E-PHID Lectures

2 жыл бұрын

Terminology of Mechanical Engineering, Part 2: (Mechanics of Materials)

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@user-ml8hy8up3zАй бұрын

i like it man

@ats1995Ай бұрын

Excellent and straight to the point. Just what I was looking for!

@elvesunАй бұрын

ABİ KESİN TÜRKSÜN :D

@medjahedmohamedaimene21632 ай бұрын

please i have question of stress lengh in paris low in equation put the initial stress length or we change a stress length with function of number of cyclics

@EphidlecturesАй бұрын

I'm not sure if I've understood your question. However, the external load makes the stress on material and the crack growth rate is a function of the stress intensity factor range.

@Bollywood-universe5 ай бұрын

What is your name?

@lukasw.76145 ай бұрын

5:20 why convert to mm?

@Ephidlectures5 ай бұрын

Because the hardness has been put in MPa or N/mm^2. So the units should be compatible. Also, we would like to get the wear volume in mm^3.

@TruePreView6 ай бұрын

Hello, thank you for the video. I have a question... the length (and area) of the sample may change during the test. When calculating energy density, do you consider the original length (and area), or do you consider the length (and area) during, or after the test? I hope my question makes sense. Thank you again.

@sharjeelahmed60026 ай бұрын

How hardness is taken in MPa? Hardness is normally dimensionless number, it is on a scale like brinell or vicker etc. From where can we take value of K? Thanks

@Ephidlectures6 ай бұрын

Thanks for your question, the hardness is not unitless. The SI unit of hardness is Pa or MPa. Here it has been taken MPa or N/mm2 to have the other length dimensions in mm. By the way, the value of K can be achieved experimentally.

@sharjeelahmed60026 ай бұрын

@@Ephidlectures Thanks for reply. Actually while performing calaculations, we do not have experimental setup. Are there any standard tables from where we can take approximate values of k for general material pairs. Like SS and MS etc.

@marlonrogers7287 ай бұрын

What will be the right book for beginners

@deniz.72009 ай бұрын

Phenomenal explanation

@Ephidlectures9 ай бұрын

thanks for your nice feedback

@MANJUNATHAHJPG22A-vo4gn9 ай бұрын

Love from mysore India

@Ephidlectures9 ай бұрын

thanks and love

@christinegouda Жыл бұрын

I saw this "F" for the first time. Is this normal?

@user-qg3qy7yk5b Жыл бұрын

아아... 감사합니다...

@NAKK786 Жыл бұрын

If density increases then what happen stress and strain ??????

@Ephidlectures Жыл бұрын

strain energy density is actually a function of stress and strain and not vice versa

@syedsaadqainhaider2456 Жыл бұрын

the logo in the center of the video is very distracting.

@niladrichakraborty3795 Жыл бұрын

Nice informative Lecture..👌

@Ephidlectures Жыл бұрын

my pleasure

@cenkinan Жыл бұрын

Abi nerelisin sen o nasıl İngilizce

@SeracS354 Жыл бұрын

Hey, nice video - you say they are different quantities but they can both be measured using the Notched Charpy Test, so are they really independent physical properties? en.wikipedia.org/wiki/Toughness 'The Charpy and Izod notched impact strength tests are typical ASTM tests used to determine toughness.' and en.wikipedia.org/wiki/Fracture_toughness 'A widely utilized standardized test method is the Charpy impact test whereby a sample with a V-notch or a U-notch is subjected to impact from behind the notch.'

@Ephidlectures Жыл бұрын

Thanks for your nice question, by telling they are different, I meant academically the fracture toughness is a term which takes you to field of fracture mechanics, but with toughness you are still in regular solid mechanics. Secondly, in fracture toughness always there is crack topic, but in toughness not.

@bluscuro7534 Жыл бұрын

Very good exploration! So with parndtl number can I compare how two different fluids are good in convection? If this number is bigger can I say the the fluids has a bad heat transfer capacity? Thanks

@Ephidlectures Жыл бұрын

Almost, what you told is true. High Prandtl number means momentum dominates and that's why there is "good convection but poor conduction" and vice versa.

@jozefj362 Жыл бұрын

Good work! Thanks!

@Kevin_2022 Жыл бұрын

great, can you please explain the Rayleigh number?

@Ephidlectures Жыл бұрын

I'll do :)

@MaryDavis-pd2jx Жыл бұрын

Thanks, very clear and brief

@sebastiancallejas4492 Жыл бұрын

Thank u! Is the same analysis for a compact Specimen or the consideration change?

@Ephidlectures Жыл бұрын

thx for the question, it is the same!

@elv7743 Жыл бұрын

well explained but there is one thing that doesn't add up. you're saying that if Nu = 1, there is no convection. this can't be mathematically correct cuz if Nu = Q_conv / Q_cond, then Nusselt is also 0 if convection is zero. could you explain this please.

@Ephidlectures Жыл бұрын

Many thanks for your interesting question, you know the ratio of convection over conduction is only a physical interpretation of Nusselt and not a mathematical and exact meaning of Nusselt. By the way, in micro scale always there is motion between molecules of a fluid.

@supriyode84934 ай бұрын

Great help

@ravisha000 Жыл бұрын

very well explained, thank you

@Ephidlectures Жыл бұрын

my pleasure

@mohamedkalifa9191 Жыл бұрын

Very useful Thank you so much

@Ephidlectures Жыл бұрын

my pleasure

@muhammadshaheryarkhan90352 жыл бұрын

Really great video. This concept was worrying me for some time. Thanks for such a simple explanation.

@Ephidlectures2 жыл бұрын

my pleasure

@annacarolinabarreiro72232 жыл бұрын

Please record one video about the physical concept of CTOD!! Your videos are great!! Cheers from Brazil :)

@Ephidlectures2 жыл бұрын

ok, I'll do, thanks for your nice feedback

@realengineering21782 жыл бұрын

Hi, I am confused of r (dimensionless parameter). if the width is w, the width for v and delta should be alpha and (w-alpha) respectively. How do we relate r here? Thank you

@Ephidlectures2 жыл бұрын

thanks for your question, you know the "r" must be dimensions otherwise the right and left hand sides of the equation won't cancel each other out.