Crack Paths 2009

А

20 μ m

B

20 μ m

C

20 μ m

D

20 μ m

E

20 μ m

F

20 μ m

Figure 3. Fractographic surfaces of samples from aluminium alloy АК6tested at R = -19 (a,

b,), R = -1 (c, d,) and R = 0,5 (e, f,); a, c, e - crack stable growth zone ls;

b, d, f - accelerated crack extension zone lr

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