Optimal Design for Out-Plane Characteristics of Piezoelectric Hybrid Laminated Composite using Extended Lamination Parameters
- Paper number
IAC-07-C2.5.08
- Author
Mr. Yohsuke Nambu, University of Tokyo, Japan
- Coauthor
Prof. Junjiro Onoda, Japan Aerospace Exploration Agency (JAXA)/ISAS, Japan
- Year
2007
- Abstract
Composite materials, such as CFRP (Carbon Fiber Reinforced Plastic) have received great attention on both academic and practical fields. Their anisotropic properties make it possible for laminated composite materials to own not only high specific stiffness and strength but also various dynamical characteristics. The characteristics of laminated composites strongly depend on lay-up configuration, namely the thickness and orientation angle of each layer of composite materials. Therefore, it is very important to design lay-up configuration of laminated composites optimally. It is well known that the method using lamination parameters is available for optimal design problems of laminated composites. Lamination parameters are geometric 12 parameters. They are moment integrations of trigonometric functions of orientation angles along thickness direction. It is possible to consider all lay-up configurations with them. Many researchers have applied them to investigate dynamical characteristics of laminated composites. Recently, smart structure materials have received great attention too. They have functions as an actuator and sensor, in addition to high specific stiffness and strength. PHLC (Piezoelectric Hybrid Laminated Composite) is one of them. It is a hybrid laminated composite which consists of fiber reinforced plastics and anisotropic piezoelectric materials. The dynamical and driving characteristics strongly depend on the lay-up configuration of composite layers and the lay-up configuration and applied voltage of each layer of piezoelectric materials. Therefore, it is very important to design the lay-up configuration and applied voltage distribution of PHLC optimally. It might be desirable to use lamination parameters for optimal problems. However, lamination parameters are not able to deal with the design of the applied voltage distribution. Then this research proposes new parameters named as extended lamination parameters to design the lay-up configuration and applied voltage distribution of PHLC. They are 33 parameters which are moment integrations of products of three distribution functions - material function, lay-up function and voltage distribution function - and represent one lay-up configuration and applied voltage distribution. In this research, lamination configuration is limited to symmetric lamination, and only out-plane characteristics are considered. Then 11 extended lamination parameters govern them. The optimal method using extended lamination parameters needs a feasible region of them where the parameters correspond to actual lay-up configuration and voltage distribution. This research show that the region of 11 parameters is obtained by numerical method based on variational method and that deign of PHLC which has desired out-plane characteristics are dealt with by optimal method using 11 extended lamination parameters.
- Abstract document
- Manuscript document
IAC-07-C2.5.08.pdf (🔒 authorized access only).
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