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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Table 3. Mechanical properties of tested materials at 10-3 s-1 Material Specimen geometry Yield Strength (MPa)

Young´s modulus (GPa)

Tensile strength (MPa)

Strain at rupture (%)

ASTM Standard

304

68

460

20

Al 2024-T3 ALCLAD

non-standard

290

68

456

21

ASTM Standard

393 380

71 71

455 452

9

Al 2124-T851

non-standard

10

100 150 200 250 300 350 400 450 500

2024-T3 ALCLAD Al Standard 2024-T3 ALCLAD Al non-standard 2124-T851 Al Standard 2124-T851 Al non-standard

Eng. Stress (MPa)

0 50

0

0,05

0,1

0,15

0,2

0,25

Eng. Strain (mm/mm)

Fig. 10. The overall comparison in between materials and geometries

4. Conclusion Mechanical properties of 2024-T3 ALCLAD and 2124-T851 aluminium alloys were determined using 2D and 3D DIC techniques. Specimen geometries were modified in a way to be compatible with dynamic testing machines, such as Split Hopkinson Tension Bar (SHTB). The results from comparing DIC and traditional strain measurement method (clip-on extensometer) demonstrated the validity of test setup and post processing during image correlation for standard specimens. Thereafter, relying only on 2D and 3D DIC techniques, geometric effect of the specimens were assessed. In general, acquired strength and stiffness values on standard and non-standard specimen geometries were in good agreement for both materials. Also, the measured strain values have been found to agree, as expected. Acknowledgements Dr. Moreira acknowledges POPH – QREN-Tipologia 4.2 – Promotion of scientific employment funded by the ESF and MCTES. Authors gratefully acknowledge the funding of Project NORTE-01-0145-FEDER-000022 - SciTech - Science and Technology for Competitive and Sustainable Industries, cofinanced by Programa Operacional Regional do Norte (NORTE2020), through Fundo Europeu de Desenvolvimento Regional (FEDER). The authors also acknowledge the CleanSky2 project DeMAnD - Dynamic aircraft MAterial property Database, funded under: H2020 EU.3.4.5.6. - ITD Systems.