PSI - Issue 17

Pedro J. Sousa et al. / Procedia Structural Integrity 17 (2019) 812–821 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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Besides the shape , it is necessary to obtain material properties for the blades’ material, as it is not known which type of thermoplastic it is made of. For this simulation, it was necessary t o obtain three parameters: Young’s modulus, Poisson ratio and density. T he first parameter, Young’s modulus, was obtained using an Instron E1000 test instrument, where the blade was secured to a support using clamps and a 3 mm displacement was imposed to its tip, at the location defined in Figure X. The measured force was approximately 3.29 N. Using these values as the input for a Finite Element Method, a Young’s Modulus of approximately 1 003 MPa is obtained.

Fig. 4. Location of the applied load for Young's Modulus measurement

The next parameter, the Poisson ratio, was also obtained experimentally. This time using 2D Digital Image Correlation and applying traction to a small rectangular portion of a blade, as shown in Fig. 5. The resulting ratio between transversal and longitudinal strains gives us a Poisson ratio of approximately 0.4001 in average.

Fig. 5. Specimen used for Poisson ratio measurement

Fig. 6. Poisson ratio measurement results using 2D DIC