13th International Conference on Fracture June 16–21, 2013, Beijing, China -4- s-1. Specimens tested at negative potentials showed necking, and surface cracks perpendicular to the stress direction, and cracks oriented at 45 ° to the stress direction (Fig. 3(c)). The surface cracks were concentrated at the fracture site, and the number density of cracks decreased as a function of distance from the fracture surface. The surfaces of specimens tested at negative potentials were essentially similar. Fig. 3 shows that the surface cracks increased in size with increasingly negative potential. Figure 3. The surface appearances of specimens tested at negative potentials at 0.02 MPa s-1. (a) -950 mVAg/AgCl; (b) -1550 mVAg/AgCl; (c) magnified view of (b) in the necked region. Tensile direction is vertical 3.3. Cross sections through fracture surface (specimen S1550.02) Figure 4. The profile of a section through specimen S1550.02 tested in acidified 0.1 M Na2SO4, pH 2 at -1550 mVAg/AgCl at an applied stress rate of 0.02 MPa s -1. (a) overview; (b) detailed view in the center; (c) detailed view near fracture surface. The tensile loading was in the vertical direction. (a) (b) (c) (a) (c) (b)
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