Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Time-dependent response of the effective friction coefficient, µeff, averaged over all specimens, in experiment E1, which compares the outcome of migrating versus stationary contact areas. All three testing configurations are shown. Standard deviations are reported in Table 2.
