# Stress in shafts

Designation of stress in various types of shafts. Considered shafts are under work of external forces which are placed in various point at shaft’s length. As a result of external forces, bending torques and torsion torques appear and cause mechanical stress inside shaft. To calculate mechanical stress inside shafts the following things will be done:
• designation of equilibrium equations
• calculation of shear force
• designation of bending torque
• designation of torsion torque
• designation of maximum stress

## Designation of stress in shaft – example 1

Shaft is fixed on both ends. On one end shaft can’t move. On second end shaft can move in one direction. On shaft are mounted two different circular plates. Every circular plate is described by its radius. External forces work on specific points of plates. Subject of example is to designate equilibrium equations. Next step is to plot characteristics of shear force, bending torque and torsion torque at whole shaft’s length. As final result the minimum diameter of shaft that provides enough strength it’s calculated.

## Designation of stress in shaft – example 2

Shaft is fixed on both ends. On one end shaft can’t move. On second end shaft can move in one direction. On shaft are mounted three circular plates. Two circular plates are the same. Every circular plate is described by its radius. External forces work on specific points of plates. Subject of example is to designate equilibrium equations. Next step is to plot characteristics of bending torque and torsion torque at whole shaft’s length. As final result the minimum diameter of shaft that provides enough strength it’s calculated.