# Mechanical Engineering - Strength of Materials - Discussion

Discussion Forum : Strength of Materials - Section 6 (Q.No. 5)

5.

At the neutral axis of a beam, the shear stress is

Discussion:

24 comments Page 1 of 3.
Niraj said:
5 years ago

At neutral axis, there is no stress of any kind. Then how maximum?

(2)

Pratik said:
3 years ago

The Answer should be Zero as on the neutral axis radius will be zero so shear stress will also be zero.

(1)

Dheeraj said:
6 years ago

Yes, answer is right, shear stress =SAy'/Ib,

Where, S=shear force, A =area, y'=distance of centroid of area from NA. I=moi, b=width, Here, A and y' are varied wrt y, when you take the values of both in equation and after differenciating it, you will get, y=0, (consider a elementary area at a why distance from NA).

Where, S=shear force, A =area, y'=distance of centroid of area from NA. I=moi, b=width, Here, A and y' are varied wrt y, when you take the values of both in equation and after differenciating it, you will get, y=0, (consider a elementary area at a why distance from NA).

Harsh said:
3 years ago

I agree with you @Amit Choudhary.

JAYDIP PARMAR said:
4 years ago

I think C is the right answer.

Kunal said:
4 years ago

Maximum is the right answer.

Mahesh RP said:
4 years ago

Why max is measured from the top or bottom fibre. Shear stress is max. At the centre and min. At the top and bottom fibre.

Abbas Ali said:
5 years ago

Answer should be None.

Only in pure bending stress or something else alone(Centrod = N.A). It is generally told so it may not always the case.

Correct answer D.None.

Only in pure bending stress or something else alone(Centrod = N.A). It is generally told so it may not always the case.

Correct answer D.None.

Anantha said:
6 years ago

Shear stress is zero in neutral axis and B.M is maximum are called as neutral axis.

Arjun biswas said:
6 years ago

Shear stress = F/2I (d^2/4-y^2) where, F= shear force, I= moment of inertia, d= depth of beam, y= distance from the neutral axis.

So, the maximum shear stress occurs at the neutral axis and is zero at both the top and bottom surface of the beam.

So, the maximum shear stress occurs at the neutral axis and is zero at both the top and bottom surface of the beam.

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