PSI - Issue 18

Giuseppe Pitarresi et al. / Procedia Structural Integrity 18 (2019) 330–346 Author name / Structural Integrity Procedia 00 (2019) 000–000

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formulation. To account for the machine grip effect in the numerical model, displacements were applied on the grip section (dotted lines in Figure 1).

(a)

10 12 14 16 18

non-linear fracture process zone

SIF dominated

non-linear far-field zone

zone

0 2 4 6 8

slopes of linear regression lines are proportional to SIF

-5

0

5

10

15

20

25

2 [MPa 2 ]

1/( T max )

Fig. 2. (a) Experimental Stanley-Chan linear regression data plot (example taken from the SENT sample tested at R =0.1 and load frequency of 15 Hz); (b) definition of the data input area used in the LSF.

Fig. 3. Thermoelastic signal (a,b,c) and thermoelastic phase (d,e,f) maps acquired with load ratios R of 0.1 (a,d), 0 (b,e) and -1 (c,f). The white dot in (a,b,c) indicates the crack-tip location as measured by the optical camera. The data shown come from tests at load frequency of 15 Hz.