Figure 2. General example of an isocline and stress trajectory (isostatic line)

From

Characteristic Entities in PhotoStress Method

Peter Frankovský, František Trebuňa, Ján Kostka, František Šimčák, Oskar Ostertag, Władysław Papacz

American Journal of Mechanical Engineering. 2014, 2(7), 239-243 doi:10.12691/ajme-2-7-13