Issue34

L. Marsavina et alii, Frattura ed Integrità Strutturale, 34 (2015) 387-396; DOI: 10.3221/IGF-ESIS.34.43 392 Figure 2 : Experimental set - up with details of ASCB specimen in three point bending grips (top right), respectively with SEC specimen in Arcan grips (left and middle right). Property Units of measure NECURON 100 160 301 Density kg/m 3 100.35±0.25* 145.53±0.22* 300.28±1.38* Mode I fracture toughness (ASCB) MPa · m 0.5 0.087 0.131 0.372 Mode II fracture toughness (ASCB) MPa · m 0.5 0.049 0.079 0.374 Mode I fracture toughness (SEC) MPa · m 0.5 0.088 0.108 0.337 Mode II fracture toughness (SEC) MPa · m 0.5 0.069 0.095 0.319 Table 6 : Material properties determined experimentally (* standard deviation values). 0 50 100 150 200 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Load [N] Displacement [mm] 2.66 4 6 8 12 30 ASCB Specimens 145 kg/m 3 density 0 50 100 150 200 250 300 350 0.0 0.5 1.0 1.5 2.0 2.5 Load [N] Displacement [mm] 300 145 100 300 145 100 Density [kg/m 3 ] a) b) Figure 3 : Typical load - displacement curves: a) Influence of applied mixed mode for ASCB specimens; b) Influence of density for SEC specimens loaded in Mode I.