PSI - Issue 3

Luciana Restuccia et al. / Procedia Structural Integrity 3 (2017) 253–260 Author name / Structural Integrity Procedia 00 (2017) 000–000

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where: n is the re-loading cycle index (in our case, n = 1); Pn is the peak load of the re-loading test; Pp is the peak load reached during the first loading stage; Pu is the residual load of unloading preceding the re-loading stage. Below, the Load vs. CMOD curves for both specimens (SH-GS-1 and SH-PC-2) resulting from first loading (Figure 7) and re-loading stages (Figure 8).

0 100 200 300 400 500 600 700 800 900 1000

SH-PC-2 SH-GS-1

Load [N]

0

0.05

0.1

0.15

0.2

0.25

CMOD [mm]

Fig.7. Load vs CMOD curve for SH-GS-1 and SH-PC-2, first load stage.

0 10 20 30 40 50 60 70 80 90 100

SH-PC-2 SH-GS-1

Load [N]

0

0.2

0.4

0.6

0.8

1

CMOD [mm]

Fig.8. Load vs CMOD curve for SH-GS-1 and SH-PC-2, re-load stage.

The data obtained from the Load-CMOD curves hallowed to calculate the values of the Load Recovery Index LRI for each sample: