Bending Moments Explained Intuitively (Zero Mathematics)

There is a reason why bending moment are taught in the first weeks of an engineering degree. Their importance and understanding is crucial for any engineer. This video intuitively explains what bending moments actually represent in an engineering context. The video uses only simple examples and avoids and use of any mathematics. Bending and shear diagrams are not covered in this video since the purpose is to build intuition rather than computational skills.
References:
[1] A. Öchsner, Classical Beam Theories of Structural Mechanics, Springer, 2021.
[2] J. M. Gere and B. J. Goodno, Mechanics of Materials, Cengage Learning, 2013.

[@AadrianB09]

- Bending moment bends the section - Torque twists the section Thanks for the video!

[@hafeeznoormohamed1259]

Agreed!

[@hafeeznoormohamed1259]

Looking forward to the next video about beam stresses!

[@bruce-le-smith]

Very helpful, I don't have any training or experience in this domain, but I find it very interesting to understand conceptually what is happening in a structure. Thanks for making this accessible to people like me!

[@TheEngineeringHub]

I'm so happy to hear you found it useful, Bruce!

[@csehszlovakze]

I'm looking forward to the more complex examples!

[@jessekessler189]

Great visuals, great explanation. Some nice timber in that video too!

[@TheEngineeringHub]

Thank you Jesse

[@ravshanbekmavlonov2996]

Great video. It's worth watching. Respect

[@kishanpanchal6721]

Very helpful to visualise stresses in beam .Respect from India. I think... Torque is the moment which acts along the longitudinal axis of component and hence, it causes twisting effect. While bending moments are the moment acting along the lateral axes of the component and cause bending effect.

[@wacky6136]

This bending moment is explained very well in the book "Strength of Materials" by Ferdinand Singer.

[@camilleflores2340]

The topic was explained very well and the addition of simple ideas without over complicating anything helps me understand. While the thorough explanation of every diagram helped me fallow every idea being introduced.

[@growingtruedisciples]

This was soooo helpful. Thank you!!!

[@ubaidhanif5886]

I've never seen before this video to explained like as Good....!

[@manishagarwal527]

Very clear explanation. Now please make a video on radius of gyration of beam

[@user-bi2ug2hw9u]

Torque is vector. Bending moment is two forces, so it is two vectors, and we need some share forces to provide connection between them.

[@tutingrubena1584]

torque produces torsion in beams while moment bends the beam

[@user-xj4ep5wb2j]

torque is acting parallel to the cross section (caused by shear forces) , while bending moment is acting perpendicular (caused by axial forces) that is the distinction between the two, they are both rotational forces

[@engrfawadiqbalkhan786]

Thank for such great videos ,Please make a conceptual video on Finite element method.

[@ravshanbekmavlonov2996]

The best explanation regarding moment

[@TheEngineeringHub]

Thank you ravs 🙏

[@cwoods1132]

In simplist terms I remember - Moments and Torques are both rotational. A Moment is static and a Torque is dynamic.

[@charlesallan6978]

Bender Rodriguez is the most renowned consultant in the field and should have been mentioned ! Please correct this oversight and reissue this video with the aforementioned information.

[@theimmux3034]

this is definitely one of the bendings moments ever

[@ahmedyehia9560]

Torsion is occurs when the object rotates about its longitudinal axis (generally called z axis) Bending ocurs when the obeject rotates about cross sectional axis (grnerally called x or y axis )

[@JUNAID_KHAN708]

Which software do you use for animation

[@irfanullah8255]

Moment about lateral axis is termed as Bending moment while moment about longitudinal axis of a member is termed as Torque. BENDING moment bends while torque twists an object.

[@oswald2358]

Amazing

[@mohamedkhan4762]

Thank you bro.

[@TheEngineeringHub]

Always welcome

[@amesweb]

Torque is around a center point, Bending is perpendicular to an axis.

[@DR.BELJAN]

In your example with paper sheets, you have 5 sheets (ood number). In that case, the middle sheet has no change in length. What will happen if you have an (even number) of sheets?

[@TheEngineeringHub]

A useful way to think about it us at the limt case. By limit I mean when the thickness of the sheets gets infinitely small. Say 0.0000001 mm. In that case it doesn't matter too much whether there is 1 or 2 sheets at the middle. It just means that there is a theoretical point (line) where the stress is zero. Hope that helps 🙏

[@Jasmixd]

This is a certified bending moment.

[@erikziak1249]

4:14 Ends free to rotate? The image shows something different.

[@TheEngineeringHub]

Thanks for bringing this up Erik. In Structural Engineering, bolted connections only to the web of the beam are considered as pin connections and allow rotations. The top and bottom flanges would also need to be bolted if the connection was to be considered as fixed (see 4:46). The connection at 4:14 allows the beam to rotate a fraction of a degree which is enough to provide relief from the bending stresses.

[@asmokneel2464]

Can you please give me an example where Bending moment is minimum for Zero shear force at a section. Referring "At zero shear force bending moment can be maximum or minimum."

[@TheEngineeringHub]

Where is this reference from?

[@asmokneel2464]

@@TheEngineeringHub A FRIEND OF MINE ASKED ME AND I AM STILL SEARCHING FOR THE ANSWER 😂

[@TheEngineeringHub]

@asmokneel2464 I would say at a support of a simply supported beam. The moment is 0 and the shear force goes from 0 to the value of the reaction, so technically, it has both values at that point.

[@asmokneel2464]

@@TheEngineeringHub so the statement is correct right?

[@TheEngineeringHub]

@asmokneel2464 barely 😅 but one can argue for it. But it doesn't seem of practical importance, at least not on a first glance.

[@rajshekar-nm3fh]

Please note/: NA is not lengthwise, it is visible in Cross section. Lenth wise neutral layer is vissible

[@TheEngineeringHub]

The neutral axis is both lengthwise and widthwise if the bending is unidirectional. The NA is essentially a plane.

[@rajshekar-nm3fh]

@@TheEngineeringHub sorry, NA lies in CS. It is intersection of neutral plane with CS and also it the axis in CS about which BM is considered.

[@rajshekar-nm3fh]

Also, since you told NA is a plane! How an axis can be a plane? Plane is 2 dimensional and axis is. One dimensional

[@TheEngineeringHub]

@@rajshekar-nm3fh the NA is the location of the beam where the stress is equal to zero. Each cross-section along the length of the beam has an NA. If you connect all the NAs of each single section of the beam you get a plane.

[@rajshekar-nm3fh]

That is why, I told, Neutral plane is length wise and NA is in CS

[@utilityzc2039]

Why will there be no 'sliding' of 'layers' with respect to each other in pure bending?

[@MuhammadQasim-th3ed]

Please sir upload full course of Mechanics of materials ...

[@ayushchoubey635]

👍

[@prince_thakur0004]

WTF. Never heard bending monent is a 2 force concept. Maybe 2nd force is the reaction to the force applied perpendicular to face. And torque is a special case of shear force. Unlike shear force, which is parallel to cross section amd perpendicular to face, torque is applied inclined to the face

[@tomaszniemy6066]

Never heard about a couple? It's a basic concept. Get better books or ask Google.

[@jackmehoff2363]

TORQUE IS WHAT MAKES MY TIRES BREAK LOOSE IN MY CORVETTE, 1 of 600, ENOUGH HORSES IN THAT CAR TO GIVE THE FRAME A BENDING MOMENT, KNOW WHAT I MEAN HOSS?

[@fern8580]

📌your attempt at explanation is valuable, costly in time, but it is a failure, you lose a lot of people. The best explanation is based on the example of "a sponge". Congratulations on your attempt.

[@TheEngineeringHub]

The foam beam explanation is great but also already available online. I went for an alternative way, and I guess I failed.

[@ThiagoCururu1]

@@TheEngineeringHub Well, you did not fail for all viewers. Thanks for a nice video!

[@TheEngineeringHub]

That means the world to me, thanks Thiago!

[@HotTacticalBoyfriendOfficial]

I'm not sure why you feel the need to be so patronising, nor why you think a 5 minute briefing is "costly in time". Speaking as a steel erector (not an engineer), I though their explanation was rather good: both accessible and adequate.

[@TheEngineeringHub]

@Jim-kc2ol thanks Jim 🙏 glad you found it useful

[@brudweger]

Intuitively?😂

[@TheEngineeringHub]

I guess it wasn't so intuitive

[@jeffyjames6192]

​@@TheEngineeringHubcan you make an another video on how the bending moment formula is derived for uniform bending of the beam, and some more reasoning on bending moment And a video on how to read those graphs which you have given in this video