13th International Conference on Fracture June 16–21, 2013, Beijing, China constitutive relation of the material. The step-by-step removal of critical lattice elements indicates the microcracks evolution in the specimen. Thus the microcracks propagation and the cracks pattern in the final failure state can also be simulated. Figure 4. Uniaxial tensile test setup For the example given in this paper, the resulting stress-strain response is presented in Figure 5, and some mechanical properties can be computed as given in Table 2. 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 0 0.002 0.004 0.006 0.008 0.01 0.012 0.014 Stress (MPa) Strain Figure 5. Simulated stress-strain response of the 40 mm concrete specimen Table 2. Simulated mechanical properties of the 40 mm concrete specimen Young's modulus (GPa) Tensile strength (MPa) Strain at peak load Fracture energy (J/m2) 31 1.8 0.04% 127 The pattern of the simulated stress-strain response of the 40 mm concrete specimen is similar to the one observed in laboratory, and the mechanical properties computed from the stress-strain diagram are also located within the reasonable range. -5-
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