TY - GEN
T1 - Balanced and symmetric laminates - New perspectives on an old design rule
AU - York, Christopher B.
AU - Weaver, Paul M.
PY - 2010
Y1 - 2010
N2 - Stacking sequence listings are presented for bend-twist coupled laminates (A SB 0D F), with up to 21 plies. The study demonstrates that the common design rule of balanced and symmetric stacking sequences predominantly gives rise to bend-twist coupling; all exceptions are presented in AIAA-2007-2083. However, the symmetry rule is shown to be a constraint that serves only to restrict the number of possible configurations to a very small proportion of the total design space for this laminate designation. This is demonstrated through a definitive list of laminate configurations, which are characterized in terms of angle- and cross-ply sub-sequence symmetries. Each stacking sequence configuration is presented together with dimensionless parameters from which the extensional and bending stiffness terms are readily calculated. Expressions relating the dimensionless parameters to the well-known lamination parameters are also given, together with graphical representations of feasible domains for all sub-sequence symmetries containing standard ply angle combinations i.e. ±45, 0 and 90°. Quasi-isotropic (A IB 0D F) laminates are also presented as an important subset of A SB 0D F laminates. Finally, bounds on buckling performance under shear and compression are presented.
AB - Stacking sequence listings are presented for bend-twist coupled laminates (A SB 0D F), with up to 21 plies. The study demonstrates that the common design rule of balanced and symmetric stacking sequences predominantly gives rise to bend-twist coupling; all exceptions are presented in AIAA-2007-2083. However, the symmetry rule is shown to be a constraint that serves only to restrict the number of possible configurations to a very small proportion of the total design space for this laminate designation. This is demonstrated through a definitive list of laminate configurations, which are characterized in terms of angle- and cross-ply sub-sequence symmetries. Each stacking sequence configuration is presented together with dimensionless parameters from which the extensional and bending stiffness terms are readily calculated. Expressions relating the dimensionless parameters to the well-known lamination parameters are also given, together with graphical representations of feasible domains for all sub-sequence symmetries containing standard ply angle combinations i.e. ±45, 0 and 90°. Quasi-isotropic (A IB 0D F) laminates are also presented as an important subset of A SB 0D F laminates. Finally, bounds on buckling performance under shear and compression are presented.
UR - http://www.scopus.com/inward/record.url?scp=84855621577&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84855621577
SN - 9781600867422
T3 - Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
BT - 51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
T2 - 51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
Y2 - 12 April 2010 through 15 April 2010
ER -