Friction and wear mechanisms. (1987)

Wall paintings with scenes of the construction of pyramids in ancient Egypt.

A cartoon telling about the struggle with the friction of ancient man, about the use of the wheel in the transportation of various objects.

Cars on the streets.

Landing of the aircraft on the landing gear.

Volchek.

Wall clock with a pendulum.

Steamboat.

The concept of friction.

Portraits of scientists who have studied the processes of friction.

Experiments of scientist Charles Coulomb on the study of friction.

Formulas of friction force and coefficient of friction.

A cartoon explaining the concept of the coefficient of friction.

Alternating frames with scientists studying the nature of friction.

Scientific studies have shown that the perception of the load does not occur with the entire contact area, but only with individual sections, micro-dimensions.

A cartoon showing the touch process.

By the nature of the relative motion of the rubbing bodies, sliding friction is distinguished, as an example of the movement of bulky goods by the ancient Egyptians, rolling friction, as an example of an ancient steam locomotive.

Both types manifest themselves together when rolling is accompanied by slippage, for example, the slipping of a train wheel when the speed is set.

A device for transporting ready-made buns to packaging.

Lubrication of the part during its machining.

Examples characterize friction without lubrication and with an intermediate lubricant.

A cartoon explaining the nature of grease-free friction.

The role of lubrication in friction processes.

Cartoon explaining the role of boundary and liquid lubrication in the adhesion processes during surface friction.

Processes occurring when an object moves on a stationary substrate, in the presence of liquid lubricant.

The train goes by rail.

Rolling resistance is mainly due to the deformation of solids.

The ball rolls down the bowling alley.

A cartoon explaining the rolling resistance of objects.

Bearings.

Gear, friction and cam gears, couplings, guides.

With the help of these devices, they transmit motion and transform it from one kind to another.

Mechanical processing of parts by cutting is always accompanied by friction and wear processes.

In gears, rolling is accompanied by sliding.

A cartoon deciphering these processes.

Open-pit mining.

Various mechanisms work.

Where there is friction, wear is usually present.

It disables up to 90% of difficult-to-manufacture parts, friction units.

An employee checks the wheel pairs of the wagons for malfunctions.

Inspection of the car in the repair shop.

The main mechanisms of wear depend on the conditions in which friction occurs.

Repair of the combine.

The concept of abrasive wear.

Various components of earthmoving, agricultural, mining and mining equipment are subject to such wear.

The formula for the volume of worn material.

A cartoon explaining the phenomenon of abrasive action on solids.

Adhesive wear occurs as a result of the sequential formation and destruction of friction bonds resulting from the interatomic interaction of the contacting surfaces.

A cartoon explaining the process.

Adhesive wear occurs when there is friction without lubricants or when there is a shortage of it.

Samples of worn parts.

Adhesive wear formula.

Fatigue wear occurs in well-lubricated mechanisms whose surfaces operate under conditions of kinematic rolling, sliding or rolling with sliding.

A sample of such wear.

Fatigue wear is typical for most mobile interfaces.

Cyclically repeated contact stresses cause surface damage in the form of smallpox wear, pits and cracks.

A biplane takes off.

Erosive wear is damage to solids in the flow of various particles.

Marine pipelayer.

A cartoon explaining the processes occurring during erosive wear.

Alternating frames with devices that are subject to such wear.

Cavitation wear occurs during the relative movement of solids and liquids.

A cartoon showing the effect of cavitation wear on the ship's propeller.

A helicopter spraying fields with chemicals.

With small vibrational movements of surfaces in conditions of corrosive environment, wear occurs during fretting corrosion.

Samples of mechanisms subject to such corrosion.

Defects in such corrosion are rubs, breakouts, sinks.

Samples of deformed parts.

One of the most dangerous types of surface destruction during friction is wear under jamming conditions.

A scientist examines damaged parts under a microscope.

This process is often characterized by catastrophically rapid wear of conjugated pairs and can lead to a complete failure of the mechanism.

Alternating frames with scientists investigating friction processes.