13th International Conference on Fracture June 16–21, 2013, Beijing, China -3- samples, and 1= d denotes that the correlation length is equal to the element length. It is shown that as the correlation length d increases, the points over the range d are more likely correlated. Figure 1. Scanning electron microscope image of a fibrous material structure [12]. Figure 2. Geometry of the truss lattice model. 3. Lattice parameter calibration The basic idea in setting up the elastic lattice models is based on the equivalence of strain energy stored in a unit cell (the bold-black part in Figure 4), of a volume V of a lattice with its continuum counterpart (the bold-red part in Figure 4), under uniform strain [9]
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