PSI - Issue 28

Najat Zekriti et al. / Procedia Structural Integrity 28 (2020) 1745–1754 Najat Zekriti and al/ Structural Integrity Procedia 00 (2019) 000–000

1753

9

For the different loading conditions, the stress intensity factor obtained from the crack surface displacements using the DIC method and the empirical formula is compared in Fig.10.

Fig.10. SIF using crack surface displacements of the DIC method versus an empirical solution.

The DIC method based on the Ncorr code gives results for the stress intensity factor that are in accordance with the results found by empirical solutions. 4. Conclusion In this work, an experimental study is executed to estimate the mechanical parameters. Here, both extruded and printed specimens are studied. Tensile testing had been performed based on ASTM standard, mechanical properties of each sample, the ductility and fracture toughness had been extracted and compared, the fracture behavior has been established to resume that each constituent had propagate in the same way. In the other hand, we deduce that DIC method based on Ncorr code is a high-powered and cost-effective technique for accessing to full field kinematic measurements. The displacement has been measured, the crack tip has been located and the SIFs has been determined with good accuracy. These encouraging results will allow us to define the evolution of the crack propagation rate as a function of the stress intensity factor of polymers for different geometries and loads. References Ab Ghani,a, M. B. Ali,b, S. DharMalingam, and J. Mahmud, Digital Image Correlation (DIC) Technique in Measuring Strain Using Berfield, T. A., J. K. Patel, R. G. Shimmin, P. V. Braun, J. Lambros, and N. R. Sottos. Micro-and nanoscale deformation measurement of surface and internal planes via digital image correlation. Experimental Mechanics 47, no. 1 (2007): 51-62, (1996) Berthaud, Y. et al., 1995. edts., Photomécanique, (GAMAC, 1995). Blaber, J., B. Adair, and A. Antoniou. Ncorr: open-source 2D digital image correlation matlab software. Experimental Mechanics 55, no. 6 (2015): 1105-1122. Chu TC, Ranson WF, Sutton MA, Peters WH, 1985. Applications of digital-image-correlation techniques to experimental mechanics. Exp Mech 253:232–244 doi:10.1007/BF02325092. Grédiac M. & F. Hild, 2011. edts., Hermes, Paris (France). Helm JD, McNeill SR, Sutton MA Improved three dimensional image correlation for surface displacement measurement. Soc Photo Opt Instrum Eng 35(7):1911–1920]