Issue 29

M. Marino et alii, Frattura ed Integrità Strutturale, 29 (2014) 241-250; DOI: 10.3221/IGF-ESIS.29.21 248 0.428   0.571   0.714   0.857   1   0    0.445   0.556   0.667   0.778   0.889   1   45    0.428   0.571   0.714   0.857   1   90    Figure 5 : Progressive damage in the composite laminated plate for 0    , 45 ,  90  and for different values of / max u u   , where u is current pin displacement and max u is the pin displacement inducing the bearing failure. Moreover, D AA denotes the equivalent material stiffness of the laminate along the fiber direction. On the other hand, when the pin displacement occurs along the direction orthogonal to the fibers, the Rotem’s criterion predicts a damage onset at lower loads than the experiments, since the highest stresses arise in the transverse-to-fiber direction and are entirely associated to the transverse laminate strength ( / , T AT S S   ).