Results obtained from biaxial load tests on cruciform specimens with inclined through thickness cracks and inclined cracks emanating from a hole are presented. It is shown that predominant mode II loading drives the stable crack in the direction almost parallel to the fatigue pre-crack. High (steel StE550) or moderate (A12024-T3) mode I crack tip opening components causes a crack path deviation in the direction normal to the maximum tensile stress. The mixed mode crack resistance curves are presented in form of the magnitude of a crack tip displacement vector and compared with conventional R-curves of standard compact-tension (C(T)) and center-cracked-tension (M(T)) specimens. The effect of the load biaxiality is discussed with regard to previous experiments with mode I loaded cruciform specimens (1).
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