PSI - Issue 33

7

Jesús Toribio et al. / Procedia Structural Integrity 33 (2021) 1131–1138 Jesús Toribio / Porcedia Structural Integrity 00 (2021) 000–000

1137

 (x)

 (x)

NOTCH

NOTCH

X MVC

X MVC

X C = X MVC / 2

X C = X MVC

(i)

(ii)

 (x)

 (x)

NOTCH

NOTCH

X MVC X CL X CL

X MVC X CL

X C = X MVC + X CL

X C = X MVC + X CL /2

(iii)

(iv)

Fig. 4. Different process zone approaches: (i) border of the MVC region, (ii) middle of the MVC region, (iii) boundary between the first and the second cleavage facets after the MVC region, (iv) middle of the first cleavage facet after the MVC region

The average size of the cleavage facets in the steel (75 μm), represents the basic fracture unit when it is typically brittle (Park and Bernstein, 1979; Lewandowski and Thompson, 1986). This fracture unit can be considered as the