Mechanics of Materials: Lesson 9 - Stress Strain Diagram, Guaranteed for Exam 1!

[@LScout800]

You taught what my professor took a month to teach me. You are the most loved man at my school, everywhere in the engineering building students have your videos pulled up on your laptops.

[@maximotseng9508]

where you been last year and this year bruh

[@robhousehold]

2 hours of brutal lecture, all summed up in an engaging way in 22 minutes. Thank you

[@raquelmariagarridorodrigue6088]

Here's an chemical engineer student from the south of spain who learns a lot by you. I understand better mechanics of materials and now im ready to pass Material science subject. Cheers!!

[@Thomas_ThePaw]

You da man Jeff Hanson. Your videos are helping me through an Engineering degree which I used to think I wasn't smart enough to pursue. You're proof positive to the major impact a gifted educator can have on the life trajectory of the disenfranchised. Keep on keeping on Dr Hanson 🤙💪

[@AdithyaRKumar]

Fantastic sir! I would like to add that I work in the Auto sector and we design the sheet metal components to be permanently deformed from their inception state of flat sheet metal so that they have the right functionality (toughness, shape etc)

[@Sasuki774]

This video is liquid gold. Thank you Jeff for everything!

[@mtrik748]

So amazing! I always thought of being a professor as a career, you are one of the few people that I look to and other professors should look up to aswell! Learning should be about understanding the material in ways that aren’t going to feel like chores, and you do that very well. Thanks so much for your content!

[@ts8824]

Best tutoring video I've found online, complicated concepts were all explained in a understandable and fast way, thank you!

[@lanceward7048]

Jeff Hansen is an unsung hero to many mechanical engineering programs across the country / world

[@hajiranigar1863]

M from India and i wish we had these kind of lectures in our classess, no extra drags just crisp of information and what an ossom clarity nothing that i should go back and google about. A best lecture, Love from India❤❤❤

[@EurekaChild]

Fantastic Lecture! Regarding your question at 8:44 whether we design anything to be permanently deformed... Yes! Bike helmets are designed to get permanently deformed when they are actually used 🙂 The helmet deforms and takes the energy and prevents the force from getting transferred to the head. If the helmet did not deform, our heads would!

[@danielzamora4730]

This guy literally explains it in a way that my professors thats so easy. My professors over complicate the subject.

[@usandmexico]

8:45 A dart board and and other similar targets, tears or holes to help open packaging I think aluminum bolts in BMW's N52 engine are designed to permanently deform also because you must replace the bolts when they are removed. And after searching for this, I came across torque to yield fasteners (TTY) or stretch bolts.

[@studocmatt]

I'm a dental student and this video helped me tremendously understand biomaterials, thank you Mr. Hanson!

[@A.Hisham86]

a whole semester on this topic, in 22min! Awesome.

[@amitkandwal4655]

Hi Jeff, really great stuff. Thank you for sharing. A request, please post something on fatigue, fracture mechanics and mechanical vibration too.

[@alexanderluster402]

The break cartridges on one of those safety table saws that stops and retracts the blade when it senses a finger

[@randompassbyer7223]

Nice lecture, my professor actually recommended us here ;)

[@Adam_mohammed_]

Very helpful, I studied that in a course called (building materials) year ago. and I am studying it again in this course now (mechanics of materials)

[@justinseals2816]

His examples are great.

[@humbertouquillasmartinez6301]

Excellent explanation, I had not understand why the materials behavior that weird durve way and now I realise that was never the real behabour, Thanks for the video.

[@chandraaid]

Such a great video! I have seen this question in books - Which is more elastic - steel or rubber? The general explanation is that materials with greater Young's modulus is more elastic. I don't understand this. It will be great if you could explain this better.

[@mikemiller3391]

One example may be, cylinder head bolts in an internal combustion engine. These are typically “torque to yield” fasteners and are to only be used one time.

[@nshrawder24]

Some tapered light poles are mandrel expanded after seam welding which results in a higher strength(strain hardened) permanent deformation worked into the design. Essentially, the pole falls into one ASTM prior to expansion and another ASTM after. Sorry can't remember the numbers but think it's A595 in final form but might be 6 something

[@duraidali]

Very good explanation… you are a talented lecturer

[@aramhadizadeh7753]

you are freaking awesome Jeff. thank you man

[@rakch148]

Car tires are designed to work to some extent under permanent deformation. They are not permanent deformation right out of the factory but they are designed to have some benefit under some permanent deformation(eg. help absorb more impact, maintain overall shape). Without these design you will need to change the tires much more frequently.

[@mrcoffee315]

excellent lecture profesor

[@BharathRamcool]

You are simply awesome Prof!

[@manuboker1]

Wonderful Lectures ! Thanks.

[@Eduart535]

you are the best

[@danielwaiswajohn7042]

very clear explanations. thanks

[@slim590]

great great teacher. thank you

[@dyno241]

permanent deformation designed in: crumple zones/ bumpers in cars. the permanent deformations are studied extensively and designed to happen.

[@JulieanGalak]

Isn't cold-working of metal an intentional permanent deformation?

[@JulieanGalak]

My biggest confusion with the stress strain diagram is just in the choice of axes. Stress is the independent variable, strain is the dependent variable. Why isn't stress on the horizontal axis? Took me ages to figure out this graph the first time I saw it...

[@nonnikcamffej]

I'm guessing it is because the Modulus of Elasticity, E, is defined as the SLOPE of the Stress-Strain diagram in the plastic area of the graph, or Stress/Strain.

[@Kwintony]

It has to do with Young's Modulus, which is just the slope of the stress-strain diagram

[@Jason01460]

How about permament deformation in lumber that can happen naturally due to moisture or else?

[@petearndt3221]

Torque to yield bolts in most modern automotive application

[@ahmedsardar4504]

hi thanks for the lecture i have one question and it my homework too why the stress is go up in vertical direction and strain with horizontal direction

[@justinking9266]

maybe copper piping, its designed to have a low yeild strength so that it can be bent into shape easily?

[@youssefelmaghraby6963]

love you jeff

[@Haf_Nain]

Great work sir

[@alisalim7379]

عاش والله انا مش فاهم حاجة بس باين ان شرحك حلو

[@crismathews4354]

Thank you sir!

[@fadoobabadpl]

16:50, End of mechanics of materials, start of fracture mechanics. kind off

[@Lostwolf16]

Dogbone sample killed me lol

[@squareroot1698]

how is aluminum brittle. i dont get it

[@melisaalfonso471]

I wish he was my professor :(

[@alisonwinderbrake9259]

drywall anchors

[@dylanmcgriff822]

Aluminum cans

[@oliverschutz7822]

crush washers

[@romelmuqattash3375]

Hollo point ammunition

[@romelmuqattash3375]

i cant spell they pay me to do math

[@diannkelloh6251]

Thank you sir your lessons are Soo helpful

[@devasyagandhi3742]

i dont which teachen provides students with coke 😅🤣🤣🤣⚪

[@qualityman1965]

Wow. You have no east Indian accent.

[@ethanberriman9992]

Paperclip is deformed