PSI - Issue 6

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

341

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

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Table 1.Barre granite anisotropic parameters Orientation σ st, MPa

 , μs

AS, %

AI, %

ZY YZ ZX XZ YX XY

16.5 11.8 17.1

41.8

16.61

3.69

45

43.2

32.05

7.30

8.8

50

13

45.5 53.3

15.56

7.89

9.5

Fig. 5.Barre granite dynamic tensile strength dependence on sample orientation.

As follows from calculations have been done anisotropic behavior of given material is caused by static strength parameters and related with incubation time weakly. All obtained  - values are typical for granites. Brittle character of rock material destruction depends on microcracks arisen from previous loadings. Based on considered case one may conclude that inner damages influence on incubation time slightly.

3.3. Fangshan Marble dynamic tensile test.

With Brazilian Disc method has been made investigation of dynamic tensile properties of Fangshan Marble (Zhang and Zhao, 2013b). Incubation time criterion based analysis allowed to determine characteristic material parameters:  = 75±10 μs , σ st = 9.5 MPa. Theoretical curve imposed on experimental points shown on figure 6.

Fig. 6.Fangshan marble dynamic tensile strength approximation by incubation time criterion curve.