Balanced and symmetric laminates: new perspectives on an old design rule

York, C.B. and Weaver, P.M. (2010) Balanced and symmetric laminates: new perspectives on an old design rule. In: 51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Orlando, FL, USA, 12-15 April 2010, (doi: 10.2514/6.2010-2775)

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Stacking sequence listings are presented for bend-twist coupled laminates (ASB0DF), 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 degrees. Quasi-isotropic (AIB0DF) laminates are also presented as an important sub-set of ASB0DF laminates. Finally, bounds on buckling performance under shear and compression are presented.

Item Type:Conference Proceedings
Glasgow Author(s) Enlighten ID:York, Dr Christopher
Authors: York, C.B., and Weaver, P.M.
College/School:College of Science and Engineering > School of Engineering > Autonomous Systems and Connectivity

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