Ply stacking sequences for laminated plates having in-plane and bending orthotropy

On Extension–Shearing coupled laminates

“…This is seen from the buckling interaction curves of Figs (4) and (5). Figure (4) represents the results for a series of simply supported square plates joined end-to-end to form a long plate, supported at regular transverse intervals by ribs to form square bays.…”

“…Bartholomew [5] performed the original work in establishing a definitive list of specially orthotropic laminate stacking sequences (A S B 0 D S ), from which the Engineering Sciences Data Unit (ESDU) has since published [6] particularly where ply terminations are necessary and specially orthotropic characteristics are a design requirement, and was the key motivation leading to the redevelopment of the definitive list for fully uncoupled, or specially orthotropic laminates with up to 21 plies [4], including the scope for laminate taper [7]. In the derivation of this revised list for standard ply configurations, e.g.…”

Anti-symmetric laminates for improved consolidation and reduced warp of tapered C-sections

“…The result is that there are many more fully uncoupled anti-symmetric laminates than there are symmetric ones. 7 Another major advantage of anti-symmetric laminates is that it is possible to drop a single^angle-ply pair and maintain a balanced, anti-symmetric laminate. This is the case since dropping a single positive angle ply requires dropping the corresponding negative angle ply on the other side of the mid-plane, which maintains balance and antisymmetry simultaneously.…”

Stacking Sequences for Extensionally Isotropic, Fully Isotropic and Quasi-Homogeneous Orthotropic Laminates

“…From these sequence listings, the form (and number) of the subset for fully uncoupled EIL stacking sequences with π/3 isotropy can be summarized as: AS (173), SS (10), + NN + (106), + NN − (208) and + NN = + NN (238), whilst the form (and number) of EIL stacking sequences with π/4 isotropy can be summarized as: AC (12), AS (72), SC (2), SS (6) and + NN = + NN (6). Angle-ply QHOLs containing a single cross-ply orientation, i.e.…”

“…The form (and number) of FOL stacking sequences contained in the definitive list 3 for up to 21 plies can be summarized as: AC (210), AN (14,532), AS (21,906), SC (12), SN (192), SS (1,029), + NS + (220), + NS − (296), + NN + (5,498), + NN − (15,188) and + NN = + NN (10,041). From these sequence listings, the form (and number) of the subset for fully uncoupled EIL stacking sequences with π/3 isotropy can be summarized as: AS (173), SS (10), + NN + (106), + NN − (208) and + NN = + NN (238), whilst the form (and number) of EIL stacking sequences with π/4 isotropy can be summarized as: AC (12), AS (72), SC (2), SS (6) and + NN = + NN (6).…”