Home / EG MECH ROOM / Design Engineering / Stress and its types

# Stress and its types

### STRESS

When some external system of forces or loads act on a body, the internal forces (equal and opposite) are set up at various sections of the body, which resist the external forces. This internal force per unit area at any section of the body is known as unit stress or simply a stress. It is denoted by a Greek letter sigma (σ). Mathematically,

Stress, σ = P/A
where,

P = Force or load acting on a body, and
A = Cross-sectional area of the body.

In S.I. units, the stress is usually expressed in Pascal (Pa) such that 1 Pa = 1 N/m2. In actual practice, we use bigger units of stress i.e. megapascal (MPa) and gigapascal (GPa), such that

1 MPa = 1 × 106 N/m2 = 1 N/mm2

and                              1 GPa = 1 × 109 N/m2 = 1 kN/mm2

Reference

A textbook of Machine Design by R.S.Khurmi and J.K.Gupta

I have recently passed my Bachelor of Engineering in Mechanical Branch. I have expertise in CAD system. Also, I am interested to make new things.

## Surface Coating Operation

Surface Coating Operation The various manufacturing processes such as casting, forging, machining, hot working, cold working …