Abstract
A correct assessment of the stress-strain state and the strength of composites requires both reliable material deformation models verified by the experimental results and correct failure criteria for the full realization of the material strength potential. It is difficult to assess the material strength due to the complexity of biaxial tests and non-obviousness of the obtained results, especially in the case of biaxial loading in the out-of-plane direction. The aim of this study is to compare simplified experimental methods for determining the interlaminar shear properties of composites under through-thickness compression. The combination of inter laminar shear and through-thickness compression stresses was varied in two ways: by changing the cut angle of cubic specimens and by loading V-notched specimens at different angles in a new device.
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