Yield Point Phenomenon | Cottrell Atmosphere | Strain Aging | Edge Dislocation | Material Science

This video is Lecture No. 3 on Material Science at this channel Mech Online Lectures. This explains Yield Point Phenomenon in detail and in highly simplified form that how and why upper yield point and lower yield point come into picture while plotting stress strain curve for a ductile material like mild steel.
The lecture also explains reasoning of very fundamental and important technical questions related to this as,
Why Yield Point Phenomenon appears in low carbon steels only, but not in high carbon steels and even not in medium carbon steels?
Why Yield Point Phenomenon disappears for even low carbon steels while its loading during immediate second cycle?
Why Yield Point Phenomenon again comes into picture after its disappearing in low carbon steels, after a certain time period (Strain Aging Time) passes?
Watch reference lecture videos at following links:
Watch lecture on (Edge Dislocation and Berger Vector) at
• Edge Dislocation | Bur...
Watch lecture on (Stress Strain Curve) at
• Stress Strain Curve | ...
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[@MechOnlineLectures]

Dear all, Kindly subscribe another channel of Sir for more lectures (link below) : youtube.com/@profraksaini

[@dharampalpunia6511]

Excellent lecture by Ajay sir.Every student must watch this video.

[@naturelover7315]

excellent explaination in easy language

[@MechOnlineLectures]

Thanks

[@AvinashKumar-wf8pv]

Good one

[@ParminderSingh-ob3mk]

Very well explained lectures,,,,excellent start up

[@Sonig2000]

Very excellent vedio.

[@MechOnlineLectures]

Thanks and best wishes..

[@tapudas7037]

Very good and nice teaching Sir......smooth to understand....

[@111rhishishranjan2]

guys kaa teacher hai,itna acha, maza aa gya

[@aryanraj2750]

Sir I also saw videos of iit professors on yield point phenomenon but none of them were able to explain it like you.

[@RajkumarKumar-hy9xz]

Really this video is very helpful .....thanku sir

[@pikuhait7469]

Clear ho gaya sir.. strain hardening ki wajase lower yield point se uts tak stress bad raha hai....due to restrictions of dislocation motion...kon or kaiye dislocation ki motion ko rok deta hai or kaiye uske liye stress bad raha hai uske upar video de dijiye sir please 🙏🙏

[@amitkumarsharma213]

Amazing explanation 🔥

[@pikuhait7469]

Or sir hindi vi simple tha I am from West Bengal but simple hindi tha to samajh gaya

[@sauravkumar-ed9yd]

Very informative video Sir ji

[@priyvratmeena3978]

Excellent lecture Thank you sir

[@fundamentals4u176]

Wah sir dhaga khol diye ekdum

[@shamsulhaq0377]

❤

[@ashokkumarshukla8851]

Excellent lecture, very knowledgeable

[@ujjwalbhaiyya43]

Excellent Sirji....what a energy with which u r teaching

[@MechOnlineLectures]

Thanks for compliments.. Best wishes....

[@Sipunsahu-zc1ep]

Sir just mind blowing 🙂

[@indrakumartak9865]

Impeccable lecture sir 🙏

[@Sipunsahu-zc1ep]

Bhot achha lecture tha sir.. 🙌

[@sorabhprasad2244]

Good explanation in easy language 😊

[@amarjadhav281]

Excellent teaching

[@MechOnlineLectures]

Thanks for appreciation, which is an inspiration for me to deliver the best..

[@gamer-fq3gl]

Sir Screw Dislocation samjha dijiye please 🥺

[@kamaljit7322]

Great sr...excellent explanation

[@mechabite8033]

19:00 main part

[@vedanandasandilya7181]

Thanks 👍

[@janmejayasahoo8549]

Sir nice video ..but stainless steel bi to low carbon rehta he usme nehi ata qun?

[@mcdeltat3903]

Thanks... Is this residual streess which is remaining after overcoming the cotterell environment is reason behind "yeild point elongation" beyond point D?

[@MechOnlineLectures]

Having the barrier of Cottrell atmosphere overcome, dislocation is now capable to speed up within the material which causes yielding (D-E). The phenomenon can be understood as such in simple words. However, E-F is further fast increase in stress which is because of strain hardening (work hardening) which has been explained in another video.

[@MechOnlineLectures]

Watch following for work hardening kzbin.info/www/bejne/f2PZi6t7lr-hoqs

[@MechOnlineLectures]

Thanks for watching the video and writing to me.. Stay connected ...

[@mcdeltat3903]

@@MechOnlineLectures thanks sir

[@mcdeltat3903]

@@MechOnlineLectures thank you sir now its clear to me.

[@gangadharmaurya3089]

Mere pas jawab nahi 🙏🙏🙏😍😍😍

[@MechOnlineLectures]

Thanks for feedback..