13th International Conference on Fracture June 16–21, 2013, Beijing, China -7- Figure 4. Scanning Electron Micrographs of the specimen surface - (a) ∆σ/2 = 49.6 MPa - 108 cycles; (b) ∆σ/2 = 54.7 MPa - 107 cycles and (c) at the same place after 108 cycles; (d) ∆σ/2 = 69.4 MPa - 106 cycles; (e) ∆σ/2 = 69.4 MPa - 107 cycles (f) zoom of (e) (a) (b) (c) (d) (e) (f)
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