Second, the tensile fracture transitioned from a predominately ductile, microvoid coalescence to a brittle cleavage fracture
. Brittle fracture was also observed in the baseline +Ni heat but only in association with porosity, and the pore size was generally smaller in comparison to the baseline chemistry.
A fracture of normalized Brinar 500, even after testing at +20[degrees]C, is a typical cleavage fracture
(Figures 25(b) and 27(b)) with characteristic system of "rivers" that combine in "drainage areas" towards expansion direction of the main crack.
At the same time, at T = -60[degrees]C, the profile of shear lips takes on the form typical of cleavage fracture
, and the lips become "degenerated" (Figure 3(i)).
This type of fracture is considered to correspond the mechanical cleavage fracture
, suggested by the Film Induced Cracking (FIC).
The surface of the crystal displayed fine striations along its length, and an incipient cleavage fracture
was present in the same orientation.
It could also be seen granular and cleavage fracture
in the fracture surface.
In the morphology of fracture, impact and cleavage fracture
surfaces are rough, the failure surfaces are more, energy consumption is larger, and the appearance of ductile failure indicates the achievement of the purpose of toughening.
9 are reminiscent of the river patterns observed in the cleavage fracture
The mechanisms that initiate the fracture are shear fracture, cleavage fracture
, and intergranular fracture.
Effect of glue-line flexibility on cleavage fracture
toughness of wood-epoxy resin bond system.
The first approach we tried to interpret the changes in fracture mode with ligament length was the critical stress model for cleavage fracture
, since it was previously suggested in a similar case (12).