FE Exam Review - FE Mechanical - Material Properties - Phase Diagrams

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[@virtualtreadmillwalknature1488]

Good video 🎉

[@coolguy6819]

Sir could you please do A four-bar linkage. Thank you

[@zhwandoonamirjan114]

Thanks Instructor

[@directhubfeexam]

You’re welcome!!

[@josea.serrano-perez3544]

Isn't the % wt Sn for the eutectic point 61.9 ? (Note that the graph has that value marked in that point)

[@gooddeedsleadto7499]

Could u please explain the logic behind the lever rule?

[@mutalejohn5295]

Thank you.

[@directhubfeexam]

You're welcome!

[@tshepipowerhouse9004]

Hello. Sir do you have more videos on this topic, eslecially problems were one is given inorfation amd asked to draw the graph??

[@tshepipowerhouse9004]

Especially **

[@gooddeedsleadto7499]

Why is xL -x used to calculate W alpha?

[@dand7056]

That seems backwards. Why isn't the longer line close to alpha on the left of the graph the bigger percentage?

[@directhubfeexam]

The green line? The percentage increase from left to right. The green line does have a bigger percentage than the pink one. Green (25%) and Pink (14%).

[@dand7056]

@@directhubfeexam the green line is 64 percent and red was 36 percent. I would think the red line is the alpha but it's not it is the liquid.

[@directhubfeexam]

@@dand7056 ahh I see the confusion. Yes that definitely confused me too. The way I would do this is by using the FE Handbook page on 105.

[@directhubfeexam]

Here is a visualization that helped me. It involves a "lever", I guess this is where the lever rule came from. www.directhub.net/fe-exam-reddit-and-youtube-questions-answered/#Phase_Diagrams_-_Tie_Line Taking the moment about the center (fulcrum) we will get W_L x R = W_s x S. If you examine the image, the weight that the liquid must overcome to stay at equilibrium will equal to the R/R+S. Hope that helps.

[@mskgt8466]

Visually it makes sense for alpha to be larger than L but I believe this is a inverse lever rule meaning that if you are interested in the fraction of phase on the left, you have to take ratio of the right-hand segment to the entire length of line and vice versa.

[@sekhar4876]

Is this applicable for FE Civil?

[@directhubfeexam]

No, this is more on the mechanical side. Thanks for checking!

[@sekhar4876]

@@directhubfeexam Thanks for clarifying

[@tshepipowerhouse9004]

Sir do you have more videos on this topic, eslecially problems were one is given inorfation amd asked to draw the graph??

[@Bokkie312]

god i hate material science

[@victorkogei9631]

Its boring bytha😂😂