PSI - Issue 18

Alexandru Falk et al. / Procedia Structural Integrity 18 (2019) 214–222 Falk A./ Structural Integrity Procedia 00 (2019) 000–000

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2.3. DIC measurements The correlation system used is Dantec Q-400, Fig.9. Cameras within the correlation system Q-400 are set to resolution of 5 megapixels. The system can be applied for objects of various sizes through simple adjustment of the optical lens. The illumination system, which is a part of this set, provides especially strong homogeneous light that ensures excellent measurement conditions.

Fig. 10 System adjustment and calibration

On PCB was applied a random speckle pattern and has been fixed in test device. After that cameras were adjusted, and the system was calibrated, Fig 10. . Correlation and analysis of the captured images was made with Istra 4D. Maximum principal strain distribution on PCB surface can be shown on Fig.11 and result of strain distribution in the area of stain gauges in Fig 12.

Fig.11. Strain distribution on PCB.