ASTM G99-17

Wear Testing with a Pin-on-Disk Apparatus

International Tribology Standard

Perform wear testing with the pin-on-disk ASTM G99-17 method using the Multi Function Tribometer. This method is for wear testing metals, polymers, ceramics, composite materials, hard coatings, and much more.

Summary of the ASTM G99-17 Standard

This test method covers a laboratory procedure for determining the wear of materials during sliding using a pin-on-disk apparatus. Materials are tested in pairs under nominally non-abrasive conditions.

For the pin-on-disk wear test, two specimens are required. One, a pin or ball that is positioned perpendicular to the other, usually a flat circular disk. The test involves a stationary ball to wear against a rotating disk at a controlled force and speed.

During the test COF, friction force, wear etc. parameters are measured. The ball and disc wear volume is calculated from the ball and disc wear radius and width respectively.

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Wear Test Parameters

Load:	10 N
Speed and Velocity:	0.1 m/s
Environment:	Room Temperature (~23 °C) Humidity (12-78%)
Test Duration:	2.77 hours or 1,000 m of sliding distance
Data:	Friction Force (Fx) Normal Force (Fz) Rotary Velocity (T) Vertical Displacement (Z) Coefficient of Friction COF Acoustic Emission AE

Data Summary

The COF, down force, wear, acoustic emission is recorded and reported in real time. When two different materials are tested, it is recommended that each material be tested in both the pin and disk positions.

The data also shows 3D image of the wear mark on lower sample.

The table 1 shows data across various labs during inter-laboratory test on standard materials.

Test #	Average COF at A	Average COF at B	Average COF at C
1	0.66	0.65	0.59
2	0.61	0.64	0.51
3	0.63	0.65	0.60
4	0.66	0.61	0.62
5	0.61	0.65	0.61
6	0.63	0.64	0.60
7	0.62	0.60	0.64
8	0.61	0.62	0.52
9	0.63	0.65	0.59
10	0.64	0.66	0.64
Average	0.63	0.63	0.61

ASTM G99-17 pin-on-disk-wear test data summary

More on the Multi Function Tribometer Series Hardware

Load sensor (N)
Friction sensor (20 N)
The typical pin specimen is cylindrical or spherical in shape. Typical cylindrical or spherical pin specimen diameters range from 2 to 10 mm.
Universal ball holder
52100 steel ball – 6 mm
Stainless Steel Disk (2 inch)
Lower rotation drive
Optional additional sensors
Integrated 3D optical profilometer (for volume wear) on MFT-5000 and MFT-2000A platforms
Temperature in option
Humidity in option
Acoustic emission in option

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