System Dependence of Running-In Attractor Derived From Lubricated Sliding Contact of Steel Alloys 52100 and 1045

The steady-state described by running-in attractor in the perspective of nonlinearity, is closely dependent on the running-in parameters. To study the dependence of running-in attractor on system parameters, pin-on-disk friction tests were performed. A suitable contact between pin and disk was ensured by a self-adaptive pin holder, standard block, and self-adapting amendment with sandpaper. Range analysis of correlation dimension, predictability, and entropy shows that running-in attractor is system dependent, which is manifested by the dependence of nonlinear parameters of the attractor on the running-in parameters. Further results indicate that the correlation dimension and entropy increase with load and velocity, but decrease along with initial roughness of a harder counterface, and predictability shows an inverse variation tendency with correlation dimension and entropy.