BY: Noman Nazir Channa
Shakeel Ahmed Sahito
Introduction To Tribology
History Of Tribology
Importance Of Tribology
Tribology is derived from the Greek word “Tribos”. Means Rubbing.
Tribology is a science that deals with friction, lubrication and wear in all
Friction is a force that is created whenever two surfaces move or try to move
across each other.
Friction always opposes the motion or attempted motion of one surface
across another surface.
It’s the removal of material from a
solid surface by the action of
Lubrication helps in reducing friction.
Some Common Examples:
The wear generally occurs due to
excessive contact stress.
Having the knowledge about
stresses can helps in reducing
Cams are used to transmit rotary
motion in reciprocating motion.
Here wear is occurred on the cam
These components are subjected to
jerks in sliding distance, which leads to
form some pits(large hole) on the cam
Creation of pits on cam surface
increases noise pollution and reduces
Understanding the mechanism of wear
formation helps to estimate the life of
History Of Tribology
Historically, Leonardo da Vinci (1452–1519) was the first to say two laws
of friction (it was this connection that gave the name to the Leonardo Centre for
Tribology, one of the UK's leading research centers on the subject).
According to da Vinci, the frictional resistance was the same for two different
objects of the same weight but making contacts over different widths and
He also observed that the force needed to overcome friction doubles when the
weight doubles. da Vinci's findings remained unpublished in his notebooks. Da
Vinci identified the laws of friction in a notebook in 1493 and continued his
studies of friction for 20 years.
Guillaume Amontons rediscovered the classic rules (1699).
They were further developed by Charles-Augustin de Coulomb (1785).
Charles Hatchett (1760–1820) carried out the first reliable test on frictional wear
using a simple reciprocating machine to evaluate wear on gold coins.
New Areas Of Tribology
Since the 1990s, new areas of tribology have emerged, including the Nano
tribology, bio tribology, and green tribology. These areas study the friction,
wear and lubrication at the nanoscale, in biomedical applications (e.g.,
human joint prosthetics, dental materials), and ecological aspects of friction,
lubrication and wear (tribology of clean energy sources, green
lubricants, biomimetic tribology).
Importance Of Tribology:
Would Life Be Possible Without Tribology ?????