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This paper reports an experimental study on the mode II interlaminar fracture
of carbon/epoxy multidirectional (MD) laminates as well as on composite laminates with
specific stacking sequence exhibited mechanical couplings. The aim of the analysis was to
determine the mode II critical strain energy release rate (c-SERR, GIIC) and an applicability of
the data reduction schemes. Specimens were subjected to the end notched flexure (ENF) test.
During the experiment the applied load and the load point displacement were registered.
Additionally, the crack onset and all propagation values were observed and marked on the
specimens edges. Moreover, the acoustic emission (AE) data were registered. The values of
the mode II c-SERR were obtained with assumptions of the Direct Beam Theory (DBT) and
Corrected Beam Theory (CBT). The experiment proved that the fracture toughness depends on
the specimen delamination interface. For the asymmetric laminates, the mode II c-SERR
reached significantly greater values for those specimens where the bending-extension coupling
(BE) occurred.
