Predictive wear modelling of lubricated piston rings in a diesel engine

Looking into a laser textured piston ring-liner contact

“…One of the main experimental findings of the study is thus that for more than 5% of the stroke length the bearing's inlet is starved, despite the contact being fully flooded with oil. This explains numerous other studies, which have shown localised wear immediately before/after reversal in simulated [33] and actual [55,56] reciprocating piston liner contacts. …”

“…Starved lubrication conditions can then prevail for up to 5% of the stroke length, depending on the lubricant's viscosity (as the viscosity increases, starvation occur for a larger portion of the stroke). This cavitation-reversal-starvation process explains the numerous examples of high wear found close to reversal points in reciprocating contact [33,55,56]. Wear is also alleviated by the presences of surface texture, due to the mechanism in Figure 16 which acts to fill the cavitated region with oil to flood the contact following reversal.…”

Lubricated Friction and Wear Properties of P-B Bearing Flaky Graphite Cast Iron

“…to perform minimum friction and wear to meet increasing demands on reducing pollution and fuel costs [1][2][3][4][5]. Many of investigations were conducted under reciprocating sliding because of their applications.…”

Modelamento do desgaste por deslizamento em anéis de pistão de motores de combustão interna.

“…Não foram modelados os desgastes abrasivo nem corrosivo, que com certeza devem participar do processo. Essa simplificação é também admitida nos demais modelos recentes de desgaste de anéis (PRIEST et al, 1999;PINT & SCHOCK, 2000), considerando apenas a operação de motores em condições especiais de ensaio em dinamômetro.…”