PSI - Issue 6

A. Martemyanov et al. / Procedia Structural Integrity 6 (2017) 336–343

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A. Martemyanov et al. / StructuralIntegrity Procedia 00 (2017) 000 – 000

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Fig. 1. Dynamic tensile tests data.

Figure 1 show that 3-point approach gives increased values with respect to other methods.There is no individual characterization for every sample but generally Laurentian granite describes by 0.64% porosity, 92 GPa Young modulus and 0.21 value of Poisson ratio. Brazilian disc experiments interpretation based on incubation time criterion proposes next values as material characterization:  = 40 ±5 μs, σ st = 12.8 MPa. Analogical calculation for Flexural test case gives  = 50.5±10 μs, σ st = 26.2 MPa (Figure 2). Obtained results are consistent with recently received by Smirnov et al. (2017) data.

Fig. 2. Incubation time criterion interpretation of BD and FT data

Finally dynamic properties of united set were computed which demonstrates on figure 3. But first it was required to establish static tensile strength in spall case because of lack of this information in publication. Incubation time for all Laurentian granite studies rough value is 38±20 μs under assumption that σ st = 11 MPa for spall test data.