Mechanical modeling of scratch induced periodic damage
Conference Paper
Overview
Overview
abstract
Regardless of the polymer type, periodic occurrence of scratch-induced damage features is commonly observed. The above phenomenon is believed to be the result of a "stick-slip" process during scratch. The stick-slip process is caused by the presence of a horizontal degree of freedom of the tip and the oscillation between the static and kinetic frictional behaviors. In addition, the tip geometry and material pile-up ahead of the scratch tip will further complicate the scratch tip movement during scratch. To understand this complex phenomenon, a simplified analytical model on the stick-slip phenomenon is proposed to account for the observed periodic scratch-induced damage features on polymer surfaces. Through the above modeling effort, fundamental understanding of the scratch behavior under various scratch conditions is gained. Implication of the above study for fundamental understanding of the mechanical nature of the ASTM/ISO scratch test is also discussed.
