Definition of criteria for adhesive failure in lubricants

The exclusive use of friction coefficient curves is no longer sufficient for differentiated tribological characterization of lubricants. The reason? Increasingly complex lubricant formulations and the performance of modern drive and control concepts in tribometer construction. Instead, use the criteria compiled by a standards working group as a sound evaluation basis for defining adhesive failure of lubricants. As an SRV® user, you additionally benefit from our analytics processing stages, which permits decisive conclusions for research and development. > Learn more

The ASTM D 5706, ASTM D 7421 and ISO 19291 standards are the basis for generating the test data presented here. Algorithm-based evaluation mechanisms are applied to the recorded primary and secondary result quantities.

Options

  • You can use the criteria gained as part of standardization work to define adhesive failure as a sound evaluation assistance.
  • This provides practical, reproducible information on the time of failure of your lubricant or tribosystem.
  • You can differentiate between different adhesive effects such as welding and material transfer.
  • You can use the analysis capabilities of our automated TriboProfiling® evaluation methodology for in-depth functional analysis of your tribosystem.
  • You can predict the energy efficiency of a tribocontact by correlating friction energy and/or friction power with the pass load.
  • You can investigate the energy balance of the tribosystem and its dissipation of friction energy into thermal energy or other energy forms.

Your benefits

  • Using the device immediately results in valid criteria for characterizing the performance of your tribosystem.
  • Many secondary result quantities are additionally available to verify the identified failure time.

Ill. Electrical resistance curve (brown) during a load increase test. After each increase of the normal force (violet levels), a short break in electrical resistance can be seen. At the time of the adhesive failure, the electrical resistance permanently collapses.

Ill. Correlation of friction energy and average friction power with the achieved pass load at a test temperature of 80°C