Modelling the Crack Initiation and Propagation of Notched Rock Beam under the Three-Point Bending Load

Figure 6

The crack processes and maximum principal stress under the loading displacement: (a) 0.018 mm; (b) 0.036 mm; (c) 0.073 mm; (d) 0.38 mm.

(a)

(b)

(c)

(d)