ASTM D3702-94(2009)
Standard Test Method for Wear Rate and Coefficient of Friction of Materials in Self-Lubricated Rubbing Contact Using a Thrust Washer Testing Machine

Standard No.
ASTM D3702-94(2009)
Release Date
1994
Published By
American Society for Testing and Materials (ASTM)
Status
Replace By
ASTM D3702-94(2014)
Latest
ASTM D3702-94(2019)
Scope

This test method is used to determine the equilibrium rate of wear and coefficient of friction of materials in rubbing contact under useful operating conditions, that is, combinations of pressure and velocity that fall below the PV (pressure × velocity) limit of the test material. The user of this test method should determine to his own satisfaction whether the results of this test procedure correlate with field performance or other bench test machines. If the test conditions are changed, the wear rates may change and the relative value of one material with respect to another may also change.

Test conditions may be selected from Table 1.

The precision of wear measurement is relatively independent of test duration or amount of wear, but the precision of wear rate (calculation) improves with test duration and amount of wear. It is generally believed that useful wear rate precision requires the selection of a test duration sufficient to produce 0.1 mm (0.004 in.) of wear. Test durations will often be in the 50 to 4000-h range.

TABLE 1 Test ConditionsA

Rotational
speed, rpm		Rubbing Velocity,
ft/min (m/min)		Load, lb (kg), to Obtain PV, psi × ft/min (kg/cm 2 × m/min) at Selected Speeds
PV1 1250 (26.8)PV2 2500 (53.6)PV3 5000 (107.1)PV4 10 000 (214.3)
36 10 (3.05) 25.0 (11.3)50.0 (22.7) 100 (45.4)200 (90.7)
180 50 (15.2) 5.0 (2.3)10.0 (4.5) 20.0 (9.1) 40.0 (18.1)
900 250 (76.2)1.0 (0.5) 2.0 (0.9) 4.0 (1.8)8.0 (3.6)

A For many applications a wear rate exceeding 1.0 × 10− 5 in./h (2.5 × 10−7 m/h) is considered excessive. Typical wear rates for some commonly used materials at different PV levels are:

Acetal homopolymer at PV1: 5 × 10−6

ASTM D3702-94(2009) history

  • 2019 ASTM D3702-94(2019) Standard Test Method for Wear Rate and Coefficient of Friction of Materials in Self-Lubricated Rubbing Contact Using a Thrust Washer Testing Machine
  • 1994 ASTM D3702-94(2014) Standard Test Method for Wear Rate and Coefficient of Friction of Materials in Self-Lubricated Rubbing Contact Using a Thrust Washer Testing Machine
  • 1994 ASTM D3702-94(2009) Standard Test Method for Wear Rate and Coefficient of Friction of Materials in Self-Lubricated Rubbing Contact Using a Thrust Washer Testing Machine
  • 1994 ASTM D3702-94(2004) Standard Test Method for Wear Rate and Coefficient of Friction of Materials in Self-Lubricated Rubbing Contact Using a Thrust Washer Testing Machine
  • 1994 ASTM D3702-94(1999) Standard Test Method for Wear Rate and Coefficient of Friction of Materials in Self-Lubricated Rubbing Contact Using a Thrust Washer Testing Machine
Standard Test Method for Wear Rate and Coefficient of Friction of Materials in Self-Lubricated Rubbing Contact Using a Thrust Washer Testing Machine


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