Interlaminar Stresses:

The inplane loads applied to angle ply laminate develop the interlaminar stresses. This is because the bending-stretching coupling can give rise to transverse stresses in the interface. A schematic illustration of how axial tensile loading of angle ply laminates cause rotation of the plies is shown in Figure 6.5(b). This rotation of the plies generates the interlaminar shear stresses, which is one of the crucial factors in delamination. The interlaminar stresses are very pronounced in the region of free edges. The development of these stresses under axial extension is discussed in the following.