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E-PHID Lectures
Германия
Добавлен 22 апр 2021
The aim of this channel is to explain clearly and effectively the concepts of mechanical engineering.
www.e-phid.de
www.e-phid.de
What is material Toughness?
Key words: toughness, ductility, brittleness, energy per unit of volume
The concept of the material toughness in a short video about 2 min. The physical and mathematical definitions of toughness, the difference of ductile and brittle material from the toughness point of view, and the unit of the toughness clearly have been explained.
The concept of the material toughness in a short video about 2 min. The physical and mathematical definitions of toughness, the difference of ductile and brittle material from the toughness point of view, and the unit of the toughness clearly have been explained.
Просмотров: 1 905
Видео
What is Fatigue?
Просмотров 3,6 тыс.Год назад
In this lecture, the concept of mechanical fatigue has been briefly but at the same time comprehensively explained. Timestamps: 00:00 Introduction and concept of fatigue 02:07 Question 1 03:10 Question 2 Key words: Fatigue, fatigue life prediction, stress life method, LEFM, fracture mechanics #facturemechanics #crackpropgation #fracturetoughness#fatigue
Relation among young modulus, shear modulus, bulk modulus, and Poisson’s ratio
Просмотров 3,3 тыс.Год назад
Relation among young modulus, shear modulus, bulk modulus, and Poisson’s ratio
Modulus of Resilience vs Modulus of Toughness
Просмотров 3,6 тыс.Год назад
This short lecture demonstrates the differences between the Modulus of Resilience and the Modulus of Toughness.
Grashof Number
Просмотров 1,4 тыс.Год назад
Key words: Convection, heat trasfer, Reynolds, Prantdl, Nusselt, Natural convection, Forced convection Timestamps: 00:00 Introduction and Definition 02:10 Role of Grashof 03:53 Application of Grashof
Strain-Life Method
Просмотров 5 тыс.Год назад
Stress life method: ruclips.net/video/BHoZ7ZG5szg/видео.html Linear Elastic Fracture Mechanics Methods (LEFM Method): ruclips.net/video/KVAnKGbBJaQ/видео.html Timestamps: 00:00 Introduction 00:53 Body 7:30 Summary
Three Stages of Fatigue
Просмотров 2,8 тыс.2 года назад
Key words: Material fatigue, 3 stages of fatigue, crack initiation, crack growth, fracture micro crack, crack propagation, cyclic load, Timestamps: 00:00 Animation 00:53 Intro 02:17 1st stage: Crack initiation 03:30 2nd stage: Crack growth 04:38 3rd stage: Failure
Strain Energy Density
Просмотров 2,6 тыс.2 года назад
in this lecture, I have given a clear description for strain energy density and its differences with modulus of resilience and modulus of toughness. You can subscribe for coming mechanical lectures
Strain Energy
Просмотров 3,9 тыс.2 года назад
Key words: Stiffness, Force deformation curve, force displacement curve, spring
What is Fick's Law, and its Analogy with Heat Transfer?
Просмотров 1,8 тыс.2 года назад
Timestamps: 00:00 Motivation 00:26 Introduction and first Fick's law 06:24 Second Fick's law 09:34 Analogy of Fick's Law with Heat Transfer 16:29 Summary 17:45 References
What is Prandtl number?
Просмотров 4,3 тыс.2 года назад
Ludwig Prandtl was a physicist who introduced a dimensionless fluid property in convective heat transfer, which is the so-called Prandtl number. It is defined as the ratio of the momentum diffusivity to thermal diffusivity, Timestamps: 00:00 Motivation 00:24 Introduction and definition 02:59 Physical definitions 06:53 Summary 08:19 References Key words: Heat transfer, fluid mechanics, convectio...
What is Nusselt?
Просмотров 6 тыс.2 года назад
In convective heat transfer there are several important dimensionless numbers like Reynolds, Prandtl, Grashof, Rayleigh, and one of them is Nusselt. Wilhelm Nusselt was a mechanical engineer who introduced a dimensionless concept correlating the convective heat transfer coefficient and thermal conductivity, which is the so called Nusselt number. The Nusselt number was a very significant achieve...
CTOD Vs CMOD (Crack Tip Opening Displacement Vs Crack Mouth Opening Displacement)
Просмотров 8 тыс.2 года назад
Do you know what CTOD (Crack Tip Opening Displacement) and CMOD Crack Mouth Opening Displacement are? Stay in this short lecture and get the idea! Timestamps: 00:00 Motivation 00:18 Introduction and definition 01:23 Derivation a relationship between CTOD and CMOD 04:35 Why the CMOD is defined? Key words: CTOD, CMOD, CTOD Test, displacement gauge, fatigue, crack propagation,
Paris Law (Paris-Erdogan Law)
Просмотров 6 тыс.2 года назад
Two persons namely Paris and Erdogan have discovered the power-law relationship for fatigue crack growth in region II of the crack growth rate with respect to the stress intensity factor range. Timestamps: 00:00 Motivation 00:27 Introduction 00:58 Crack growth rate with respect to stress intensity factor range (Curve) 03:54 Paris-Erdogan law (Equation) 05:18 Summary Key words: 3 regions of crac...
How to Apply for a Job in Germany as a Mechanical Engineer
Просмотров 8 тыс.2 года назад
How to Apply for a Job in Germany as a Mechanical Engineer
Stress Concentration Factor Vs Stress Intensity Factor
Просмотров 15 тыс.2 года назад
Stress Concentration Factor Vs Stress Intensity Factor
Terminology of Mechanical Engineering, Part 2: (Mechanics of Materials)
Просмотров 6 тыс.2 года назад
Terminology of Mechanical Engineering, Part 2: (Mechanics of Materials)
Terminology of Mechanical Engineering, Part 1: (Mechanics of Materials)
Просмотров 3,9 тыс.2 года назад
Terminology of Mechanical Engineering, Part 1: (Mechanics of Materials)
What is the Young Modulus of Fiber Composite? (Part 2: Transverse)
Просмотров 8223 года назад
What is the Young Modulus of Fiber Composite? (Part 2: Transverse)
What is the Young Modulus of Fiber Composite? (Part 1: Longitudinal)
Просмотров 2,5 тыс.3 года назад
What is the Young Modulus of Fiber Composite? (Part 1: Longitudinal)
Modulus of Resilience vs Modulus of Toughness
Просмотров 4,5 тыс.3 года назад
Modulus of Resilience vs Modulus of Toughness
Thankyouu , understood a lot better from ur videos
2 years later and still waiting for the physical explanation for CTOD
i like it man
Excellent and straight to the point. Just what I was looking for!
ABİ KESİN TÜRKSÜN :D
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
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.
What is your name?
5:20 why convert to mm?
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.
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.
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
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.
@@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.
What will be the right book for beginners
Phenomenal explanation
thanks for your nice feedback
Love from mysore India
thanks and love
I saw this "F" for the first time. Is this normal?
아아... 감사합니다...
If density increases then what happen stress and strain ??????
strain energy density is actually a function of stress and strain and not vice versa
the logo in the center of the video is very distracting.
Nice informative Lecture..👌
my pleasure
Abi nerelisin sen o nasıl İngilizce
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.'
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.
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
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.
Good work! Thanks!
great, can you please explain the Rayleigh number?
I'll do :)
Thanks, very clear and brief
Thank u! Is the same analysis for a compact Specimen or the consideration change?
thx for the question, it is the same!
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.
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.
Great help
If there is no convection, q̇_conv is not zero. It is in fact just equal to q̇_cond, because as you can imagine, if the fluid is not moving, it just like a solid body and therefore like a solid body. Hence, if there is no flow, then q̇_”conv” = q̇_cond.
*keep in mind that q̇_conduc is just a theoretical/comparative value, but the real heat flow is q̇_convec - so its not just the convective parts of our flow, but the entire reallife flow, which might be convective.
very well explained, thank you
my pleasure
Very useful Thank you so much
my pleasure
Really great video. This concept was worrying me for some time. Thanks for such a simple explanation.
my pleasure
Please record one video about the physical concept of CTOD!! Your videos are great!! Cheers from Brazil :)
ok, I'll do, thanks for your nice feedback
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
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.
Gh
very nice explanation of S-N curve. thanks
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"Solid"🔽 😪
Even the things you don’t like about yourself make you interesting
just cool!
Smokin Looking Superb (as always)
as a mechanical engineer, you explained the things very well. good job
thanks man, you're making lectures for solid mechanics or fluid mechanics?
I'm doing for both
My friend Thanks for sharing this
You should be proud of yourself
Have a very good Day
tiny#1
You are so amazing it was such an honour to meet you
Beautiful Work
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simple and beautiful !!
Love you