TY - JOUR

T1 - Transient abrasion on a rubber sample due to highly dynamic contact conditions

AU - Runge, Stephan

AU - Ignatyev, Pavel A.

AU - Wangenheim, Matthias

AU - Bederna, Christoph

AU - Wies, Burkhard

AU - Wallaschek, Jörg

N1 - Funding Information: For a combined evaluation of force and displacement signals we utilize the high-speed image software mentioned above. Fig. 9 presents snap shots from video analysis. Raw video frames are presented on the top row. Results of image processing with identified positions of RSC and SH are shown in the bottom rows. For better visibility the sample was colored gray. The markers were set automatically to the points RSC and SH. Because the sample's corners do not lose contact we assume pure shear. It can be observed, how the sample gets into contact (0 ms), starts to be compressed (2 ms) and becomes deflected due to deformation slip (8 ms). A stronger shear for the sample B can already be observed visually a short time before the snap-out (8 ms). Positions of the RSC, plotted in Fig. 10 for both compounds, support this observation. With a shear of up to approx. 0.67 mm sample B's pre-tension is 30% stronger than for the stiffer sample A with only 0.49 mm. Therefore, sample B has to pass a longer sliding distance during snap-out from 8 to 10 ms. Fig. 11 depicts the tracing of point SH, showing a greater compression of sample B as well.

PY - 2021/7/18

Y1 - 2021/7/18

N2 - Abrasive processes, primarily the local slip, are the dominant contributor to friction and wear of vehicle tires in service. The time history of forces accompanying acceleration, braking, and cornering in particular, lead constantly to changing contact conditions under the tire. Consequently, a laboratory test taking into account not only surface texture but also tire contact times (in the range of milliseconds) as well as realistic contact forces in a freely controllable temporal sequence is desirable. This paper presents the study of the dynamic contact between a rubber block and the abrasive surface at conditions close to those in a tire footprint. In our case, the test samples are a miniaturized tread block allowing to reproduce the intermittent tire contact including correct contact timings, pressure and friction coefficients in dependence on the driving maneuver to be tested. An analysis and comparison of friction and wear mechanisms for continuous contact and defined contact times is presented surpassing the characterization capabilities of DIN abrasion testers. Two different compounds with a variation of stiffness are examined. The grip and wear rates are analyzed and compared. It is shown that understanding the dominant mechanisms and quantifying tire tread friction and wear in detail require the consideration of realistic transient dynamics of a tire tread block impacting the road at each revolution of the tire.

AB - Abrasive processes, primarily the local slip, are the dominant contributor to friction and wear of vehicle tires in service. The time history of forces accompanying acceleration, braking, and cornering in particular, lead constantly to changing contact conditions under the tire. Consequently, a laboratory test taking into account not only surface texture but also tire contact times (in the range of milliseconds) as well as realistic contact forces in a freely controllable temporal sequence is desirable. This paper presents the study of the dynamic contact between a rubber block and the abrasive surface at conditions close to those in a tire footprint. In our case, the test samples are a miniaturized tread block allowing to reproduce the intermittent tire contact including correct contact timings, pressure and friction coefficients in dependence on the driving maneuver to be tested. An analysis and comparison of friction and wear mechanisms for continuous contact and defined contact times is presented surpassing the characterization capabilities of DIN abrasion testers. Two different compounds with a variation of stiffness are examined. The grip and wear rates are analyzed and compared. It is shown that understanding the dominant mechanisms and quantifying tire tread friction and wear in detail require the consideration of realistic transient dynamics of a tire tread block impacting the road at each revolution of the tire.

KW - Pin on disc

KW - Sliding friction

KW - Tire wear

KW - Transient contact mechanics

KW - Wear testing

UR - http://www.scopus.com/inward/record.url?scp=85104134424&partnerID=8YFLogxK

U2 - 10.1016/j.wear.2021.203848

DO - 10.1016/j.wear.2021.203848

M3 - Article

VL - 477

JO - Wear

JF - Wear

SN - 0043-1648

M1 - 203848

ER -