Mechanical Properties of Materials and the Stress Strain Curve - Mechanics of Materials

This video provides an introductory explanation on the significance of mechanical properties as it relates to engineering design. It also describes the characteristics of the stress-strain curve for a typical steel.

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[@structurefree]

An explanation of the significance of mechanical properties in engineering design and identifying significant characteristics for a typical stress strain curve.

[@5cr3am1ng3agl3]

Good video, can you please explain me the difference between Strenght, Hardness, Toughness, Stiffness and Ductility properties of materials ?

[@ChasmaVlogs]

5cr3am1ng3agl3 okey! i am not a pro here! just saw ur comment ! so trying to help! Strength is the ability to withstand load without failure. say higher the strength, higher is the ultimate stress point. Hardness is the resistance to scratch or cutting or abrasion or penetration, Stiffness is the ability to resist deformation under load. say an Al bar sags when load is hung at its one end but a steel bar doesn't for the same load. Toughness is the the ability to withstand both plastic and elastic deformation before fracture. u can term it as the amount of energy a material can absorb before failure. Ductility is the ability to withstand basically tensile load without fracture, better understand it as the ability of a material to be turned into a wire, Hope it helped! Cheers! :)

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Could you do a video on how to find permanent set after a structure is unloaded? I know young's modulus E is involved but I'm not sure after that. Thanks!

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a great help from this video,synopsis-ed,well explained.Thank you.

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Excellent presentation! Thanks for posting it.

[@AK-gt8zy]

This is great! Do you have any videos over unloading/loading stress strain curves?

[@heyitsvamsi]

Thank you so much man! I missed my lecture and was lost until I saw your video.

[@heyitsvamsi]

Subbed

[@ashnpikachu]

hi there, thank you for your time in making the video. It is clear and direct to the point about mechanical properties. energy in the voiceover makes it engaging! would like to point out on the sound quality as it is very sharp... a little difficult to listen to. i can advise using a software to tweak the eq. that would provide overall nicer sound quality!

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Thanks a lot, this video made it easy for me to understand

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[@TheDrB0B]

It would really help if you could do a video where you solve a problem about this! For example: For a 0.031 in diameter wire that breaks with a fracture stress of 36000 psi and reaches a percent reduction in area (%RA) of 75%. Determine true stress and true strain in the moment of fracture. Thank you so much for this!

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the intro tho, haha very passionate. love it!

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Loved the explanation

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Dope video man! really explained what I was looking for! How would you model stress and strain for materials like wood which I hear have non-linear elasticity? Also, when you're editing your videos it might be good to shoot for the semi-universal -12Db peak volume mark for uploading online to avoid blasting folks, and watch out for your mic's gain being too hot and clipping your voice. :)

[@bossji555]

Hi i want to know that if i want to find stress strain which method is easier compression or tension thx :)

[@shylildude]

there's a separate graph for shear stress and strain right?

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[@user-kn2lz2jv7i]

Thank man ..but what about if we have force VS strain ..!? Should the calculation of the yiled change ?!

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Translation? :)

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[@stephenspears3814]

I have a small doubt Sir. In the yeilding zone , it is said in the video that loading is constant and a large deformation in experienced by the specimen. but I the strain controlled tensile test the specimen is loaded from zero to ultimate load,that means load acting on specimen is increasing continuously ,so how a constant load acts in the yielding zone? shouldn't it increase ? or is it like the instant the loading generates the yield stress that huge amount of yielding happens in the yield zone ?

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[@fortunateolifant2389]

is the plastic region not from yield strength to fracture?

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[@PwnKeb]

I feel like I should understand this given that no one else ever seems to ask this question, but can you please explain why the stress decreases after the yield point and the UTS? Doesnt the machine continue to apply the same force or increasing force? How does this result in decreased stress, especially if the cross sectional area is decreasing in the necking region.

[@structurefree]

as a quick response...the material weakens and it requires less force to deform it. the stress is decreasing in the necking region since we are using the original area to calculate the engineering stress.

[@royalmech2767]

this is not true stress strain diagram

[@kaalidhassubramanian]

after UTS, why the stress is get reduce...?

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Just WOW!!!. Subbed

[@structurefree]

Thank you!

[@armanrizvi613]

If the problem is to take 3% of Strain hardening then how the curve look like ? I mean, the nature or behavior of curve ?

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i think you made this on ipad right, which stylus you use. can you telll plz

[@hashimkawhtarali5291]

Best explanation

[@rafeeakand6801]

really helpful...thnak u :)

[@aswins990]

Sir i have a doubt..Hookes law states that stress is proportional to strain within elastic limit..But in actual diagram we see that the line is straight only till the proportional limit and not elastic limit..which also means that slope can be taken only till the proportional limit right?..

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Player's gonna play.

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Thank u sir

[@BibhuArya]

I have two questions here Sir! 1. What happens at microscopic level at upper and lower yield points and further more stress is required to produce deformation in strain hardening? 2.After ultimate strength why the curve downgrading up to fracture?

[@omaralomoush2350]

+Bibhu Arya the second question is exactly what im looking for, if you found the answer please reply

[@BibhuArya]

+Omar Alomoush sure I'll.

[@uthman131]

for the second question, answer is because this graph is based on the original area from the beginning, this graph can be called engineering stress-strain diagram. >>there is a True stress-Strain Diagram which is based on the actual area corresponding to force applied where you can see the stress is going up all the way till it fractures. hope that was clear enough mate.

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[@Mech.Masters]

How do we come to know the exact value of yield stress of a material??? Because it is difficult to find the actual point when the yielding starts???

[@structurefree]

Jitu M depends on the material and standards that you are using when conducting the test. the 0.2% offset is a popular method that is used to identify yield points.

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at first this seems like a joke... but it gets really good thank you sir.

[@user-zv1wl9so1d]

thank you for this video , I have question . While applying load on materials , the stress must increasing and that we can see in curve , but between proportional limit and yield the stress. Here the question , why the stress decreasing ? I know that is engineering stress sigma=F/Ao , so the only change is load . How become

[@structurefree]

أيمن العتيبي it's a dip associated with steel...it's kind of like a slight break and then the grains realign.

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Sir please i need your help on my project which is going to be due by the end of this week. here it is. A BARBELL STAND SUPPORTING THE WEIGHT OF A BARBELL AS SHOWN IN FIGURE. CHOOSE A MATERIAL FROM APPENDIX AND DETERMINE THE MISSING DIMENSION FOR SAFETY FACTORS OF 1.5, 3, 3.5 AND 5. CHOOSE A SAFETY FACTOR AND WRITE A PARAGRAPH DETAILING WHY YOU CHOSE THE SIZE STAND THAT YOU DID. THANKS SIR

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