Crack Paths 2012

a)

b)

Figure 12. a) Real fractured surface

b) Digitalised fractured surface

a)

b)

c)

d)

Figure 13. a) Comparison of kinking angle with criterion by Richard

b) Comparison of kinking angle with criterion by Pook

c) Comparison of twisting angle with criterion by Richard

d) Comparison of twisting angle with criterion by Pook

With a CAD-software the data from the optical 3D-scanner further were processed

and an approximation area near the initial crack front was defined in order to determine

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