How and When Metals Fail

From the millions of miles of aging pipelines to the intricate workings of a wind turbine, metals are ubiquitous. Of paramount importance in both the design and upkeep of these materials is a predictive capability for their failure. An improved understanding of ductile failure will offer increases in efficiency, reliability, and applicability of metals and their alloys.
This student video was one of the 2013 IGERT Video and Poster Competitions winning submissions.

[@TonyQuin-nu9tj]

Thanks! That was awesome. I’m 10 years late.

[@Grombo79]

I had never thought of metals as containing small voids leading to failures before. Somewhat eye opening. Thanks for the video!

[@Ariccio123]

Jet engines have lots of high tech metals to deal with high temperature and high load. I think they use single-crystal blades in combat aircraft for this kind of reason! I believe the methods used to manufacture them are highly classified, because anybody who can make them, has a massive advantage 👍

[@05032885741]

Nice explanation. However, for 2 phase component that is a compound with 2 elements. The failure could occur from voids, cavities, de-coherent of second phase particle or even an inclusion (external particles added for extra functions) and the image shown at 1:06 could represent any of mechanism mentioned earlier and not only voids. Voids and cavity are different, void arise from when arranging the structure, whereas cavity is formed due to the removal of a particle.

[@graemelubbe7875]

If anyone wants to study concepts such as this in depth, "Deformation and Fracture Mechanics of Engineering Materials" by Richard Hertzberg is the best place to start

[@Broockle]

Was looking up Metal Fatigue actually. A vid about that would be rad.

[@maxiglad1624]

This is interesting! I think of metal fatigue every time I twist my guitar strings at the tuning peg to eventually break it perfectly without a point sticking out to prick a finger.

[@tugbatasbas3747]

Thank you, I got all the information needed the most from your video.

[@SGTRandyB]

Did you ever expand this simulation out to use randomized size / shaped voids more akin to realistic forged metal voids? It seems like one could take several types of failures and use the fail patterns to approximate the original void structures.

[@MehranHaghpanah]

Great 👍 👌

[@sanathkumar7588]

Thank you, I got all the information needed the most from your video...

[@jamesperkins2552]

Is what you do called “finite element analysis?I am not a materials science professional but I do watch lots of material science videos, and I’m trying to connect the dots between many different presentations.

[@Waterdust2000]

I liked this video.. tell me some more.

[@enjoymfs9715]

if we create a part without any defects, could we prevent fatigue?

[@amiraboodi2075]

Very interesting.

[@chetanchennur6012]

Clear voice, Nice explanation and understood well

[@abhishektiwari826]

I didn't understand the concept of voids in metals. We all know an atom is almost void or hollow, size of nucleus only corresponds to the size of a football placed in the middle of a soccer field. If we look in this way, why only metals, even non metals have lots of voids. But non-metals are neither ductile nor malleable, so the concept of "fail" doesn't apply to them. Please enlighten us more on what you mean by voids.

[@AHDKDYRARYDJISOEWKEN]

the voids he is talking about are on a microscopic scale NOT an atomic scale. The voids might be a few micrometers in diameter.

[@ruilovesschreiner6847]

very interesting study. and this was 3 years ago. I wonder how the accuracy of prediction now and is it commercialized?

[@MrNimblelinn]

So you are not providing any source data? Just screenshots of someone else’s work? With no comparative data?

[@eiric6958]

So theoretically, metal with no 'bubbles' in it, is the 'strongest' it can be.

[@6969SpAcE6969]

That's a very simple description of what happens but doesn't explain why. For anyone wanting to know more in depth, they should look for videos on dislocations within metals.

[@noamorwell]

How are dislocations related to voids?

[@TheGuruNetOn]

@@noamorwell I think it's related to dislocations from a regular crystal state to a less than regular crystal lattice structure. If a crystal is grown in outer space there are less/zero dislocations or imperfections in the crystal lattice structure as compared to a crystal grown under influence of gravity. These irregularities in lattice structure act as weak points when the metal is put under stress. Just my 2 cents worth. Corrections are welcome.

[@veerumekala4658]

Great teaching Pls failure investigations videos

[@CHAS1422]

Very interesting video. As our buildings and infrastructure age, I wonder if fatigue will begin to show. Will the steel in the Empire State building that was once ductile begin to chrystalize and become brittle with time? The structure is approaching 100 years old. The woolworth building is now 100 and the cables in the Brooklyn bridge are even older. Interesting study

[@rahulsoni5459]

strain hardening

[@rahulsoni5459]

strain hardening

[@chibuyembasela3864]

CHAS1422

[@chandanprasanna9755]

thankful bro

[@pellyrat1]

great teaching aid. thanks

[@dhanapaln9281]

i am understand your videos,so very useful me

[@ALIALI-hi3yz]

thanks

[@hhjhj393]

I heard that aluminum engines have a set lifespan because of "metal fatigue" while cast iron engine blocks do not and can last forever (if allowed to) is this true? I also read that steel as well doesn't experience metal fatigue. Does anyone know if their is truth to this? A couple years ago I bought into the whole, "old trucks/cars were better than new ones", yet my personal experience with an old truck has been horrible while my personal experience with most asian newer econo cars has been far better. My old Ford truck constantly has problems, but I have a honda civic that doesn't have any problems. Also the overall driving experience of the civic is far superior to the truck. I thought for sure that buying an old truck was a good idea because they are "more reliable", yet that hasn't been my personal experience. I am trying to figure out what is going on. I had an 02 hyundai elantra that I bought super cheap and it never gave me much problems, I am currently driving an 06 honda civic that has 200k miles and it's literally giving me NO problems period, it's awesome. I have a 91 f150 4.9 180k miles and I have barely driven it yet I have had to completely remove the transmission, replace parts multiple times, work on the cooling system, work on brake issues, work on a bunch of smaller miscellaneous safety issues, like dash not working, prndl selector not working, key not working, the truck wouldn't start because of a special part attached to the steering column, etc. Not to mention my truck uses almost 3 times the fuel as the civic. The truck has caused me far more stress and time loss than the civic and elantra combined. Yet in theory this shouldn't be happening. The cars had more plastic parts, aluminum engines, more gadgetry, etc. So in theory I would expect these cars to not last longer than the truck which is simpler, cast iron engine, etc. My theory is that the parts on the old truck are just worse and that the designs are worse. Though the truck may be simpler and possibly made of better materials, my guess is that the design and tolerances of the parts are not as good as newer vehicles? My other theory is that plastic parts aren't so bad because they are probably easier to get better tolerances and design on, metal parts are probably far harder to produce meaning there is an increased probability of poor quality control vs plastic parts.

[@billgates684]

oonce oonce this music is pog

[@elitehumpty3603]

Yes i agree

[@thoughtheglass]

Who else is watching this and thinking about their buhurt kit?

[@TiagoSilvamagico]

Admite, vieste aqui ter porque estás no *Técnico* ;)