Crack Cordinate System
Material Coordibue System aligned
Material Coordinate System to Crack Cooninate System
Figure 3-3: Brazilian disk having center crack lying in {111} slip plane and aligned
along [12t] direction
Table 3-1: Geometrical and material properties of the two specimens analyzed
Rectangular Specimen 'A' (Fig. 3-4) Brazilian Disk B (Fig. 3-5)
E 106.2GPa H 20.32cm E 106.2GPa W 2.794cm
G 108.2GPa W 5.08cm G 108.2GPa t 0.254cm
v 0.4009 t 1.016cm v 0.4009 2a/W 0.2-0.8
F 4.448KN 2a/W 0.1-0.9 F 4.448KN
W -- Width or Diameter of the specimen,
H -- Height of the Specimen,
t -- Thickness of the specimen,
F -- Uniaxial load applied,
-- Angle of inclination between crack and load applied.
Fig. 3-3 on page 28 shows that the crack plane lies on (111) plane and is directed
along (121) direction. This slip system has been explained with the help of
octahedral slip planes.