Unbalanced and symmetric laminates: new perspectives on a less common design rule

York, C. (2013) Unbalanced and symmetric laminates: new perspectives on a less common design rule. In: 19th International Conference on Composite Materials, Montreal, Canada, 28 Jul - 2 Aug 2013,

Abstract

The definitive list of extension-shearing and bending-twisting coupled composite laminates, with up to 21 plies, is presented. The listings comprise of individual stacking sequences, which are characterized in terms of angle- and cross-ply sub-sequence symmetries as well as the blend-ratio of un-balanced angle-plies. Dimensionless parameters are provided, from which the extensional and bending stiffnesses are readily calculated for any fibre/matrix system and angle-ply orientation. Comparisons are made between the structural response of the new extension-shearing and bending-twisting coupled laminates and others possessing both extension-shearing coupling only or bending-twisting coupling only, which typically arise in un-balanced and symmetric or balanced and symmetric designs, respectively. These comparisons involve the buckling interaction of infinitely long plates, which serve to isolate the effects of each form of coupling behaviour and highlight the detrimental effects of bending-twisting coupling on compression buckling strength as well as the beneficial effects on shear buckling strength. Finally, the scope for laminate tapering is investigated, using single or multiple ply terminations.

• Item Type: Conference Proceedings
• Keywords: Warp-free, tapered, non-symmetric, extension-shearing bending-twisting coupled laminates
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: York, Dr Christopher
• Authors: York, C.
• Subjects: T Technology > T Technology (General)
• College/School: College of Science and Engineering > School of Engineering > Infrastructure and Environment