Issue 48

S. Bressan et alii, Frattura ed Integrità Strutturale, 48 (2019) 18-25; DOI: 10.3221/IGF-ESIS.48.03 21 Figure 3 : Observation surface Figure 4 : Microstructure of horizontal (a) and vertical (b) specimens S TRESS - STRAIN CYCLIC CURVES he stress-strain cyclic curves of the material have been obtained by performing a step-up test for both proportional and non-proportional strain paths. The proportional strain is represented by a push-pull (PP) test, while the non-proportional loading is represented by a circle loading path (CI) (Fig. 5). Figure 5 : Applied strain paths. T Push-pull (PP)  3  Circle (CI)