PSI - Issue 25

8

Dalbir Singh et. al. Structural Integrity Procedia 00 (2019) 000 – 000

Dalbir Singh et al. / Procedia Structural Integrity 25 (2020) 159–171

166

Table 1. Tensile strength with Std.dev.

Exposure Duration

Control Sample (MPa)

Avgas 100LL Sample (MPa )

ATF-K50 Sample (MPa)

OX-38 Sample (MPa )

15 Days

654.2±6.2

648.2±4.9

642.7±6.8

656.2±7.5

30 Days

649.5±8.4

641.6±6.8

637.6±5.6

45 Days

638.2±8.6

626.4±5.9

596.8±8.8

Fig. 9. Tensile strength with exposure duration

Fig. 10. Failure mechanisms after 45 days: (a) Control samples; (b) Samples exposed to Avgas 100LL; (c) Samples exposed to ATF K50(d) Samples exposed to OX 38 3.2. Flexural test The flexural strength of carbon fibre reinforced composites under the exposure of different aviation grade fluids and different exposure duration is shown in Fig.11. The control samples and samples exposed at Avgas 100LL, ATF K50 and OX-38 aviation grade fluids, considering different exposure durations, displayed a decrease in flexural strength