PSI - Issue 41

6

Mikhail Bannikov et al. / Procedia Structural Integrity 41 (2022) 518–526 Author name / Structural Integrity Procedia 00 (2019) 000–000

523

To analyze the spatial distribution of strain fields based on the digital image correlation method [11], the Strain Master measuring system was used, which allows "in-situ" recording of the field from targets on the sample surface under conditions of uniaxial quasi-static and cyclic loading, followed by recalculation into strain fields at different times with a time step 0.1 s For the obtained distributions of strain field fluctuations, an algorithm was used to determine the most fluctuating point. Fig. 5 illustrates the deformation fields at the time moments of 117.4-117.7 seconds with the most fluctuating point highlighted (black cross). According to the frames, it can be seen that at the moment from 117.5 to 117.6 seconds, the sample was destroyed in the capture area. It should be noted that acoustic emission sensors were glued to the sample just below the grips, as a result of which no deformation fields were obtained in these places.

(a)

(b)

(c)

(d)

Fig. 5 - (a) Distributions of deformation fields at time points 117.4-117.7 seconds (a)-(d), respectively. The most fluctuating point is marked with a black cross. The abscissa and ordinate axes show spatial coordinates in pixels