Tensile Test

Basic principle and practical procedure of the tensile test on ductile metallic materials
- Testing machine (Inspekt 200 kN, Hegewald & Peschke Meß- und Prüftechnik GmbH), specimen, extensometer
- Material with yield point phenomenon
- Elastic and plastic behaviour, uniform elongation, necking, fracture
- Yield strength, tensile strength, percentage elongation at fracture
- Material without yield point phenomenon
- Plastic behaviour, proof strength
Responsible for this video: Prof. Dr.-Ing. Rainer Schwab, Hochschule Karlsruhe (Karlsruhe University of Applied Sciences), Germany

[@abdelrahmanhazemmohamedkam5781]

It''s very interesting to see how things work practically instead of just reading it from books.

[@randomeditz2484]

Exactly

[@Facund1tt0]

Totally agree.

[@vinoduikey45]

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[@vinoduikey45]

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[@vinoduikey45]

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[@emkox7765]

No idea why this was in my recommendations, but I watched it and it was interesting. Props for Anneke Reinsperger for speaking English without even the hint of a German accent.

[@dimassilva6822]

Very clear speaking.

[@giovannipelissero1886]

I searched it to see with my eyes what I was studying (for an exam about polymers)

[@jessiezhao8742]

I dont work in material science just needed to learn something for work so I landed on your video. Not only the content of the video is informative but I also find how the entire process is explained is very neat! Thank you for sharing!

[@maclinacarvalho8151]

This proved to be very helpful in my engineering practical exams . 🙏🏻

[@lucarutigliano6539]

I'm studying for the metallurgy exam at university and this video helps a lot to visualize and really understand how the complete process works.

[@rickclassico5359]

Grande bro

[@thenozar7603]

Never quite understood why we always had two different graphs but thanks to this video it's very clear. Great stuff

[@ManufacturingET]

Finally some really good videos on materials testing. Thanks!!

[@sebastiancrawford4148]

this is the best video on tensile testing and strain on KZbin

[@arbabraiyan8200]

The best video I ever saw on this, keep it up! thank you for showing the curve as the test proceeds..

[@alirio4768]

This is an insteresting and informative video. I'm a Mechanical Engineering and this information clarifies some concepts.

[@paocornejo4821]

Congratulations for your work, this is very helpful for beginners/students and experts. :)

[@MaterialsScience2000]

Mechanical stress sigma is always defined as Force F divided by cross sectional area S (or area A). Or more precise: NOMINAL stress sigma equals force F divided by ORIGINAL cross sectional area S zero. In the video TWO physical quantities are plotted on the vertical axis: Force F on the right side and stress sigma on the left side. Sorry for this, it may be confusing. You get sigma on the left side by simply taking F and dividing it by the original cross sectional area S zero.

[@danieltscharner4898]

thank you so much for this video, while my professor has excellent knowledge we learn little so these videos are a lifesaver.

[@RightInstrumentCoLtd]

What happy as same the company in your industry, I am a China company, good video!

[@user-rr7vq4xk1b]

This video is really well made, thank you for making it. Finally some really good videos on materials testing. Thanks!!.

[@MaterialsScience2000]

In materials of medium or low ductility, the fracture may take place anywhere along the prismatic part of the specimen, mostly at a weak point. In very ductile materials, the fracture tends to form in the middle region, because there is a certain influence of the grip regions.

[@gianlucacastro5281]

This video is really well made, thank you for making it

[@MaterialsScience2000]

The term "elongation" in ASTM 615 indeed is not specified clearly. To my knowledge it can only mean "percentage elongation after fracture". So one has to put the fragments together and then determine the percentage plastic deformation after fracture has occurred.

[@bluustreak6578]

Very informative without any fuzz!

[@momenterkesan4098]

Thanks for your video, it was helped me to finish my final project

[@jacobkane9984]

Very informative and very proffesional. Thank you

[@abhishekkumarjaiswal7397]

This video is very informative and has good explanation. Thank you

[@dimassilva6822]

Best Tensile Test video in internet.

[@sudhansugrahacharya7094]

nice video.this video is much more suitable for professionals than students. this is widely used in industries. well we had this experiment done during my engg time.

[@khouloudejbari7873]

thank you so much ,your voice is great ; peace from morocco

[@trik3002]

Now thats what u call, THE BEST..!!

[@MaterialsScience2000]

"what would be if we take off tension on the middle of experiment for example on 18mm elongation. and apply it again?" Then an elastic spring-back parallel to the elastic straight line would take place, not to the original length, but to the plastically strained length of about 17.8 mm. On reloading, after elastic behaviour the original curve will be resumed, as if nothing had happened.

[@mr.ranaji2027]

Too much helpfull practical knowledge

[@ShelbyPBowen]

Very neat! We just went over these concepts in Solid Mechanics.

[@MaterialsScience2000]

"If this rod was a hollow tube or pipe how would the inner diameter be effected? Am I to assume that the point at which it would neck the inner diameter would increase roughly as much as the outer diameter decreases?" We do not have much experience on tensile tests of tubes, but as far as I know, the inner diameter at the neck will decrease, and the outer diameter as well, a bit more than the inner one. So from the side, the broken tube looks similar to the massive cylindrical specimen.

[@anandlakhani6935]

This video is very helpful. Thank You.

[@snehmittal2109]

Thankyou for uploading this. It was really helpful 🙏

[@stephaniefields7971]

I’m in 6th grade and this was the first advanced thing I’ve learned like this so thx

[@muhamanaf]

Thank you. It really helps me a lot for preparing my exam

[@oyasumidoge]

Amazing video helped me a lot with my project.

[@RAHULKUMAR-pk1rt]

Gajab nice work 🤗🤗❣️

[@MaterialsScience2000]

"Why does the machine not apply any additional force in the 'luda' (Lüder) area of the curve?": This is an important question, and a research topic of mine, please see our publ. "On the nature of the yield point phenomenon" in Acta Materialia. "And why does the machine apply less and less force right before final fracture?" This is due to "material instability": Here the strain hardening effect is not strong enough to compensate the strength decrease due to the decrease in cross sectional area.

[@Fallenangel-si4bd]

what can you conclude about the yield strength of the two specimen tested here?

[@zach7147]

This is extremely fascinating. I'm super motivated to finish my remaining education. Working two full time jobs for school has been very tiresome.

[@blahbleh5671]

well done *claps*

[@philipranjit4586]

how old were u a year ago

[@pan4909]

@@philipranjit4586 ok

[@philipranjit4586]

@@pan4909 wow i was a massive dick a year ago

[@pan4909]

@@philipranjit4586 lol 1 year ago m8

[@georgesimon1322]

It is really interesting. Good presentation.

[@Zaur525]

More information about yield phenomenon, please. That was very interesting, informative and helpful

[@tusharbhagat27]

Good presentation as well as explanation.

[@digiconvalley]

Thanks alot ! Perfecttt!

[@beremolina264]

It is a good video, it explains the procedure very well.

[@siraj2835]

wow!! thx guys. now i got the practical knowledge from your video.

[@juaki_jean]

Thank you for posting, it was useful.

[@hugoorellan1029]

It is interesting to see how steel can deform under load applications in a test. Thank you for made it

[@MahmudulHasan-hi1bv]

Very much informative thanks a lot !!!

[@mechapylon7171]

amazing vid, love it! thanks!

[@osvaldosolis7605]

This essay is great because it exemplifies that not all materials work in the same way.

[@yahiaroukaibi4044]

Thank you so much for this video and for your explanation

[@ameetsharrma9632]

Explained in a simple way

[@damandeepsingh8542]

Very good. The video is brilliant

[@alvarparedes]

Great video, Thank you.

[@AboutComposites]

very important test, thanks guys!

[@embrezar]

This was highly informative, thank you.

[@aliceoriani6546]

onion

[@abduljabbarm4804]

AMAZING EXPLANATION

[@user-cg7jy4su6k]

Thank you very much for your help

[@laavsworld9817]

Hi,thx for the video,we are a die casting company,we want to change our micro structure to increase our tensile strength from 300 to say 400,can u tell us what we have to add to A356 aluminium to get increased tensile strength

[@ahmedsobea]

It’s a very helpful video. Thanks alot

[@cytyoisbills8197]

Very helpful, Thanks!

[@ryanwarren7600]

Great video!

[@vinayarya1384]

Amazing experience.

[@Anikung17]

I'm not even sure how i ended up here but this is fascinating

[@Rikzy_official]

Hello friends!!! Very good video Big Laik from me.

[@aliceoriani6546]

onion

[@anzebeton1869]

I'm a sample machinist for the local steel mill and this is exactly what I machine every day.

[@robertgardner7470]

Was millileter the force used or was it milipascals? On the second sample of Al did not show the yield strength. I would like to see 7068 (tennalum) test at 99,000 ksi tensil.

[@user-hndle]

좋은 동영상 감사합니다🙂

[@keithmatambo876]

Thank you for this

[@conceptsofcivilengineering]

Excellent explanation

[@DavidPrasanna]

At final stage of fracture if a straight line occurs with no elongation but drop of force and again increaseslittle bit and fractures means what can we decide from that

[@kaysseibrahim6477]

thanks you very much for you effort .....I would like to ask you about young's modulus....does its value change after heat treatment for medium carbon steel or in other carbon steel ...and is that change is wide or not... ......because i had .. that changing when i did my research for aisi1030 with hardening, tempering,annealing,and normalizing ....thank you

[@MaterialsScience2000]

Answer to "I would like to ask you about young's modulus....does its value change after heat treatment for medium carbon steel or in other carbon steel...?": In the case of steels, young's modulus does not change much with a heat treatment. There probably is a small influence, but this influence is so small, that it is almost impossible to detect it.

[@ronaldoandraderibeiro1301]

Very well explained

[@Virtueman1]

This is very well done, it helped my studies.

[@aliceoriani6546]

ma va a cagare

[@corentinisoard6192]

wonderfull thanks Angela

[@Jeff23301]

my mind just exploded. This is gonna be a fun semester

[@aliceoriani6546]

cipolla

[@kowalityjesus]

It seems like this would depend on how quickly the force is increased. How would the graph look different if the machine were applying force at 1/4 the rate. Would the neck snap?

[@DanishKhangec]

kowalityjesus the test machines can be of two types stress controlled and strain controlled, latter being more accurate, and also the rate of application of strain is very less in these type of tests

[@ramupaudal959]

kowalityjesus

[@OneManForger]

Question just to clarify, I had previously understood that a stress vs. strain graph, the stress was the Force DIVIDED BY THE AREA, which here seems to be the yield points... Is stress just the force measure or are these two different graphing methods?

[@sunnywang5463]

Cool machine!

[@keithc8133]

It would be valuable to add to the charpy energy testing video to include %shear area determination and may be include a drop weight testing video with %shear area determination.

[@magqaga]

Did the testing machine gradually increase the strain/extension in a steady controlled fashion at a pre-determined rate (and hence measure what corresponding force developed), or did it gradually steadily increase the applied force at a steady rate (and hence measure what corresponding strain was developed)? Explain

[@yosytadesse4508]

I have got good idea for this testing methods, parallel i have equation to ask tensile test for 6mm diameters of work pc what abut the length

[@vishnugupta2050]

very good article

[@amirnomansafdari2608]

I have a test done for Shear Stud Dia 19mm length 106mm steel material as per ISO 898-1 where the : Yield strength as per standards is 385 min Yield Strength @ 0.2% offset: 332.5 Mpa Tensile Strength: 521 Mpa, Elongation (in 50mm) 22.4% Reduced area 58.5% Can someone verify if these figures are correct?

[@bridgetdavenport6057]

Love this process. Crazy how edge and screw dislocations travel in the material. To imagine metal of that thickness being able to do necking and break is so cool. Interesting how material goes from elastic deformation to plastic deformation. It was nice being able to see when the yield point occured on the monitor. What was you factor of safety percentage?

[@MaterialsScience2000]

Answer to "What was you factor of safety percentage?" There is no concept of "safety factor" in the tensile test itself. You need safety factors when you use the results of the tensile test to design a mechanically loaded component.

[@nkdandekar]

Excellent! Thank you !!

[@aliceoriani6546]

onion

[@tedroskiros1258]

very interesting lesson ...

[@gunado1116]

why the fracture doesn't take place in the middle of the workpiece of the material but happen in one side of gauge length ?

[@blancaroca8786]

Excellent video really. So wonderful to see real results. Another question. Did the second material retain permanent plastic deformation near the fracture point? It seems to spring back and not retain necking after break which seems like a cleaner cut. Is this like a somewhat brittle material then?

[@MaterialsScience2000]

Answer to "Did the second material retain permanent plastic deformation near the fracture point? It seems to spring back and not retain necking after break which seems like a cleaner cut. Is this like a somewhat brittle material then?": The second material (Al alloy) retains all of the plastic deformation, including the neck. However, it is not as ductile as the first material and the neck is barely noticeable.

[@skoopysallu]

Thank you very very much.

[@hungvu-lu1ep]

who can present what thaey say for me pls? i am vietnamese and my english knowledge is not good Thanks

[@vishwassharma]

Great Video :)

[@TheRoKitMan08]

Amazing name, inspekt 200

[@jasonlai445]

Good explanation

[@AbarajithanGnaneswaran]

Please explain to me this. We are increasing the force gradually and observing the extension, right? Then how can the force reduce in the diagram? Now I see: the machine is not increasing the force gradually. But, the length is increased continuously and the force needed is plotted in the graph.

[@MaterialsScience2000]

Answer to "Then how can the force reduce in the diagram? ....": Yes, this is the correct explanation. The test is mainly "strain controlled". In a "force controlled test" a drop of force would not be possible.

[@AbarajithanGnaneswaran]

Thanks. :-D

[@vikramsaini5061]

How the needed force is calculated in the region after elastic limit?

[@mohamedakajembe1580]

Abarajithan Gnaneswaran for what I understood the machine is design to increase and reduse the force automatic as long as it keep elongation at costant manner.So that why it can detect that at some point elongation may still proceed at low force input.That is what I think.

[@parthprajapati40]

Abarajithan Gnaneswaran it is the resisting force offered by material. Not the external force

[@kriksizanderson5471]

So, does it pull the metal apart or push it down until it breaks?

[@FGX4000]

Cool. I like videos like this.

[@EgadsNo]

If this rod was a hollow tube or pipe how would the inner diameter be effected? Am I to assume that the point at which it would neck the inner diameter would increase roughly as much as the outer diameter decreases?

[@user-cg7jy4su6k]

I want to aske about elongation, the elongation at fracture and the elongation after fracture wich one should be taken depend on astm 615

[@M.t_khans_Electronics.]

Nice informative

[@SalveMonesvol]

Thank you.