Dr. Short has a certain trace amount of snark in his lectures that I find very enjoyable. It in no way affects the factual accuracy or completeness of his lectures, but rather contributes to making those listening care passionately about what he's teaching. And it does so much more effectively than mere uncritical positivity would.
Michael Short's description of his reasearch @ 47:05 puts into perspective the importance of organizations like MIT. These organizations support individuals like Dr. Michael Short to measure things that most people are not aware of the existence, let alone importance. I am so grateful this is shared for free, thank you.
I’m watching him while eating or baking/cooking a lot. It’s explained so good that i can do something else while knowing more stuff. My old teacher in high school frustrated me so much that i decided to quit applying to German technology colleges & became a ICU nurse later. Now i’m applying to colleagues again in this field thanks to the professor in this video.
Dr. Michael Short's lectures are unrivalled, in my view. Seeing them makes me want to go back to Imperial College, where I studied for a masters in nuclear engineering.
I've heard that cold welding works because low temperatures can cause atoms not fully integrated into a crystal lattice (so those along surfaces for example) to "wander" from their bonded place and then resettle into a new lattice configuration once heated back up to room temperature. Could you use that process to fix radiation damage to reactor containment vessels?
31:45 I don't quite get why the crystal plane is always 45° to the direction in which we push/pull. If piece of metal had been rotated by 45° before being manufactured, it would still deform the same way, right?
Yes it would. It's because at 45 degrees the resolved shear stress is maximum than at any other angles. So slip would occur on those planes preferentially which are oriented at 45 degrees with respect to the axial stress. Look up critical resolved shear stress or schmid's law for more details.
If we run out of a Charpy test sample, could we correlate an NDT test to a destructive Charpy test and perform an NDT test on the vessel? Something like the NDT hardness test?
A random thought: Jet engine blades are made from single crystals. Airplanes fly in a slightly more radioactive environment. Does there exist a possibility of an engine blade being damaged by the background radiation?
If it were a nuclear reactor generating neutrons, Iron has a high neutron cross section so would capture the neutrons and the reaction wouldn’t work. If the material is radioactive only, then you can use stainless steel barrels/containers to store liquid waste.
Maybe it's listed in the Readings section: ocw.mit.edu/courses/22-01-introduction-to-nuclear-engineering-and-ionizing-radiation-fall-2016/pages/readings/. Best wishes on your studies!
Because each reactor "history" is different, having had different operational conditions, power profiles (i.e. neutron and other radiation fluxes), different temperatures, and so on and so forth.
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Dr. Short has a certain trace amount of snark in his lectures that I find very enjoyable. It in no way affects the factual accuracy or completeness of his lectures, but rather contributes to making those listening care passionately about what he's teaching. And it does so much more effectively than mere uncritical positivity would.
Michael Short's description of his reasearch @ 47:05 puts into perspective the importance of organizations like MIT. These organizations support individuals like Dr. Michael Short to measure things that most people are not aware of the existence, let alone importance. I am so grateful this is shared for free, thank you.
I’m watching him while eating or baking/cooking a lot. It’s explained so good that i can do something else while knowing more stuff.
My old teacher in high school frustrated me so much that i decided to quit applying to German technology colleges & became a ICU nurse later.
Now i’m applying to colleagues again in this field thanks to the professor in this video.
that videosnip of the vacancy diffusion is incredible!
Dr. Michael Short's lectures are unrivalled, in my view. Seeing them makes me want to go back to Imperial College, where I studied for a masters in nuclear engineering.
Again, brutal lecture. Amazing explanations by Michael Short. Thank you.
Beautiful Class. Greetings from a Materials Engineering student at the Federal Rural University of Rio de Janeiro
I'm not gonna pretend I understood everything... I'll just keep coming back
😂😅
I had no idea of or interest in nuclear energy before. Then I found the lecture on Tschernobyl (no. 26?) and I can’t stop watching since.
What an utterly brilliant introduction.
Incredible videos, I knew we had pictures, but I didn't know that we had videos of these phenomena as well!
That's why Mr. Short is a Professor at MIT
I've heard that cold welding works because low temperatures can cause atoms not fully integrated into a crystal lattice (so those along surfaces for example) to "wander" from their bonded place and then resettle into a new lattice configuration once heated back up to room temperature. Could you use that process to fix radiation damage to reactor containment vessels?
Absolutely well done and definitely keep it up!!! 👍👍👍👍👍
31:45 I don't quite get why the crystal plane is always 45° to the direction in which we push/pull. If piece of metal had been rotated by 45° before being manufactured, it would still deform the same way, right?
Yes it would. It's because at 45 degrees the resolved shear stress is maximum than at any other angles. So slip would occur on those planes preferentially which are oriented at 45 degrees with respect to the axial stress. Look up critical resolved shear stress or schmid's law for more details.
Put sci in work so neat 👍👍👍
If we run out of a Charpy test sample, could we correlate an NDT test to a destructive Charpy test and perform an NDT test on the vessel? Something like the NDT hardness test?
A random thought:
Jet engine blades are made from single crystals. Airplanes fly in a slightly more radioactive environment. Does there exist a possibility of an engine blade being damaged by the background radiation?
The background radiation, albeit higher than that on the ground would not be of sufficient magnitude to damage the blades.
Great lecture.
What would happen if you were to put hardened (rolled) steel, or aerogel into a highly radioactive area?
If it were a nuclear reactor generating neutrons, Iron has a high neutron cross section so would capture the neutrons and the reaction wouldn’t work. If the material is radioactive only, then you can use stainless steel barrels/containers to store liquid waste.
Where can someone find a paper that includes the efficiency plots shown in 48:27? Have been trying to find a good source for this for a long time!
Maybe it's listed in the Readings section: ocw.mit.edu/courses/22-01-introduction-to-nuclear-engineering-and-ionizing-radiation-fall-2016/pages/readings/. Best wishes on your studies!
Maybe it's just me but... Buster Bluth?
Why not use a decommissioned reactor for new charpies? France has plenty
Because each reactor "history" is different, having had different operational conditions, power profiles (i.e. neutron and other radiation fluxes), different temperatures, and so on and so forth.
@@1080pMarco I hadn't considered that. That make sense. Thank you!
The good, the bad and the ugly.. I see what you did there at 49:38
Watch Hidden Colors 1, 2, 3, 4 and 5 by Tariq Nasheed.
From Russia with reactor!)
Michael Short sounds seriously disappointed that the differential energy transfer cross-section is a simple linear model.
Part of me thinks he enjoys hard math 🤣
Try hard