Dynamic tests on PTFE sliding layers under earthquake conditions

Two-Sample Quantile Tests Under General Conditions

PTFE degradation under heavy ion irradiation

Polytetrafluoroethylene (PTFE) shows an outstanding combination of chemical and physical properties such as excellent resistance to chemical reagents, thermal stability in a wide temperature range, high electric resistance, and low friction coefficient. However, PTFE is known to be extremely sensitive to high energy radiation undergoing scission of the main chain. As a result of the reduction o...

Mechanism of Friction and Wear in MoS2 and ZDDP/F-PTFE Greases under Spectrum Loading Conditions

Two different greases formulated using MoS2 and a combination of ZDDP and functionalized PTFE (F-PTFE) were examined under spectrum loading conditions where loads, frequency, and duration of the steps were treated as variables. Combination of ZDDP and F-PTFE were synergistic resulting in a significant reduction in the wear and friction under spectrum loading condition. Decreasing the time step ...

Plastic and Tribological Properties of Polytetrafluoroethylene (PTFE) under Conditions of High Pressure and Shear

We investigate experimentally the behavior of a thin sheet of polytetrafluoroethylene between a steel plate and a cylindrical steel indenter under combined action of high normal force and torsion. Under these actions, the polytetrafluoroethylene layer is partially squeezed out of the contact area. The thickness of the remaining layer is studied as function of the applied normal force, the torsi...

Wear behaviour of martensitic NiTi shape memory alloy under ball-on-disk sliding tests

Ball-on-disk sliding wear tests were conducted on martensitic NiTi shape memory alloy against an alumina counter ball. The wear features and coefficients of friction of the samples subjected to different loads and sliding cycles were investigated to reveal the degradation process of the NiTi surface. Three stages of degradation were identified, namely, a near-zero wear stage, a transition wear ...