PSI - Issue 28

A. Chiocca et al. / Procedia Structural Integrity 28 (2020) 2157–2167

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A. Chiocca et al. / Structural Integrity Procedia 00 (2020) 000–000

9

δ = 20 mm

δ = 10 mm

δ = 15 mm

δ = 5 mm

10 − 3

2 . 5 ·

2

1 Relaxed radial strain ε Rrr (-) 1 . 5

0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 0 . 5

θ ( ◦ )

10 − 4

5 ·

4

1 Relaxed radial strain ε Rrr (-) 2 3

0

0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360

θ ( ◦ )

Fig. 8. Relaxed radial strain over specimen hoop coordinate for di ff erent cutting depths and a fixed strain gauge radial distance of r ext = 6 . 5 mm. The mean value are represented as dashed lines for each depth of pass δ

5. Conclusions

From the research carried out and from the results obtained it can be concluded that:

• the incremental hole drilling process allows obtaining an extensive number of measurements for every strain gauge employed through parameters variation such as hole diameter and depth;