimistic5853]

kzbin.info/www/bejne/rHenfpR-hpmejZo 💐..

[@gauravgaurav4659]

Like

[@saquibrazakhan7412]

Himanshu Pathak lol

[@beoptimistic5853]

kzbin.info/www/bejne/rHenfpR-hpmejZo 💐..

[@mustafashaikh55]

Thank you sir for this video

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[@vijays-rd8uc]

thanks sir

[@vireshpatil3469]

Thank you boss