Question

Which stress is calculated in pure bending of beams?

Answer 1

1 Beams: A beam is defined as a rod or bar. Circular or rectangular of uniform cross section whose length is very much greater than its other dimensions, such as breadth and thickness. It is commonly used in the construction of bridges to support roofs of the buildings etc. Since the length of the beam is much greater than its other dimensions the shearing stresses are very small.
Assumptions:
While studying about the bending of beams, the following assumptions have to be made.
1. The length of the beam should be large compared to other dimensions.
2. The load(forces) applied should be large compared to the weight of the beam
3. The cross section of the beam remains constant and hence the geometrical moment of inertia ig also remains constant
4. The shearing stresses are negligible
5. The curvature of the beam is very small