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Prüfung der Nassrutschfestigkeit und Analyse der Gleitgeräusche
von Xiao-Dong Pan, Paul Zakelj, Cara Adams, Akiko Neil, Greg Chaplin
The British pendulum skid tester (BPST) has been widely adopted for laboratory characterisation of wet skid resistance (WSR) for rubber compounds. Testing results, however, are not yet well explained with material properties. SBR compounds filled with inorganic oxides have a higher wet skid resistance on a Portland cement concrete surface wetted with water than those having the inorganic oxides substituted by the same filler volume fraction carbon black.
Such a difference in WSR is eliminated under ethanol lubrication. When compounds filled with a reinforcing filler and compounds filled with a non‑reinforcing filler are compared with each other under ethanol lubrication the difference is retained. The possible modification of bulk viscoelasticity from ethanol absorption should not be neglected for consideration of these phenomena. When the loss tangent for the compounds is measured at various low temperatures, accepting that a dynamic deformation of rubber during testing with the BPST occurs in the frequency range 103‑106 Hz, it fails to correlate with WSR detected under water lubrication.
Since viscoelastic properties of rubber compounds and lubrication significantly affect sliding noise, it was captured under varied lubrication conditions during testing with the BPST. However, no strict correlation between the intensity of sliding noise and WSR was observed. From frequency domain analysis, major components of the sliding noise lie in the frequency range 500 – 5,000 Hz for most compounds. For better understanding the testing with the BPST, modes of material deformation during dynamic sliding on a wet rough surface need to be further scrutinized.