PSI - Issue 5

Sahand Pourhassan et al. / Procedia Structural Integrity 5 (2017) 1355–1362 Sahand Pourhassan et al./ Structural Integrity Procedia 00 (2017) 000 – 000

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of testing environment and number of utilized spot lights, aperture and exposure time were adjusted accordingly. Image acquisition period was set to 500ms for approximate test duration of 230 and 270 for standard and non-standard specimens. Using VIC snap software from correlated solutions, area of interest in mounted specimen was adjusted and brought into sharp focus. Fig. 4 and Fig. 5 illustrates the MTS 8servo hydraulic testing system with 100KN load cell equipped with 2D and 3D DIC system.

Fig. 4. MTS 810 servo hydraulic testing machine with 2D-DIC setup (a) Standard flat specimen (b) non-standard flat specimen

Fig. 5. MTS 810 servo hydraulic testing system with 3D-DIC setup (a) standard round specimen (b) non-standard specimen geometry

Table 2. Details for acquired images for correlation Material Specimen geometry

Pixel size (px/mm)

Facet size (px)

Total no. of acquired images (approx.)

ASTM Standard

31.5

21

460

Al 2024-T3 ALCLAD

Non-standard

27.8

29

570

ASTM Standard

- -

33 35

175 220

Al 2124-T851

Non-standard

3. Results Post processing the results was performed by VIC-2D and VIC-3D software from correlated solutions. Strain distribution on gauge length prior to rupture are illustrated for both materials.