13th International Conference on Fracture June 16–21, 2013, Beijing, China -5- ν= 0.4. a. Hollow spheres b. Solid with spherical cells Figure 7. 3D models of the foam RVE Imposing the periodic boundary conditions and a displacement on the top of the RVE the elastic properties (Young’s modulus and Poisson ratio) were determined. Figure 8 presents the results of the equivalent Mises strain. a. Hollow spheres b. Solid with spherical cells Figure 8. Equivalent Mises strains Figure 9 presents a comparison between experimental (compression and DIC) and numerical results of Young’s modulus (Fig. 9a) and Poisson’s ratio (Fig. 9b). A good agreement was obtained between experimental and numerical values for Poisson’s ratio and Young’s modulus for low density foams. For the higher density foam (301 kg/m3) a difference of 16% was obtained between compression and DIC values of Young’s modulus which could be explained on different methodologies used to record the specimen deformations. a. Young’s modulus b. Poisson’s ratio Figure 9. Comparison between experimental and numerical values of elastic properties of PUR foams
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