In made easy solutions they have given answer as 190 MPa without even discussing anything about Stress Concentration Factor

dear sir, you are making those topics interesting as well as knowledgeable. this really makes me buy ur exergic videos. thank you for this question , it was really helpful. i

Thanx sir I just have debate this by others for options b and c And I m also getting c But you have fully opened the concept. Thanx again

The problem is interesting because when the plate is large, d/w

Thank you so much for delivering classes in English .... excellent quality contents.

Very interesting way to explain plz further bring this type of question

U cleared it in a lucid way sir..

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This one was very interesting. Thank you for uploading it..:D

Thank u sir. U r Making mechanical engineering more interesting. Respect sir

At the point of 0 shear force ...we get maximum bending moment or bm can be either maximum or minimum

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Simply amazing! Thanks a lot.🙏💕

Thank you sir 💙💙💙

Sir, we can find the exact answer by theory of elasticity formula for circle discontinuity , we prefer for lecture stress concentration nptl

Thank you sir.

Wow the explanation is so good and nice

In brittle materials stress concentration at tip of the crack is??

Perfect explanation,,,

Amazing

I think that if the answer, 285 is exactly correct then the logic provided here is incorrect. Because in that case, large plate doesn't mean that d/w 0+) so that, nominal stress tenses to 95Mpa from its positive side (nominal stress --> 95Mpa +) and Kt tenses to 3 from its negetive side(Kt --> 0-) so that the maximum stress tenses to 285 Mpa from some side. I'm saying this because as per the graph it seems that the answer is 285MPa whenever d/w=0.1 . So, it is also not exactly 2.85 when d/w

I am wondering that how many geniuses has actually solved that question at that time

Thank u sir for this, I have also done mistake of multipling 3. Please upload some other confusing questions like this.

Thank you very much sir

In the book of made easy , they give the answer 190mpa...

Actually I have a doubt regarding nominal stress. Nominal Stress is the stress calculated on the basis of the net cross section of a specimen without taking into account the effect of geometric discontinuities such as holes, grooves, fillets, etc.But here we have taken into account the hole diameter.So can you please explain it.

In case of 5 cm , what will be the answer??

Sir , in nptel machine design pdf while explaining stress concentration they have done bit different. According to them , the ratio of max stress and nominal stress is termed as theoretical stress concentration factor but while using relation ,sigma max = sigma (1 +(2b/a)) , the mentioned sigma is stress that the body is subjected to without considering the hole condition ( no net cross section area condition ).Same way things have been explained in Shigley's mechanical engineering design book. Please guide as this way hole size wouldn't matter for calculating maximum stress generated due to hole .

Sir in ductile material stress concentration factor not much affect .can we consider as nominal stress as answer(190)

Questions like these are the sole reason why most aspirants lose faith in gate exam.

Is it me or did he just multiplied stress with area to get stress again?! 🤔 The answer is 285, nominal stress is 95 and multiplied 3 is max stress. But second look he equated forces, but nominal stress flowing will still be 95 through out, there is no question of adding stress concentration if there is no change in the flow. Still confused 😕 please watch Jeff Hansons video on stress concentration on why I'm confused. Please explain stress concentration with this video, I know there is one done already, but with this to be clear please

From graph for d/w=.05 K=2.85 so Smax=285 MPa Or Kt=3-(3.13d/w)+3.66(d/w)^2-1.53(d/w)^3 Kt=2.8524 Then Smax=285 MPa Or Kt=1+2(a/b)=>3. Since a=b (circular initially before load) t not given so for unit thickness Kt varies from .95 to 1 i.e Kt= 2.85 to 3 Then Smax=285 MPa Smax/Snom=Kt Snom= P/wt=P/(w-d)t

Hi sir..Kt can be ignored for ductile material under static load..

What happens if we did not consider stress concentration factor?

Helpful

Bhaiya nominal stress is known as maximum stress

IN NPTEL LECTURE BY PROFESSOR RAJESH PRASAD THEY CONSIDERED SIGMANOT AS EXTERNAL APPLIED STRESS

Gr8

Wow

kt=2.85

Thank you. This is very interesting. One can find more on www.fracturemechanics.org/hole.html Using empirical relation, \sigma_{max} happens to be nearly 285.1995 MPa

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Chapter wise videos kaha milenge,, full lecture

This question I believe was put there to make mistakes.

sir I am afraid but your solution is wrong To obtain the maximum stress in a circular hole we need to multiply with applied stress only i.e. 95Mpa in this case I am saying so by taking reference from the book of Applied Elasticity by Martin.H.Shaad There in polar form of airy's stress function you can see this example page no 177 of 2nd edition

Sir sigmanot ki vale aapne 95 Kyu nahi li aap sigmanot ki value nikal rhe hai

@EXERGIC SIR WHAT IS Kt?? Can you help me with that

Thank u so much sir..... Thanks for concluding it, i believe 285 is the right answer.... But in karnataka pgcet mechanical 2017 paper the answer is 100 Mpa.....

Sir then In this case ,The correct ans is indeterminate as the answer is not matching

I don't know I should be happy or sad after seeing this question.

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