Figure 3. Tearing machine Zwick 1387 with reflection polariscope LF/Z-2

From

Application of PhotoStress Method in the Analysis of Stress Fields Around a Notch

Peter Frankovský, Pavol Zubko, Oskar Ostertag, Martin Šmida

American Journal of Mechanical Engineering. 2013, 1(7), 329-334 doi:10.12691/ajme-1-7-35