What is Shear force and Bending Moment?
Channel: MechanicaLEi
Date: 2018-06-14

Welcome back MechanicalEI, did you know that unlike normal forces and moments which occur on the outside, shear force and bending moment occur on the inside of a beam? This makes us wonder, what is Shear force and Bending Moment? Before we jump in check out the previous part of this series to learn about what Volumetric Strain is? First, let's grasp the concept of an axial force which acts along the centroidal axis of the member. If the axial force acts through the centroid of the member it is called concentric loading. If the force is not acting through the centroid it's called eccentric loading. Shearing forces are unaligned forces pushing one part of a body in one specific direction, and another part of the body in the opposite direction. When the forces are aligned into each other, they are called compression forces. An example is a deck of cards being pushed one way on the top, and the other at the bottom, causing the cards to slide. A bending moment is the reaction induced in a structural element when an external force or moment is applied to the element causing the element to bend. The most common or simplest structural element subjected to bending moments is the beam. For equilibrium, the moment created by external forces (and external moments) must be balanced by the couple induced by the internal loads. The resultant internal couple is called the bending moment. Hence, we first saw what axial force is, then saw what shear force is and finally went on to see what Bending moment is?
In the next episode of MechanicalEI find out what are beams with internal hinges?

Attributions:

Doh De Oh by Kevin MacLeod is licensed under a Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/)
Source: http://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100255
Artist: http://incompetech.com/

Subtle Library by Fabian Measures (http://freemusicarchive.org/music/Fabian_Measures/) is licensed under a Creative Commons Attribution licence ( https://creativecommons.org/licenses/by/4.0/)
Source: http://freemusicarchive.org/music/Fabian_Measures/Emotion_Music/Subtle_Library