Issue 37

D. Angelova et alii, Frattura ed Integrità Strutturale, 37 (2016) 265-271; DOI: 10.3221/IGF-ESIS.37.35 269 a. b. Figure 3 : Energy-Stress Constructions-Spaces MNLQQ 1 M 1 N 1 L 1 , expressing mechanical behaviour of: a. - 30 mm plates/sheets; and b. - 40 mm plates/sheets. a . b. Figure 4 : Pyramidal Spaces STUT 1 S 1 P, presenting a basis for predicting mechanical behaviour of: a. - 30 mm plates/sheets; and b. - 40 mm plates/sheets. On the basis of Fig. 3, Energy-Stress-Elongation Construction-Space MVZQQ 1 M 1 V 1 Z 1 has been plotted and shown in Fig. 5. It includes elongation after fracture, plotted for all stresses of the broken line NL, which moves the line NL to its new position, the broken line VZ. The Construction-Space MVZQQ 1 M 1 V 1 Z 1 includes all energy, stress and elongation characteristics of the final product and can be used as an instrument for general evaluation of the applied rolling technology and for prediction of steel-sheet mechanical behaviour, including plasticity, under exploitation conditions [3, 4]. Transition from the Space MNLQQ 1 M 1 N 1 L 1 to the Space MVZQQ 1 M 1 V 1 Z 1 can be done through the plotted in Fig. 5, Stress-Elongation Area NVZL.