PSI - Issue 3

M.P. Falaschetti et al. / Procedia Structural Integrity 3 (2017) 237–245 Author name / Structural Integrity Procedia 00 (2017) 000–000

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This depth could be referred as an interlaminar interface and, therefore, the damage is more evident than at a different depth (e.g. 0.2 mm as shown in Figure 4a).

Fig. 5. Full Scan impacted specimen (from the left D1, C1, B5, E5) (a) at 0.2 mm and (b) at 0.55 mm depth

2.4. Compression After Impact tests CAI tests were performed by means of a CLC test fixture, described in Falaschetti et al. (2015), Wegner et al. (2000), Scafé et al. (2013) & (2014). Tests were performed at room temperature and humidity, using 70 and 500 kN MTS electro-hydraulic testing machines, equipped respectively with MTS 100 and 500 kN load cells. All experimental tests were conducted in displacement control with a constant rate of 1.3 mm/min and data were acquired at 10 sample/s rate. Residual compressive strength was calculated considering specimen cross section and ultimate load (Table 3-7). Due to not satisfactory failure mode, some specimens test results were not taken into account; therefore, due to their unreliability, those data are not presented.

࣌ ࢓ࢇ࢞ [MPa] 435.14

Table 3. Compression results for non-impacted specimens Specimen Cross sectional area [mm 2 ]

Maximum load [N]

A1 A2 A3 A4

162.5 168.5 164.7 164.5

70708 81107 80815 76958

481.34 490.66 467.71 468.71

ߪ

௠௘௔௡ [MPa] Sd. Dev [MPa]

24.29

CV [%]

5

࣌ ࢓ࢇ࢞ [MPa] 437.08

Table 4. Compression results for 5J near-edge impacted specimens Specimen Cross sectional area [mm 2 ]

Maximum load [N]

B1 B2 B3 B4 B5

168.0 168.9 168.8 166.0 168.7

73429 71656 75856 78094 75753

424.14 449.43 470.49 449.16

ߪ

௠௘௔௡ [MPa] Sd. Dev [MPa]

446.06

17.17

CV [%]

4