Abstract
The crack closure integral method (CCI-meth.) has proved to be a numerically highly effective procedure for the fracture analysis of various crack problems in plane elasticity. In this paper it is shown that the CCI-method can also be utilized for the fracture analysis of non-coplanar crack extension in a compact tension shear specimen (CTS-spec.) under mixed-mode loading. The investigation is focusing on the directions the new crack is taking when kinking off from the original crack plane and when further crack extension is taking place. The results obtained straight forwardly by the CCI-method or by other mixed-mode fracture criteria are being compared with crack paths obtained experimentally by mixed-mode fracture of CTS-specimens. Hereby the tendency of the kinked crack is confirmed to extend preferably in that direction, which will create predominant mode-I conditions at the actual crack tip.
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