Abstract
For a long service time, fatigue has been a typical problem that mechanical sealing materials face. How does it relate to tribological performance? In this study, filled and unfilled thermoplastic polyurethanes (TPUs) were investigated. Dumbbell and faint wait pure shear (FWPS) specimens were used to characterize the fatigue properties and crack growth rate of TPUs, respectively. Additionally, to identify the impact of temperature on fatigue tests, the tests were conducted at room temperature and 80 °C. Different tribological tests were conducted to investigate their tribological properties. Fracture surfaces from fatigue tests and worn surfaces from tribological tests were analyzed using a scanning electron microscope (SEM). Two wear models were verified to correlate between fatigue and tribological properties; one of the models is better for rough counter surfaces, while the other is advantageous if the counter surface is smooth.
Highlights
Thermoplastic polyurethane (TPU) is an elastomer that is fully thermoplastic
Two wear models were verified to correlate between fatigue and tribological properties; one of the models is better for rough counter surfaces, while the other is advantageous if the counter surface is smooth
For TPU_A, it seems that its contact temperature reaches a balance at this stage
Summary
Thermoplastic polyurethane (TPU) is an elastomer that is fully thermoplastic. Due to these unique properties, TPU compensates for the material gap between rubbers and plastics. Researched the friction and dry sliding wear of short glass fiber (SGF) reinforced TPU He found that the coefficient of friction decreases with increasing SGF content in TPU, and 40 wt% of SGF in TPU shows the best tribological performance for a bearing application. With 20 phr of mica, the best reinforcement effect was achieved regarding tensile strength, whereas a high amount of aluminum trihydrate provides good flame resistance, but causes a pronounced decrease in tensile strength, Lubricants 2019, 7, 60; doi:10.3390/lubricants7070060 www.mdpi.com/journal/lubricants. Few researchers have addressed the effect of fillers on fatigue or tribological properties in TPU. The influence of the load was determined by load ramp tests and the influence of counterpart roughness by different ground steel discs Both fracture surfaces of fatigue tests and worn surfaces from tribological tests were analyzed with scanning electron microscopy (SEM)
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