Frequency response analysis of hybrid aluminium beam with piezoelectric actuators was performed using finite element method The finite element model was implemented in Matlab software. The one-dimensional beam element is based on Euler-Bernoulli theory and it assumes bilinear distribution of electric field potential. The piezoelectric actuators were driven by harnonic signal around the first eigenfrequency and the beam oscillations were investigated. Results were compared to experiment. and Obsahuje seznam literatury
This work focuses on analysis of longfiber unidirectional carbon-epoxy composite using finite element method on a unit cell. A micromechanical model of he unit cell is created in computational system MSC Marc using orthotropic elastic fibers and isotropic elastoplastic matrix. The plasticity of the matrix is prescribed in the model by a hardening function. Material parameters of the
micromodel are identified using gradient optimization method in OptiSLang system. In the optimization, stress-strain relations obtained from the micromodel are compared with the stress-strain relations from a nonlinear macromodel. The macromodel of the composite material was created in author‘s previous work. Parameters of the macromodel were identified from experimental tensile tests also using optimization with MSC Marc and OptiSLang. and Obsahuje seznam literatury