The main objective of this work is the development of finite element models capable of predicting the structural damping and the damped structural response of laminated composite blades and beams. The theoretical framework presented in the current work consists of two main parts. Firstly, the material coupling effect on the static and modal characteristics of composite structures is investigated. New damping terms encompassing strong material coupling effects are formulated and incorporated into a new 3-D beam finite element capable of predicting the modal characteristics of composite structures. The second part deals with the inclusion of nonlinear effects due to large rotations and initial stresses, the prediction of nonlinear damped structural dynamics and the characterization of the damping of laminated composite strips subject to large in-plane tensile and compressive loads. The nonlinear section mechanics were incorporated into a new nonlinear tubular beam finite element and a research finite element analysis code which enable the computational prediction of nonlinear characteristics of composite blades. The finite element is first applied and experimentally validated for the case of composite strips subject to initial tensile and compressive loads. Based on the successful validation of the nonlinear strip element, an extended nonlinear tubular beam finite element for the damping prediction in more complicated composite structures, such as wind-turbine blade models, is also formulated and presented.
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Dimitrios I. Chortis
- Springer International Publishing