PSI - Issue 25

Dalbir Singh et al. / Procedia Structural Integrity 25 (2020) 159–171 Dalbir singh/ Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 14. Impact strength with exposure duration

Some additional tests were performed to obtain the results of oil solution absorption by the specimens. The sample were dried in hot air woven at 50 0 C for 4hr and weighed. The weight gain was obtained for the three oil solutions and was tabulated as shown in Table 4. It is possible to observe a small tendency to gain weight in terms of Avgas 100LL, ATF-K50 and Ox-38 aviation grade Fluids. In these cases, compared with the dry samples, an increase about 1.89% can be found after 45 days of exposure. The Influence of the aviation graded solutions and their exposure time on the weight gain is given in table 4.

Table 4. Effect of the solutions and exposure time on the weight gain Oil Solution Exposure Time ( no. of Days ) Weight Gain (%)

Standard Deviation ( %)

Avgas 100LL

15 30 45 15 30 45 15 30 45

0.07 0.14 0.21

0.085 0.081 0.13

ATF-K50

2.13 2.68 2.97

0.12 0.15 0.16 0.13 0.16 0.19

Ox-38

2.56 2.89 3.46