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 | Burger Vector | Extra H...  

Watch lecture on (Stress Strain Curve) at
   • Stress Strain Curve | Mechanics of Materia...  

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