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Engineering Materials-Tribology-Design
India
เข้าร่วมเมื่อ 11 มี.ค. 2016
Hi, welcome to this channel. This TH-cam channel is dedicated to the education of students in engineering and science. The topics covered will relate to various aspects of engineering materials, mechanical design principles and some specific topics on tribology. Tribology is more of my research interest. Tribology is defined as the science and technology of interacting solids. It is the study of friction, wear, lubrication and related topics. These are the kind of issues we have to deal with in bearings, joints, tyre, metal processing, etc. I will constantly add new videos. If you have any comment or question related to any of the videos, please write them in the comment section and I will get back to you as soon as possible. In order to popularize this channel, I also request you to like the videos you have watched and also subscribe to this channel. Thanks you very much in advance. Sujeet Kumar Sinha, Department of Mechanical Engineering, Indian Institute of Technology Delhi, India.
Talk given by me at PolyTrib 2024 Portoroz, Slovenia on 03 Oct 2024
Talk given by me at PolyTrib 2024 Portoroz, Slovenia on 03 Oct 2024
มุมมอง: 52
วีดีโอ
Tribology Research in India - Current Status (Plenary talk given on 15 Sept. 2024)
มุมมอง 44หลายเดือนก่อน
This is the video of the talk I gave at the AsiaTrib 2024 conference in Tianjin, China on 15th Sept 2024. I could not include many other points in the talk due to time constraints. Kindly add your opinions about this topic in the comment section. Let us increase tribology R&D presence in India.
Complex Hip Joint Motion - Three ways of sliding between pelvis acetabulum and femoral head
มุมมอง 1148 หลายเดือนก่อน
In this video, I explain the typical motion of the hip joint. The complex motion of hip joint has been modelled as three main types of hip motion. By hip motion we mean the movement of the femoral head and the bone with respect to the pelvis cavity or the acetabulum. Understanding the hip motion is important for bio-tribological studies as the experiments must simulate the hip motion in some wa...
An Intro to my Tribology Research Group works
มุมมอง 1129 หลายเดือนก่อน
This is a quick introductory presentation that I gave to the Mechanical Engineering Society students at IIT Delhi (31 January 2024). You are welcome to visit my website for more research related stuffs at : web.iitd.ac.in/~sks/
Presentation at TriboIndia 2023 conference held in Srinagar, India (5-7 Oct 2023)
มุมมอง 114ปีที่แล้ว
This talk was given by me on 6 October 2023 at TriboIndia 2023 in Srinagar. The conference was organized by the National Institute of Technology (NIT) Srinagar on the campus of the University of Kashmir, India. This talk was based on the journal paper published by us: www.sciencedirect.com/science/article/pii/S0043164823000133 Jaswant Kumar Hirwani, Sujeet K. Sinha, Bio-tribological studies of ...
Bio-tribology of Epoxy - UHMWPE - Hyaluronic acid composites - Presentation at the ITC 2023 Fukuoka
มุมมอง 150ปีที่แล้ว
This talk was given by me at the International Tribology Conference (ITC) 2023, Fukuoka, Japan on the 27 Sept 2023. This conference was organized at the Fukuoka International Congress Centre, Fukuoka, Japan from 25-30 September 2023.
Mechanical Valves
มุมมอง 139ปีที่แล้ว
Many types of mechanical valves for water and gas supply lines are shown here. You can also learn about safety valve used for boilers.
Bio-tribology of Non-UHMWPE Polymers and Composites (A talk given by me to Surface Ventures, UK)
มุมมอง 439ปีที่แล้ว
If you are doing research in the field of bio-tribology or would like to do then you should watch this video. The video is a bit long but I have tried to include all the important points and importantly the relevant references. Your related questions and comments are welcome, as always. UHMWPE is a well-established material for the acetabular cup of hip implants, however, what are other materia...
Tribological Systems Design - Lecture 24-Tribological Design Issues for Seals (Mechanical)
มุมมอง 7372 ปีที่แล้ว
This video presents tribological design Issues for seals (Mechanical). Different types of seals are described.
Tribological Systems Design - Lecture 23-Tribology of Gears (Part II)
มุมมอง 2982 ปีที่แล้ว
This video discusses Gear Tribology and what are design solutions to avoid tribological failure of gears. Last part of the video includes short discussion on tribology of seals.
Tribological Systems Design - Lecture 22-Tribology of Gears (Part I)
มุมมอง 5222 ปีที่แล้ว
Tribology of mechanical gears
Tribological Systems Design - Lecture 21 - Lubricant Additives and Synthetic Lubricants
มุมมอง 6412 ปีที่แล้ว
This is continuation from the previous lecture on lubricants and their properties. I talk about several other additives and then synthetic lubricants. Synthetic lubricants are suitable for high temperature applications such as automotive and aircraft engines, roll mills, continuous casting etc.
Tribological Systems Design - Lecture 20 - Lubricants and their Properties
มุมมอง 9002 ปีที่แล้ว
This video provide detailed description of the lubricants, classifications, property requirements and the lubricant additives.
Tribological Systems Design - Lecture 19 - Zisman Method of Measuring Surface Energy of Solids
มุมมอง 7582 ปีที่แล้ว
This video lecture presents the Zisman method of measuring surface energy of a solid surface. It involves measuring contact angles by homologous liquids (at least three) on the solid surface. Video also presents discussion on the surface energy measurements of magnetic hard disks which contains an ultra thin layer of DLC and PFPE (Z-dol). [I acknowledge figures or tables, if any, taken from the...
Tribological Systems Design - Lecture 18 - Measuring Surface Free Energy of a Solid
มุมมอง 4752 ปีที่แล้ว
This video gives detailed theoretical analysis for the measurement of surface free energy of a solid surface by the Three Liquid Method. For the explanation of friction phenomenon it is important also to measure the water contact angle and surface energies of the two surfaces involved both before wear test and after wear test (i.e. on the wear track). Please LIKE the video, thank you! [I acknow...
Tribological Systems Design - Lecture 17 - Adhesion, van der Waals Forces, Hamaker Constant
มุมมอง 6832 ปีที่แล้ว
Tribological Systems Design - Lecture 17 - Adhesion, van der Waals Forces, Hamaker Constant
Tribological Systems Design - Lecture 16 - Johnson-Kendall-Roberts (JKR) Model - Part II
มุมมอง 6572 ปีที่แล้ว
Tribological Systems Design - Lecture 16 - Johnson-Kendall-Roberts (JKR) Model - Part II
Tribological Systems Design - Lecture 15 - Johnson-Kendall-Roberts (JKR) Model - Part I
มุมมอง 9112 ปีที่แล้ว
Tribological Systems Design - Lecture 15 - Johnson-Kendall-Roberts (JKR) Model - Part I
Tribological Systems Design - Lecture 14 - Hertzian Contact Area Equation; Plastic Contact Equation
มุมมอง 2.6K2 ปีที่แล้ว
Tribological Systems Design - Lecture 14 - Hertzian Contact Area Equation; Plastic Contact Equation
Tribological Systems Design - Lecture 13 - Surface Texture Parameters, Roughness, Hertz Equation
มุมมอง 9802 ปีที่แล้ว
Tribological Systems Design - Lecture 13 - Surface Texture Parameters, Roughness, Hertz Equation
Tribological Systems Design - Lecture 13 - Nature of Surfaces, Roughness, Texture Parameters
มุมมอง 9152 ปีที่แล้ว
Tribological Systems Design - Lecture 13 - Nature of Surfaces, Roughness, Texture Parameters
Tribological Systems Design - Lecture 12 - PV Diagram, Nature of Surfaces, Roughness and Textures
มุมมอง 4012 ปีที่แล้ว
Tribological Systems Design - Lecture 12 - PV Diagram, Nature of Surfaces, Roughness and Textures
Tribological Systems Design - Lecture 11 - Lubrication Types, Stribeck Diagram, Bearing Selection
มุมมอง 4532 ปีที่แล้ว
Tribological Systems Design - Lecture 11 - Lubrication Types, Stribeck Diagram, Bearing Selection
Tribological Systems Design - Lecture 10 - Tribological Solutions, Lubrication, Stribeck Diagram
มุมมอง 4822 ปีที่แล้ว
Tribological Systems Design - Lecture 10 - Tribological Solutions, Lubrication, Stribeck Diagram
Tribological Systems Design - Lecture 9 - Friction Reduction and Important Tribological Solutions
มุมมอง 4322 ปีที่แล้ว
Tribological Systems Design - Lecture 9 - Friction Reduction and Important Tribological Solutions
Tribological Systems Design - Lecture 8 - Wear Mechanisms; Lubrication; Friction Reduction Solutions
มุมมอง 7272 ปีที่แล้ว
Tribological Systems Design - Lecture 8 - Wear Mechanisms; Lubrication; Friction Reduction Solutions
Tribological Systems Design - Lecture 7 - Wear Mechanisms; Abrasive, Adhesive, Delamination; Fatigue
มุมมอง 1.8K2 ปีที่แล้ว
Tribological Systems Design - Lecture 7 - Wear Mechanisms; Abrasive, Adhesive, Delamination; Fatigue
Tribological Systems Design - Lecture 6 - Archard's Law; Wear Mechanism Map; Abrasive, Adhesive Wear
มุมมอง 1.4K2 ปีที่แล้ว
Tribological Systems Design - Lecture 6 - Archard's Law; Wear Mechanism Map; Abrasive, Adhesive Wear
Tribological Systems Design - Lecture 5 - What is wear; Archard's Law; Specific Wear Rate
มุมมอง 5K2 ปีที่แล้ว
Tribological Systems Design - Lecture 5 - What is wear; Archard's Law; Specific Wear Rate
Tribological Systems Design - Lecture 4 - Dry and Rolling Friction; Lubrication; Wear; Archard's Law
มุมมอง 7952 ปีที่แล้ว
Tribological Systems Design - Lecture 4 - Dry and Rolling Friction; Lubrication; Wear; Archard's Law
What’s the minimum rpm needed for that shaft for the air bearing to work?
Can anyone compare this composite with carbon fibre in terms of strength and weight
Many thanks bro
This is super effective. I have really learnt something new today. Thanks so much sir for this tutorial!
Sir, Very informative. Thanks for the detailed explanation. Could you please guide me on how to plot the iso-wear curves on the normalised axes as explained in the lecture. I couldn't follow how wear rate will be constant across the curve, as at different positions the wear will be different right? Thanks in advance.
You fool tell about compressive strength Its uselesd to make coloumn
What is the equation or formula for friction coefficient and dynamic viscosity
Thanks for sharing your knowledge with us. Do you have a video that provides deeper understanding of rheology 101 ( particularly adhesives)
Please watches which might be helpful: th-cam.com/video/Fa_VzLBgSfg/w-d-xo.html th-cam.com/video/zh4ITnv8chw/w-d-xo.html
So the fibreglass didn't break at all, just the epoxy broke? Which explains why you got about 200 MPA rather than 3400MPA which is the tensile stress of the fibre.
Fibres did break. But the volume % of fibre is much less, about 30%, so the fracture stress will be much below the ideal value for all fibre.
There were a lot of concepts related to rheology I was struggling to piece together. Thank you for making this so clear.
Sir truly your way of explaining things are very easy to understand, thank you sir.
Respected Sir, Which book can we read the correct explanation of all the lubrication regimes with real world examples that also give detailed explanation about the curve? Kindly tell
Among good books is one by Khonsari and Booser (Applied Tribology). Also read book by B Bhushan (Principles and Applications of Tribology).
Thank for the great video! Can someone explain equation 4.49 (32:40)? I made average strength calculations and couldn't get this exact expression.
Plus sir I want to learn what is the best base oil for engine oil
Use synthetic that is silicone oil. It is slightly more expensive than mineral based.
How equal will the elastic moduli be obtained using the direct tension or compression method and ultrasonic bulk wave through transmission measurements?
For tension coupon tests of GFRP, do we have to conduct test on lamina(single ply) or laminates (number of plies) ??
It can be on a number of plies. You should test the final composite that you have made.
Very clear explanation and give a vivid example to show the complex concept to understand
Very informative understandable ....need more videos like this from u sir
A nice clear explanation of composite modulus and strength. Thank you.
How to derive the equation for loss modulus / storage modulus in terms of relaxation time and shear constant only
why TH-cam thought that this lecturer is speaking Hindi, while he spoke English. lol
May be because I uploaded the video in India.
Respected Sir, if possible please make a video explaining how different load acts on different types of bearings through Free Body Diagrams. Although it is written in different books that bearings take up radial, axial or combined radial and axial loads but understanding by mere reading the book becomes difficult specially how to visualise the loads acting on the bearings and why a particular type of bearing is suitable for a particular load category 🙏🙏
Really nice vedio for all students who interested in design field thank u sir.. await for next vedio..
Great video, thanks for the information
Hello sir, i am using an additive to my mineral 15w40 engine oil and this additive contains the long chain chlorinated olefin. I am using this additive since the end of the 90's without any problems. Is it true that the Chlorinated Olefin WILL corrode the engine regardless of the additive mix? The additive is resitant from -50 to 315 degrees celcius. Thank you. Rob
Rob, General belief is that the presence of chlorine will corrode metals and it is true. However, I do not have data for your type of application. It is interesting for me to know more about the additive molecule you are using. Could you share? Thank you.
@@engineeringmaterials-tribo5142 sure, can i contact you via email?
@@engineeringmaterials-tribo5142 may i please email you with information as i don't want to share publicly. Thank you
what is the Influence of an elevated temperature on tensile strength of glass fiber- reinforced polymer composites
Good question. For any polymeric material, increasing temperature means reduction in tensile strength. This will happen very drastically. Even within a day or during seasonal changes from winter to summer, you can observe this change. For glass fibre reinforced composite, the same will happen but some what delayed effect. That means GFRP will be able to retain its strength at a higher temperature than the pure plastic. You will need to generate data if you want to know quantitative answer. Please do check in books or research papers.
Thanks for sharing knowledge
Thanks a lot
Very well explained, 👍 Can you please share the details of the book that you are following for these! Thank You.
Plastics Engineering by R J Crawford Mechanical Properties of Solid Polymers by I M Ward and J Sweeney. drive.google.com/file/d/11LTR8GDOGwYCE7fWBEV-vck6uKlRbmBd/view?usp=sharing
@@engineeringmaterials-tribo5142 Thank You 🙂
Great video and great explanation
Please make a video for generalized maxwell model and implementation in ANSYS Workbench
Thanks for the suggestion. This channel is for the general theory and concept understanding without too much of specialization.
Very well explained. Thank you.
Thank you very much Sir. But i would like to know about that how the viscosity of yogurt is tested.
If the yoghurt is easily flowable then the rheometer described in this video can be used. For yoghurt that does not flow like a fluid then perhaps you should conduct compression test, just like we do for cheese.
@@engineeringmaterials-tribo5142 . Thank you very much Sir. Now my mind is almost cleared.
I think it would have been more durable if you had also applied the vacuum process. The vacuum process both eliminates air bubbles and allows the epoxy to penetrate into the bamboo.(Of course, I have no idea how much bamboo absorbs epoxy, for lamination with epoxy, especially resin-free tree species are selected and treated with epoxy.)
You are right, vacuum could be tried. Our specimen was quite large which prevented us from using vacuum. I also do not know if vacuum can help absorb more epoxy inside the bamboo fibres.
Thank you so much for the knowledge, I'll be writing in a few days and I didn't understand what i was readying but this unlocked alot of blockage.
Hi Prof., can you provide some insight on how friction reduces when speed increases from mixed to EHL? Also, share thoughts on the film formation mechanism in the EHL region. Can EHL be applicable to flat-on-flat contacts?
Thanks for asking. As relative speed increases, greater amount of fluid is pulled between the two surfaces because of the stick wall boundary condition between the fluid and the surfaces. More liquid coming in causes a hydrodynamic pressure at the interface and hence greater load bearing capacity is created. This causes the surfaces to move apart with thicker fluid film. Hence, the coefficient of friction decreases because there is no solid to solid contact anymore. In EHL, the above action happens but one more thing happens which is that the contacting surfaces deform elastically providing even thicker liquid film formation. For example, this is also the cause of hydroplaning when you drive at high speed through a pool of water when it is raining. The tyres deform and provide more water coming in between the tyre and the road surface. This effect is large when the tyres of the vehicle are little worn-out or smooth.
Thanks so much. Hardness has been defined as resistance to plastic deformation. That's somehow similar to stiffness which is resistance to elastic deformation. My question is: is hardness analogous to stiffness, is it a rough equivalence of stiffness in the plastic region? I'm asking this in the hope that there's a way for me to make sense of hardness using the stress strain curve even though tensile test doesn't measure hardness. I keep wondering about that given that stiffness and hardness have the same unit and similar definitions. Would love to get your thoughts. Thanks
You make some equivalence between hardness (MPa) and the yield strength of the material which is the stress at which plastic deformation begins in tensile test. There is direct proportionality with the constant being somewhere between 2.8 to 3. Stiffness is the elastic modulus and hence not connected to hardness in the traditional sense.
sir mera selectioin mechanical ke baad ho nahi raha kyuki cocept koi samaj hi nahi aa rhe kya karu sir 8 saal ho gaye
mehanat karna hoga. practice kijiye.
Sir, why don’t you use some better marker pens which can leave legible impression on the white board?
Sorry, on that day I could not find a better one. Rightly pointed out.😊
@@engineeringmaterials-tribo5142 Sir, I'm in my final semester of UG Mech. Engg. Have discovered your teaching on tribology, of late; and found your lectures to be lucid and fluent which helped me to understand some of the Machine Elements lab experiments pertaining to the subject. Thanks!
Very informative 🎉🎉 thanks
Hello, Thank you for the detailed video. Could you also explain how storage modulus is related to Young's modulus, if any? I have seen people using these alternatively. But these are two different properties. Isnt it?
Briefly storage modulus is actually the elastic modulus part and hence we can say Young's modulus. The word storage is used because it means the elastic energy is stored and can be recovered upon release of stress. The loss modulus is the part of energy that is lost due to viscous flow within the material. It is called loss modulus because that part of energy is lost in heat and other dissipative work.
thanks for such a nice video. 👍
Don’t use sealant 😊
kindly elaborate your question/comment. Thanks. 👍
Thank you
Thank you sir.
Thank you for your video. I have a question about this model. Is the JKR formula only applicable to the contact between spheres?
It can also be applied to the contact between sphere and flat by just taking the radius of the flat as infinity.
Thank you for your response. But if I want to consider the JKR adhesive force between two spherical cylinders, would this formula still be applicable? Or what modifications should I make?@@engineeringmaterials-tribo5142
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Thank you so much for this video, really helpful. I was wondering what formula for the friction coefficient can we use. in case i want to compare an experimental results curve with another theoretical curve?
Friction coefficient is always calculated as the ratio of tangential force to the normal force. Please let me know if your question is different.
What's fracture stress?
The final stress a specimen can withstand before fracture initiates. In a tensile stress-strain curve it should be the highest point on the stress axis.
I'm a polymer engineering student and i want to say thank you for this video. It was great and I learned a lot from you❤️ thank you very much sir