scholarly journals Effect of loading time on the static friction polymer-metal sliding pairs at low temperature

2018 ◽  
Keyword(s):  
Low Temperature ◽  
Static Friction ◽  
Polymer Metal ◽  
Friction Polymer

INFLUENCE OF THE DYNAMICS OF FORCED MOTION ON THE STATIC FRICTION IN METAL-POLYMER SLIDING PAIRS

Tribologia ◽  
2021 ◽  
Vol 295 (1) ◽  
pp. 21-26
Author(s):  
Mariusz Opałka ◽  
Wojciech Wieleba ◽  
Angelika Radzińska
Keyword(s):  
Relative Motion ◽  
Friction Pair ◽  
Polymeric Materials ◽  
Static Friction ◽  
Metallic Materials ◽  
Test Results ◽  
Friction Resistance ◽  
Rate Of Increase ◽  
Polymer Metal ◽  
Metal Polymer

The resistance during the frictional interaction of polymeric materials with metallic materials is characterized by a significant dependence on the dynamics of the motion inputs. In a metal-polymer friction pair, the static friction resistance during standstill under load depends on the rate of growth of the force causing the relative motion. Tribological tests of selected (polymer-metal) sliding pairs were carried out. The selected polymers were polyurethane (TPU), polysulfone (PSU), and silicone rubber (SI). They interacted with a pin made of normalized C45 steel under unitary pressure p = 0.5 MPa in dry friction conditions at different gradients of the force driving the relative motion (dF/dt = 0.1-20 [N/s]). The static friction coefficient of the selected sliding pairs was determined on the basis of the recorded static friction force values. The test results show a significant influence of the rate of increase in the motion driving force on the values of static friction resistance. This is mainly due to the viscoelastic properties of polymers.

THE INFLUENCE OF A CONSTANT STATE OF DEFORMATION ON THE FRICTION COEFFICIENT IN SELECTED THERMOPLASTICS (POLYMER–STEEL PAIR)

Tribologia ◽  
2017 ◽  
pp. 39-45 ◽  
Author(s):  
Maciej KUJAWA ◽  
Wojciech WIELEBA
Keyword(s):  
Room Temperature ◽  
Tensile Deformation ◽  
Small Deformation ◽  
Static Friction ◽  
Kinetic Friction ◽  
High Deformation ◽  
Polymer Properties ◽  
The Coefficient Of Friction ◽  
Constant State ◽  
Friction Polymer

The effect of tensile deformation on polymer structures and their mechanical properties is described in various papers. However, the majority of articles are focused on high deformation (a few hundred percentiles) at increased temperature. It causes changes in orientation and the crystallinity ratio. The authors of this paper asses the influence of strain (max. 50%) on hardness and the coefficient of friction (polymer–steel A1 couple) for selected polymers. The deformation was conducted at room temperature and maintained during tests. There was a significant reduction (up to 50%) of hardness after deformation, in the case of all examined polymers. In the case of PE-HD, the coefficient of kinetic friction almost doubled its value (89% increase). The reduction of the coefficient of static friction for sliding pairs that include PTFE and PA6 was about 26% (in comparison with non-deformed polymer). For all investigated polymers, hardness increased over time (up to 40% after 24 hours). Coefficients of static and kinetic friction decreased in 24 hours (up to 29% coefficient of static friction and 19% coefficient of kinetic friction). The research shows that a small deformation causes changes in polymer properties. Moreover, these changes appear at room temperature directly after deformation.

Parylene C-on-photoresist (POP): a low temperature spacer scheme for polymer/metal nanowire fabrication

2011 ◽  
Vol 21 (6) ◽  
pp. 067001 ◽  
Author(s):  
Yuanhui Li ◽  
Quan Xie ◽  
Wei Wang ◽  
Mingxin Zheng ◽  
Hao Zhang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Parylene C ◽  
Polymer Metal ◽  
Metal Nanowire

Low-temperature static friction of N2monolayers on Pb(111)

2007 ◽  
Vol 19 (30) ◽  
pp. 305013 ◽  
Author(s):  
G Fois ◽  
L Bruschi ◽  
L d’Apolito ◽  
G Mistura ◽  
B Torre ◽  
...  
Keyword(s):  
Low Temperature ◽  
Static Friction

STATIC FRICTION OF REVERSE STEEL–ELASTOMER SLIDING PAIRS

Tribologia ◽  
2018 ◽  
Vol 279 (3) ◽  
pp. 147-151
Author(s):  
Wojciech WIELEBA ◽  
Mariusz OPAŁKA
Keyword(s):  
Friction Coefficient ◽  
Friction Force ◽  
Polymeric Materials ◽  
Static Friction ◽  
Steel Sample ◽  
Thermoplastic Elastomers ◽  
Wear Process ◽  
Polymer Metal ◽  
Deformation Component ◽  
Deformation Area

Sliding cooperation of materials with different hardness (deformability), e.g., a polymeric material cooperating with metallic materials, occurs in machine elements in one of the following two variants: a conventional pair or a reverse pair. In the case of the conventional sliding pair, the deformation area (contact area) of the sliding materials does not move on the surface of the polymer element during their cooperation. In the case of reverse pairs, the contact surface changes its position when moving on the surface of the polymer element. Depending on the variant of the sliding pair, the differences in the friction and wear process of polymer material can be observed. Tribological investigations of chosen sliding pairs (elastomer on steel or steel on elastomer) in the static friction were carried out on the rig. The polymeric materials selected for the tests were thermoplastic elastomers TPU, PUR, and silicone rubber SI. These materials co-operated with C45 steel in the different contact pressures (p = 0.1 – 0.26 MPa) under dry friction or mixed lubrication conditions (hydraulic oil Hipol HLP-68). Based on the recorded value of the friction force Ft, the values of static coefficients of friction μstat were determined. The test results showed a significant influence of the variant of the combination of materials (metal-polymer or polymer-metal) on the value of the friction coefficient. In all tested pairs in which steel sample (pin) slid against elastomeric plates, the friction coefficient was higher than in the case when the elastomeric sample (pins) cooperated with steel counterfaces (plates). The main reason is the considerable value of the deformation component of the friction force. This is probably due to the displacement of the elastomer deformation area in its surface layer and energy dissipation as a result of stress-strain hysteresis in the elastomeric material, as in the case with reversed pairs.

Polymer-Metal Composite Thin Film Microcap Packaging Technology Using Low Temperature SU-8 Bonding

2016 ◽  
Vol 16 (11) ◽  
pp. 11613-11618 ◽  
Author(s):  
Jinnil Choi ◽  
Yong-Kook Kim ◽  
Soo-Won Kim ◽  
Byung Hyun Nam ◽  
Byeong-Kwon Ju
Keyword(s):  
Thin Film ◽  
Low Temperature ◽  
Composite Thin Film ◽  
Metal Composite ◽  
Packaging Technology ◽  
Polymer Metal
Sign in / Sign up

Export Citation Format

Share Document