Page 68 - Fundamental of Engineering Design
P. 68
Stress
◦ When the mechanical component is subjected to external force,
a resisting forces is set up within the component. The external
resisting forces per unit area of the component recognize as a
stress.
◦ In the physical sciences and engineering, the force per unit area
within materials that arises from external forces
◦ Stress is expressed as the quotient of a force divided by an area
σ=
P = load or force acting on the body
A = cross – sectional area of the body
Unit = N / m 2 68
