Issue 35

E. Dall’Asta et alii, Frattura ed Integrità Strutturale, 35 (2016) 161-171; DOI: 10.3221/IGF-ESIS.35.19 167 The elastic equilibrium solution of the plane problem is related to prescribed boundary conditions, with no traction and no body forces being applied. The displacements/strains solution is independent on the Young modulus E (while stresses clearly depends on E), but it does depend on the Poisson ratio  (a value of  = 0.45 is adopted, which is typical of plastic materials and it is consistent with the experimental measurements of transversal contraction). This holds true also for the geometrically non-linear analyses with finite strains. The distribution of Green-Lagrange local strain components along the direction of the major axis of ellipse as a function of the distance from the ellipse root is compared in Fig. 7 for FE analysis and in-house DIC method using the LSM algorithm. (a) (b) Figure 2: Asphalt mixture sample 1: results computed, in order of appearance, with LSM, SGM, NCORR. (a) Map of the displacement along X axis [mm]; (b) Map of the strain along X axis [-]. (a) (b) Figure 3: Asphalt mixture sample 2: results computed, in order of appearance, with LSM, SGM, NCORR. (a) Map of the displacement along X axis [mm]; (b) Map of the strain along X axis [-].