## Hertzian Contact Stress

Unusually high stresses may occur when a load is applied over a small area of contact. This phenomenon typically arises on a microscopic scale when a force is transmitted through two bodies in contact. Practical examples include contact of a wheel and a rail, valve...

## Equations of Motion – Linear, Circular and Projectile

To be able to describe the motion of a body in mathematical terms, we must first understand the type of motion it is undergoing. The equation(s) of motion to be used will vary depending on the situation under consideration. 1. Linear motion There are three general...

## Stress Transformations

The stress in a body is defined as the force acting per unit area. In practice, due to the presence of multiple forces and the body geometry, stress values vary throughout the body and may lead to areas of stress concentrations. But we will show that even on a single...

## Stress Concentration (Stress Riser)

In real world designs, parts are rarely simple in geometry and this may lead to areas of stress concentrations. They are also sometimes known as stress risers and can occur whenever there are abrupt changes in geometry or due to the presence of cracks in a material....