Advances in Composite Tribology by Klaus Friedrich (Eds.)

By Klaus Friedrich (Eds.)

A lot study has been conducted, and many development has been made in the direction of using composite fabrics in a variety of tribological purposes. in recent times, experiences were made to figure out to what measure phenomena governing the tribological functionality of composites should be generalized, and to consolidate interdisciplinary details for polymer-, steel- and ceramic matrix composites. the significance of marketing larger wisdom within the components of friction, lubrication and put on, generally, is validated via the contents of the amount. It covers quite a lot of matters extending from primary examine at the tribological features of varied multi-phase fabrics as much as ultimate purposes of composites in put on loaded, technical elements. as well as the emphasis on composites tribology, the sensible point of the sector can be reviewed via authors who're engaged in utilized learn in addition to these in additional educational actions. The articles during this quantity could be of worth to either researchers and mechanical designers of their paintings in the direction of a suite of predictive, fabrics engineering-related versions for a extra trustworthy use of composites as tribo-materials. during the examine and remark of the tribology of sensibly formulated composite structures, a transparent and extra profound knowing of the topic of tribology may possibly emerge. during this experience, this article deals a serious review of the nation of knowing of the rules of tribology and its skill to serve the sensible and advertisement wishes of this know-how often, and especially within the context of composite structures

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E. that the wear factor is inversely proportional to the compression modulus, is also observed with LCP (table 11). 4. 1. Self-reinforced PE-HD. In order to investigate the effects of orientation on the tribological properties, the specimens were tested in three sliding direc­ tions. The results are shown in fig. 25. There is no big difference between the TABLE n Compression moduli and tribological properties of LCP (type 3). 5 m / s , p = 3 N / m m , T = 23°C, s-direction. 42 6 3 2 Highly oriented Weakly oriented * With standard deviation.

Results of the measurement of retardation on PE-HD The average retardation of a self-reinforced and a normal PE-HD specimen is compared in fig. 17. PE-HD is self-reinforced by oriented crystalline structures (shish-kebab struc­ tures) and it is highly crystalline. Therefore, the orientation of the crystalline structures can approximately be found by means of measurement of retardation, 5A J/g 0 130° C a 310°C V^TypI 132,1°C^- ^ -- temperature [°C] Fig. 16. D S C curves of semicrystalline (type 2) and amorphous (type 1, table 5) LCP.

41). T A B L E 18 Comparison of different ways for improvement of tribological properties. Method Efficient application Positive effects Negative effects Lubricant fillers adhesive materials lower friction, possibly wear worsening of mechanical proper­ ties, possibly wear resistance Reinforcing fillers low wear resistent materials lower wear, possibly friction anisotropy, possibly higher adhesion Self-reinforcement low wear resistent, self-reinforceable materials lower wear, slight reduction of friction anisotropy possible /.

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