Mechanical Engineering - Strength of Materials - Discussion

3. 

The neutral axis of the cross-section a beam is that axis at which the bending stress is

[A]. zero
[B]. minimum
[C]. maximum
[D]. infinity

Answer: Option A

Explanation:

No answer description available for this question.

Amit said: (Jan 8, 2013)  
M/I= Stress/distance from central plane (neutral axis).

Susheel said: (Jun 16, 2013)  
At neutral axis there there will be no effect applied of applied load.

Chinna said: (Jun 27, 2013)  
Neutral axis is the line interaction with neutral layer with transverse axis. In above neutral axis the layers are compressed and below the layers are tensed. There is no load acting on neutral axis. So bending moment on the neutral axis is zero.

Thejeshwa said: (Aug 14, 2013)  
Bending stress is zero because no effect on the neutral axis due to applied loads.

Ashok said: (Aug 28, 2013)  
AT neutral axis no develop the stress.

Naveen Kumar said: (Nov 4, 2013)  
There is no load acting on neutral axis. So bending moment on the neutral axis is zero.

Anjana said: (Nov 22, 2013)  
No load is acting at the NA So BM will be zero.

Jide said: (Dec 21, 2013)  
Depending on the material used (if elastic), when bending a beam, one surface eventually stretches due to tension while the surface opposite compresses without damaging or breaking the beam due to the fact that the proportional limit is not exceeded which implies that, there exist a neutral axis or zero stress.

Vishnu said: (Jan 13, 2014)  
Bending stress is zero, because the effect of load is zero.

Gunturu said: (Feb 7, 2014)  
The bending stress is zero at that point distance is zero hence bending moment is not possible for equation MY/I=BENDING STRESS FOR THIS CASE Y=0 HENCE BENDING STRESS IS ZERO.

Vijay Simha said: (Jul 25, 2014)  
Because there is neither compression nor tension at centre.

Ram Gupta said: (Aug 14, 2014)  
Because the neutral axis pass through the CG of symmetrical section.

Rajneesh Agrahri said: (Aug 28, 2014)  
There is no effect which load acting at beam cross section.

Mukh Ram Meena said: (Sep 20, 2014)  
At the neutral axis load zero, so BM will be zero.

Navin Chandra said: (Mar 9, 2015)  
Definition of the neutral axis itself says that "It is the axis on the plane of cross section, where strain, and hence stress is zero at the time of bending."

Shetty said: (Aug 21, 2015)  
The force acting on beam it tends to bend the body but there no affect on the neutral axis so its zero.

Nagenendra Singh said: (Sep 2, 2015)  
Because bending stress is proportional to distance between neutral point and outer fiber of beam. At neutral point its distance became zero so stress will be zero.

Ashish said: (Oct 19, 2015)  
Line or plane through a beam at which there is no extension or compression occurs when the beam bends.

Kundan said: (Nov 27, 2015)  
Applied load is crosses or on perpendicular to the neutral axis of beam. So BM is zero also the shear force is also zero.

Gebremedhin said: (Apr 27, 2016)  
Due to Hooke's Law, the stress in the beam is proportional to the strain by E, the modulus of Elasticity.
Therefore, from statics a moment (i.e. pure bending) consists of equal and opposite forces. So, the total amount of force across the cross section must be 0.

Ravi said: (Jun 7, 2016)  
A middle line of load zero because load separated all side so BM is zero.

Sharad Shinde said: (Jun 29, 2016)  
Bending stress at neutral axis are zero but shear stress are maximum at neutral axis.

Ramya said: (Oct 22, 2016)  
Why shear stress maximum at neutral axis?

Ankit Patel said: (Feb 17, 2017)  
Assume that horizontal beam is subjected to bending stress, due to load P (downward).

Bending is occur in downward direction.

From neutral axis upper part in tensile stress and lower part is in compressive stress but at neutral axis it.

Must become zero.

Ikwu Anthony said: (Mar 7, 2017)  
Because at the neutral axis, there is no effect of load and therefore there is no stress at the neutral axis.

Vijay said: (Mar 7, 2017)  
What about if load acts in transverse and longitudinal axis, can anyone answer it? please.

Krishna Singh said: (Mar 11, 2017)  
How can you say this?

Because this is only case of pure bending. Isn't it?

Krishna Singh Chaturvedi said: (Mar 11, 2017)  
In loded beam the situation comes when stress goes either tension to compression or compression to tension. And the point comes when sum is equal to zero, if consider for whole line, so tht line would be as neutral axis.

Ranganatha Kamati said: (May 10, 2017)  
The nuetral axis is an axis in the cross section of beam (a member resisting bending) and is geometrically centroid, because the bending stresses acting on an nuetral axis is zero.

Debiprasad said: (Jul 23, 2017)  
We know that, bending stress=M/Z.
Aat neutral axis Z=0,
So bending stress is zero.

Here 'Z' is the second moment of inertia=I/Y,
and Y=D/2.

Naveen Saniu said: (Sep 6, 2017)  
No load is acting that's why zero.

Aamir said: (Oct 22, 2017)  
As bending stress =MY/I, where y is the distance of extreme fibre from NA.

So at NA y=0 ,therefore BS =0.

Sumanta Dey said: (Dec 18, 2017)  
Because of shear stress maximum in N.A. So bending stress is min in N. A. And maxi in extreme fibre.

Prudhvi said: (Jan 28, 2018)  
Stress in any layer depends on its distance from the nutreal axis.

Sagar Bankar said: (May 30, 2018)  
Because at the neutral axis No strain and No stress.

Amal George said: (Jul 23, 2018)  
In the neutral axis, there is no force.

Asha Vasudevan said: (Jul 31, 2018)  
It is because of no compressive stress.

Mytharprasanth said: (Jul 27, 2019)  
Initially, no load will be acting in a Cross-section of the beam.

So, bending moment on the axis of the beam.

And, it will be zero.

the intial load is zero, and there is no force act itself.

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