Processes of dynamics of surface layers during low-amplitude fretting

Abstract

Abstract-A model of dynamic effect during low amplitude oscillations of surfaces comparable with the pre liminary displacement and the first acts of sleep under the oscillating tangential loading of the contact is developed. Solving a system of differential force balance equations has yielded the main characteristics of the process of the dynamics of a nominally stationary contact depending on the governing parameters of the sys tem. Regularities of the friction characteristic at low sliding velocity are determined with allowance for the preliminary displacement phenomenon, the Stribeck effect, as well as the parameter of the plasticity and vis cosity of friction. The model allows one tracing the evolution of relative displacements and slip velocities, cal culating phase diagrams, as well as deriving the friction characteristic and real slip amplitudes typical of the mixed friction mode and low amplitude fretting.

Laser beam profiling: experimental study of its influence on single-track formation by selective laser melting

“…The system Article published by EDP Sciences allows collecting of enough data for diagnosis of negative effects and also an explanation of some processes [11]. Now there is no melting process control system at industrial machines [12]. The quality of 3D objects' production by SLM is controlled approximately, just by watching it during processing.…”

Technical Problems and Perspectives of Implementing the Selective Laser Melting Method for Producing Structural Components for Aircraft

“…The American Society for Testing and Materials (ASTM International Committee F42) jointly with the Technical Committee (ISO/TC 261) have prepared a list of generally-accepted standards related to additive manufacturing. These include the standards of the following technical committees: ASTM F42, ISO/TC 261, SASAM, BSI, CEN/STAIR-AM, UNM 920 [2][3][4].…”