Sensitivity Analysis for the Manufacturing of Thermoplastic e-Preforms for Active Textile Reinforced Thermoplastic Composites

AbstractActive fibre-reinforced thermoplastic composites offer a high application potential for lightweight structures capable for series production. By the integration of functional components like material-embedded piezoceramic actuators or sensors the structural behaviour becomes actively controllable and manipulable. Currently, a wide application of such adaptive structures is mainly restricted by the lack of robust manufacture technologies. Therefore, these investigations are performed to develop and realise a novel robust and efficient manufacture process capable for series production. This process bases on a material and actuator adapted hot pressing technique. In this context, special regard is given to the sub process e-preforming. There a thermoplastic film is assembled with thermoplastic compatible piezoceramic modules and the necessary conductive paths. By the development of a special e-preforming unit and the corresponding parameter investigations an adapted manufacture of so called e-preforms can be realised

Experimental Investigation on the Deformation Response of Hybrid 3D Woven Composites

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/97059/1/AIAA2012-1572.pd

Nonlinear dynamic response and modeling of a bi-stable composite plate for applications to adaptive structures

This paper discusses the formulation and validation of a low order model to capture the dynamics of a bi-stable composite plate, focusing on the dynamics around its stable states. More specifically, the model aims to capture the complex nonlinear subharmonic behavior observed in the dynamic response of the plate. A system identification approach is used to derive simplified equations of motion for the system. Experimental frequency response diagrams are obtained to characterize the observed dynamics in the identification process. Simulations using the identified model are presented showing excellent agreement with the experimentally observed behavior. A theoretical validation of the model is carried out studying the stability of the modes where subharmonic response was observed. Stability boundaries were computed using averaging techniques showing good agreement with experimental results