PSI - Issue 8

Massimiliano Avalle et al. / Procedia Structural Integrity 8 (2018) 239–255 Author name / Structural Integrity Procedia 00 (2017) 000 – 000

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the tensile strength of the TPU. The only important exception is again with CNT that, even in small concentrations, largely affect the strength and maximum strain of the TPU compounds. All these observations do not clearly correlate with the morphological observation made by SEM: it seems that the peculiar properties of the additives alone, as for example the solid lubricant graphite and MoS ₂ , are the most influencing factors .

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

GR PTFE SIL MoS₂ CNT

Friction coefficient

0%

5%

1 0%

1 5%

2 0%

Additive content

Fig. 9. Effect of additives content on TPU compounds, coefficient of friction

5

GR PTFE SIL MoS₂

4

3

2

1

Volume loss (mm³) @ 2000 m

0

0%

5%

1 0%

1 5%

2 0%

Additive content

Fig. 10. Effect on wear of additives content on TPU compounds (CNT case not indicated as not measurable)