PSI - Issue 17

Pedro J. Sousa et al. / Procedia Structural Integrity 17 (2019) 835–842 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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Y axis

Z axis

Fig. 6. Filtered phase map for region of interest inside the specimen (black is zero, white is 2π) .

X axis

Y axis

Z axis

Fig. 7. Unwrapped phase map for region of interest inside the specimen

The unwrapped phase maps are then converted to displacements using equations (1) to (3). Due to the presence of rigid rotation of the support structure, it was necessary to perform post-processing on the data. Using a similar method as the one employed in [17], as well as in [18] – [20], it was possible to calculate the best-fit rigid rotation that is as closer as possible to a plane. This step was performed considering exclusively the external region of interest, as that one is the reference for the current measurements. Afterwards, the calculated rotation was applied to both regions, having obtained the results shown in Fig. 8 and Fig. 9.

(a) Obtained displacements for the inner region of interest

(a) Obtained displacements for the outer region of interest

Fig. 8. Obtained displacements for the specimen, when loaded up to 40°C