Sir truly your way of explaining things are very easy to understand, thank you sir.
@aksrivastava4558 күн бұрын
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
@4096fb13 күн бұрын
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.
@mikeanaba51821 күн бұрын
Plus sir I want to learn what is the best base oil for engine oil
@engineeringmaterials-tribo51429 күн бұрын
Use synthetic that is silicone oil. It is slightly more expensive than mineral based.
@toshibamaster221027 күн бұрын
How equal will the elastic moduli be obtained using the direct tension or compression method and ultrasonic bulk wave through transmission measurements?
@sirajudheench8819Ай бұрын
For tension coupon tests of GFRP, do we have to conduct test on lamina(single ply) or laminates (number of plies) ??
@free2learn886Ай бұрын
Very clear explanation and give a vivid example to show the complex concept to understand
@senthila6938Ай бұрын
Very informative understandable ....need more videos like this from u sir
@j.gordonleishman6401Ай бұрын
A nice clear explanation of composite modulus and strength. Thank you.
@fathimafarsana6622 ай бұрын
How to derive the equation for loss modulus / storage modulus in terms of relaxation time and shear constant only
@ThanhTran-pi4qw2 ай бұрын
why KZbin thought that this lecturer is speaking Hindi, while he spoke English. lol
@engineeringmaterials-tribo51422 ай бұрын
May be because I uploaded the video in India.
@aksrivastava4552 ай бұрын
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 🙏🙏
@akashrikame66262 ай бұрын
Really nice vedio for all students who interested in design field thank u sir.. await for next vedio..
@davidmoncisvais33482 ай бұрын
Great video, thanks for the information
@robrobster91483 ай бұрын
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
@engineeringmaterials-tribo51422 ай бұрын
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.
@robrobster91482 ай бұрын
@@engineeringmaterials-tribo5142 sure, can i contact you via email?
@robrobster91482 ай бұрын
@@engineeringmaterials-tribo5142 may i please email you with information as i don't want to share publicly. Thank you
@mvuyekurenunigabriel97363 ай бұрын
what is the Influence of an elevated temperature on tensile strength of glass fiber- reinforced polymer composites
@engineeringmaterials-tribo51422 ай бұрын
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.
@mvuyekurenunigabriel97363 ай бұрын
Thanks for sharing knowledge
@mohamedkalifa91913 ай бұрын
Thanks a lot
@hassanejaz81393 ай бұрын
Very well explained, 👍 Can you please share the details of the book that you are following for these! Thank You.
@engineeringmaterials-tribo51423 ай бұрын
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
@hassanejaz81392 ай бұрын
@@engineeringmaterials-tribo5142 Thank You 🙂
@rujekomaredza67093 ай бұрын
Great video and great explanation
@jayashodiya68403 ай бұрын
Please make a video for generalized maxwell model and implementation in ANSYS Workbench
@engineeringmaterials-tribo51423 ай бұрын
Thanks for the suggestion. This channel is for the general theory and concept understanding without too much of specialization.
@jayashodiya68403 ай бұрын
Very well explained. Thank you.
@AsifAnwar-io1di3 ай бұрын
Thank you very much Sir. But i would like to know about that how the viscosity of yogurt is tested.
@engineeringmaterials-tribo51423 ай бұрын
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.
@qnedim32004 ай бұрын
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.)
@engineeringmaterials-tribo51423 ай бұрын
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.
@user-wc4no1hn1u4 ай бұрын
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.
@user-tj8do1np5b4 ай бұрын
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?
@engineeringmaterials-tribo51424 ай бұрын
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.
@randatatang92224 ай бұрын
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
@engineeringmaterials-tribo51424 ай бұрын
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.
@VISHAL_PAREKH4 ай бұрын
sir mera selectioin mechanical ke baad ho nahi raha kyuki cocept koi samaj hi nahi aa rhe kya karu sir 8 saal ho gaye
@engineeringmaterials-tribo51424 ай бұрын
mehanat karna hoga. practice kijiye.
@3.14294 ай бұрын
Sir, why don’t you use some better marker pens which can leave legible impression on the white board?
@engineeringmaterials-tribo51424 ай бұрын
Sorry, on that day I could not find a better one. Rightly pointed out.😊
@3.14294 ай бұрын
@@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!
@bhimashankariliger25155 ай бұрын
Very informative 🎉🎉 thanks
@biltumahato11385 ай бұрын
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?
@engineeringmaterials-tribo51424 ай бұрын
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.
@user-rt7wm4mm6e5 ай бұрын
thanks for such a nice video. 👍
@abijascv50996 ай бұрын
Don’t use sealant 😊
@engineeringmaterials-tribo51426 ай бұрын
kindly elaborate your question/comment. Thanks. 👍
@tvenkatesh24596 ай бұрын
Thank you
@PhilipMoritzBischof6 ай бұрын
Thank you sir.
@user-ck6eu2ez2h6 ай бұрын
Thank you for your video. I have a question about this model. Is the JKR formula only applicable to the contact between spheres?
@engineeringmaterials-tribo51426 ай бұрын
It can also be applied to the contact between sphere and flat by just taking the radius of the flat as infinity.
@user-ck6eu2ez2h6 ай бұрын
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
@user-hu9sv3hk3t7 ай бұрын
ممكن رقم تواصل
@blueowmar70097 ай бұрын
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?
@engineeringmaterials-tribo51427 ай бұрын
Friction coefficient is always calculated as the ratio of tangential force to the normal force. Please let me know if your question is different.
@omosayegbemisola66777 ай бұрын
What's fracture stress?
@engineeringmaterials-tribo51427 ай бұрын
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.
@ashkanmohammadhasan20307 ай бұрын
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
@ameramer25237 ай бұрын
Hello my project is on basalt fiber reinforced composites do i have to use the same ASTM standards for my test piece
@ameramer25237 ай бұрын
And also what do you mean by volume percentage 70 of fiber can you explain it elaborately please
@engineeringmaterials-tribo51427 ай бұрын
% can be calculated as weight % and also as volume %. For composites, always use volume %. This means 70% of the volume of the whole composite is the fibre.
@engineeringmaterials-tribo51427 ай бұрын
preferably use same ASTM for continuous fibre composite. If short fibre composite then please check if ASTM has another standards for that.
@user-pg6ei9wj8d7 ай бұрын
Very informative. For viscosity values shown in the table, should we exclude the measurement at point 1 as it gives a totally different value from points 2 to 20?
@engineeringmaterials-tribo51427 ай бұрын
time 23:55. Yes you have pointed out an important aspect of the data collection. Often the initial couple data may be totally different and need to be omitted. Also, every test must be repeated at the same set of conditions three times, at least.
@jyotichoudhary14078 ай бұрын
Where i contact you regarding this testing i want to ask my query
@engineeringmaterials-tribo51428 ай бұрын
you may kindly ask here in this comment section.
@user-ei4sq2vf8l8 ай бұрын
Kudos👌 excellent describing. easy to understand
@TombRaideR1338 ай бұрын
thanks
@faisalabdullah17748 ай бұрын
Thank you sir for this great video, it is really helpful and full of valuable information.. I do have one question for your kind input; Can you tell which of the two fiber deformation processes, i.e. whether fiber pull out or the fiber fracture, will consume more energy and results in higher toughness composite? Thank you again
@engineeringmaterials-tribo51428 ай бұрын
Energy required for fibre pull out depends upon the fibre-matrix adhesion strength. The adhesion strength is optimized so that the fibre fracture will happen after some fibre-matrix debonding. This is essential for toughness. Hence, it is a combination of the adhesion strength between the fibre and the matrix, and the fibre tensile strength which will decide the final toughness of the composite. Both are necessary.
@milapmehta71509 ай бұрын
Thanks for the video prof. I am recently starting a Master Thesis on Rheologie examination using very high shear rates, i am wondering the career prospects in the field, Will I be satisfied on this aspect ?
@engineeringmaterials-tribo51428 ай бұрын
It depends which department you are in. Rheological studies are generally carried out for polymers, lubricants etc. If you have conducted your research well then you should definitely try in similar kind of companies. You will need broad domain knowledge of the department you are in.
@ahmedelshahawy88789 ай бұрын
Thanks
@mediwise24749 ай бұрын
Sir pl recomend an easy to understand paper on matrix mechanics
@engineeringmaterials-tribo51428 ай бұрын
This has to be found in textbooks. Papers do not provide the basic understanding stuff.
@allanhill43989 ай бұрын
Your explanation of adhesive anchors is incorrect. Epoxy snchors, specifically those used in this application ' are mixed by nozzles designed for this purpose . Therefore the resin and hardener are not mixed by spinning in the threaded rod.
@engineeringmaterials-tribo51428 ай бұрын
You may be right. I have followed the case-studies and the news/video reports that came out after the failure. Modern nozzle design must be different than what was available at that time. Thanks for the comment.
@allanhill43988 ай бұрын
@@engineeringmaterials-tribo5142 i worked in the anchor industry for 38 years. The only adhesive anchor that was mixed by spinning the rods into the holes was a glass capsule containing polyester resins. This project employed injected epoxy.