# Moment applied causing bending stress in beam

• fonseh
In summary, the conversation discusses the concept of bending stresses and shear stresses in a beam. It is explained that when a moment is applied, it causes tension in the top part and compression in the lower part of the beam. This is due to the bending stresses perpendicular to the plane of the cut and shear stresses parallel to the plane of the cut. The tendency of slippage between fibers is caused by longitudinal shearing stresses.
fonseh

## Homework Statement

From the solution , it's clear that the top part of the beam undergo tension , while the lower part undergo compression .

## The Attempt at a Solution

But , i don't understand why it is so . When the moment is applied in the horizontal axis , the structure will slide become like this , right ? ( the top part will be slided into the book )
I can't imagine how the moment applied causing the top part to experience tension , while the lower part experience compression . [/B]

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You should have learned by now that moments cause bending stresses perpendicular to the plane of the cut, whereas shear stresses act parallel to the plane of the cut. The bending stresses cause stretching of the tension fibers or squeezing of the compression fibers. Tendency of Slippage between fibers is due to longitudinal shearing stresses.

## 1. What is a moment applied to a beam?

A moment applied to a beam is a force that causes the beam to rotate around a fixed point, resulting in bending stress on the beam.

## 2. How is the moment applied to a beam calculated?

The moment applied to a beam is calculated by multiplying the applied force by the distance from the fixed point to the force, also known as the lever arm.

## 3. What is bending stress in a beam?

Bending stress in a beam is the internal stress that occurs when a beam is subjected to a moment, causing it to bend or deform.

## 4. How does bending stress affect the strength of a beam?

Bending stress can significantly weaken a beam and lead to failure if it exceeds the beam's yield strength. The maximum bending stress that a beam can withstand is also known as its bending stress capacity.

## 5. What factors can affect the bending stress in a beam?

The bending stress in a beam can be affected by several factors, including the magnitude and location of the applied force, the beam's cross-sectional area, and its material properties such as yield strength and modulus of elasticity.

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