Ball on Flat Sliding Wear Test

 using the Micro-Tribometer mod. UMT with Linear Reciprocating Motion Drive

ASTM G 133-95 (reapproved 2002)

Standard test method for determining the sliding wear of ceramics, metals, and other wear-resistant materials using the linear reciprocating ball-on-flat geometry.

Summary of Test Method:

This test method utilizes a flat lower specimen and a ball-shaped upper specimen that slides against the flat specimen. These specimens move relative to one another in a linear, back and forth sliding motion, under a prescribed set of conditions. In this test method, the load is applied vertically downward through the ball specimen against the horizontally mounted flat specimen. The normal load, stroke length, frequency of oscillation, test temperature, lubricant, and test duration are selected from one of two procedures.

Test Parameters

UMT Hardware Configuration for Procedure A:

·         4” Mounting Block – PN M30C116

·         2” Mounting Block – PN M30C166

·         Model DFH-5 Dual Friction/Load Sensor

-          range 0.5 N to 50 N

·         Suspension with Linear Guide-AM30C110D-1

·         3/8” Ball Holder –AM30B310B

                  -    for sensors mod. DFH

·         3/8” Diameter Ball Specimen

·         Lower linear Reciprocating Motion Drive

Manually adjust for 10 mm travel.

 -  mod. RMH

·         Optional Additional Sensors

- mod. ECR-xx Electrical Contact Resistance

 - mod. TMR-150 Temperature Measurement & Recording

 - mod. RTD Temperature Sensor

UMT Software Test Setup for Procedure A:

UMT Options File:

Load the options file that contains settings for the Linear Reciprocating Motion drive and the 50 N force/load sensor.

Test Sequence:

The Test Sequence should consist of 2 sheets.

Sheet 1 is for settling time for the carriage to establish the initial normal load.

     Carriage - applies a 25 N Constant Force for a Duration of 10 sec.

     Spindle  – Velocity is 0 revs/min.

     Slider     – is idle.

Sheet 2 is a 16 min. 40 sec. period

     Carriage - applies a 25 N Constant Force for a Duration of 1000 seconds.

     Spindle   – Velocity is 300 revs/min, Move-Continuous,  and Direction- Clockwise

     Slider      – is idle.

Data Collection:

The following should be checked under DataFile:

    Fx – Friction Force

    Fz – Normal Force

    T   – Time

    Z1 – Carriage Position (Used to determine Wear Depth)

    Te input – Temperature (optional)

AE – Acoustic Emission (optional)

EC – Electrical Contact Resistance (optional)

UMT Hardware Configuration for Procedure B:

·         4” Mounting Block – PN M30C116

·         Model DFH-50 Dual Friction/Load Sensor

-          range 5.0 N to 500 N

·         Suspension with Linear Guide-AM30C110D-1

·         3/8” Ball Holder –AM30B310B

                  -    for sensors mod. DFH

·         3/8” Diameter Ball Specimen

·         Elevated Temperature Chamber for Reciprocating Drive

·         Lower linear Reciprocating Motion Drive

Manually adjust for 1” travel.

 -  mod. RHH

·         Optional Additional Sensors

- mod. ECR-xx Electrical Contact Resistance

-  mod. AE-5 Contact Acoustic Emission Detector

 - mod. TMR-150 Temperature Measurement & Recording

 - mod. RTD Temperature Sensor

UMT Software Test Setup for Procedure B:

UMT Options File:

Load the options file that contains settings for the Linear Reciprocating Motion drive and the 500N force/load sensor.

Test Sequence:

The Test Sequence should consist of 2 sheets.

Sheet 1 is for settling time for the carriage to establish the initial normal load.

     Carriage - applies a 200 N Constant Force for a Duration of 10 sec.

     Spindle  – Velocity is 0 revs/min.

     Slider     – is idle.

Sheet 2 is a 30 min. 20 sec. period

     Carriage - applies a 200 N Constant Force for a Duration of 1820 seconds.

     Spindle   – Velocity is 600 revs/min, Move-Continuous, and Direction- Clockwise

     Slider      – is idle.

Data Collection:

The following should be checked under DataFile:

    Fx – Friction Force

    Fz – Normal Force

    T   – Time

    Z1 – Carriage Position (Used to determine Wear Depth)

Te input – Temperature (optional)

EC – Electrical Contact Resistance (optional)

Report:

Use the Viewer program to plot test results.

Select the parameters to be displayed by checking  the appropriate box under Parameters on the Viewer screen.

For viewing COF plots of reciprocating tests check the Fz box, click on the Symmetry button, click on the Peak Detect button, and then check the COF box.