Abstract
The scope of the present work is to elucidate the reverberations of propagating guided waves through delaminated regions confined in composite plate structures. As it is well known, delamination between consequent plies is the most common type of damage in composite structures. A mean of investigation of delamination cracks is through guided wave propagation. It has been observed that either type of guided waves (antisymmetric or symmetric) has different repercussions inside and outside the delaminated area. Inside this work is used a well-established numerical tool developed by the authors. By making good use of its reported numerical capabilities, the authors used the Hermitian Cubic Splined Layerwise mechanics to incorporate the delamination and the physical presence of piezoelectric actuators. The two mentioned aspects were then integrated into a time domain spectral finite element. The outcome was the development of a multinode explicit layerwise finite element, able of modelling the physical presence of active piezoelectric sensors, the existence of delamination cracks through the thickness and the excitation of each fundamental wave mode separately (A0 &S0). The calculated semi-diagonal mass matrix, due to the collocation of the nodes with the grid points of Gauss–Lobatto–Legendre quadrature, boosts the speed of numerical time integration, while the use of high order polynomials as shape functions, conduce to a vast reduction of the mesh size, enabling the thorough investigation and simulation of high frequency wave propagation.
Published Version
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