The Torsional Fatigue Behaviour of the In-Plane Shear Modulus of Composite Materials

Static torsion tests and fatigue torsion tests are carried out on quasi-isotropic carbon epoxy laminates consisting of 16 plies with different stacking sequences in order to determine the influence of the stacking sequence on the value of G12. Therefore, an automated torsion setup developed by COSARGUB, was used. The results are compared to those obtained with CLT (Classical Laminate Theory). Based on the conclusions in [2], the axial displacement was also monitored during the fatigue tests because this parameter seems to be more sensitive than the evolution of G12 in order to describe the torsional fatigue behaviour.