Coefficient of Friction (µ) Friction is the natural resistance to the sliding motion of one surface over another Static Coefficient of Friction (µ. s) = Fx/Fy. Fx = Force to initiate motion. Fy = Normal force holding surfaces together Dynamic Coefficient of Friction (µ. k) = Fx/Fy. Fx = Force to sustain motion. Fy = Normal force holding surfaces together
Coefficient of Friction New Method, New Requirements - Introducing the DCOF AcuTest SM 1 A tribometer is an instrument that measures parameters in the field of tribology such as frictional forces, coefficient of friction, and the effects of lubrication.
Pressure- Force per surface area where the force is normal to the surface: measured in pascals. Friction- The force that acts to oppose motion between 2 materials in contact. Static Friction- The resistance force that must be overcome to start an object in motion.
Friction is the resistance to relative motion between two surfaces. The lower the coefficient of friction is, the easier it is for the two surfaces to slide over each other. Friction causes wear and tear, which reduces the lifetime of a material.
Wear Factor and Coefficient of Friction Data To capitalize on the benefits of thermoplastic compounds, it is helpful to understand the basics of wear and friction. Most engineers who are concerned with friction and wear performance compare the tribological parameters to judge the suitability of a …
Friction Stamylan ® UH has a low coefficient of friction and self-lubrication properties that render it very suitable as a sliding material. Most other polymer materials (e.g. PA6, PA66 or POM) have a higher dynamic coefficient of friction than Stamylan ® UH.
Dynamic friction (or kinetic friction) is the force needed to maintain motion between two surfaces. Static friction is the force needed to create movement between two surfaces. The coefficient of friction is a critical property of all materials which run on high speed manufacturing lines; particularly those in the printing and packaging industry.
The friction and wear of monolithic polyamide 66 (PA66) and a PA66 composite reinforced with short glass fibers were examined using a block-on-ring friction tester with particular focus on the effect of weight average molar mass (M w) of PA66. The amount of glass fibers in the composite and the molecular weight strongly affected the friction level and wear rate because it altered the shear strength and adhesion of PA66.
The tribological behaviors of PA66, HDPE, and their composites sliding against metals have been reported in earlier papers.7–10. It was found that PA66 has a superior wear resistance compared with other polymers, and its friction coefﬁcient is affected greatly by nor- mal load, sliding speed, and temperature.
Standard polymers have a thermal resistance below <100°C and less suitable for sliding / rolling surfaces. Examples of these polymers are: HDPE - High Density Poly Ethilene; ABS; PMMA; PVC; Most high performance polymers (compounds) are reinforced by fibres or/and filled with internal anti friction …