A high impact speed generates oblong machining tracks due
to sliding impacts, as observed by Barletta and Tagliaferri (2006),
Barletta et al. (2007a,b) and Yabuki and Matsumura (1999). Oblong
machining tracks are evident in Fig. 16. The machining tracks are
rather long and occasionally characterized by deep scratches with
adjacent ridges.