Tribology: Fretting/reciprocating sliding test equipment (MODE I)

Description:

For the laboratory simulations of fretting/reciprocating sliding wear behaviour of tribo-surfaces in contact, three fretting/reciprocating sliding wear test machines were designed and constructed. The basic geometry of the contact is ball-on-flat. A linear displacement between ball and flat, perpendicular to the contact, is induced by a sliding sample table. The normal force is kept constant during testing. The friction force is continuously measured and stored.
FRETTING I FRETTING II FRETTING III

First generation FRETTING test machine

  • Wear contact at ambient or elevated temperatures (500°C) and ambient humidity
  • Dead weight loading of ball/pin on flat
  • Friction force measured directly by force transducer
  • Motion of flat by stepper motor

Example:

Selflubricating plasma sprayed coatings for elevated temperatures

Improved fretting/sliding wear test

  • Wear contact at ambient temperature and variable humidity (climat chamber)
  • Spring loading of pin/ball on flat
  • Friction force measured directly by force transducer
  • XYZ-positioning
  • Frictionless motion of flat on air bearing (linear ac/dc motor)

Examples:

  • TiN coated tool steels for cutting tools
  • Electrical contact resistance and wear behaviour of connector materials

High temperature fretting/sliding wear test

  • Wear contact at ambient humidity and normal or elevated temperatures (oven : 850°C)
  • Linear actuator loading
  • Friction force measured directly by four force transducers in parallel
  • Frictionless motion of flat on air bearing (linear ac/dc motor)

Example:

  • TiN coated and ion implanted steels for cutting tools
  • Plasma sprayed selflubricating coatings

Technical details:
FRETTING I FRETTING II (under development)
FRETTING III

Normal Load:
0.5 to 10 N dead weight

Displacement:
50 - 1000 µm

Frequency range:
4 - 1 Hz

Environmental conditions:
Ambient humidity

Temperature control:
Cartridge heater
20 - 650 °C

Testsamples:
Flats

Counterbody:
Standard ball Ø = 10 mm

Normal Load:
0.5 to 20 N spring loading

Displacement:
20 - 5000 µm

Frequency range:
10 - 1 Hz

Environmental conditions:
Variable humidity (RH: 10 - 95 %)

Temperature control:
Ambient temperature

Testsamples:
Flats

Counterbody:
Standard ball Ø = 10 mm
Dependant on tasks, special holders can be designed

Normal Load:
0.5 to 10 N actuator loading

Displacement:
20 - 2000 µm

Frequency range:
10 - 1 Hz

Environmental conditions:
Ambient humidity

Temperature control:
Furnace with MOSILIT heating elements
20 - 850 °C

Testsamples:
Flats

Counterbody:
Standard pin r = 5 mm
Standard ball Ø = 10 mm
Dependant on tasks, special holders can be designed

 
Room:
FRETTING I: 01.26 FRETTING II: 01.26 FRETTING III: 01.26

 
More Technical information: Techinfo@mtm.kuleuven.be
 

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Last modified: January, the 18th, 2002