Nonlinear Dynamic Analysis of Composite Laminate Plates Subjected to Explosive Loading

Resumo

Explosive loads have been the target of study in recent years due to the catastrophic effects that this
type of loading can cause in civil engineering structures. This phenomenon is characterized by the release of energy
in short time intervals, causing a peak of overpressure and, in sequence, a suction process, or overpressure. Due to
the high impact, this episode can generate catastrophic effects on structures, such as partial or total collapse, and
in severe cases, several deaths. At the same time, laminated plates are structural elements that are being studied
for their characteristic of improving the physical properties of the primary materials used in their composition.
Thus, this work aims to present a study on laminated plates, present in literature, subjected to blast loads to
reproduce the results. In the sequence, an evaluation of their behavior when the negative phase is not considered
is verified, to understand how this portion of the loading influences the final behavior of the structure. Finally, a
parametric study of the laminated plates is performed to determine, for each structure, equations of correlation
between the maximum displacement obtained by the structure and characteristic parameters of the shock wave. In
the calculation process, for each example present in the literature, a plate theory is used, considering second-order
effects. The differential equations are obtained according to the Total Minimum Potential Energy, in their solution,
the Galerkin method is employed, and, finally, to obtain the displacements the Runge-Kutta numerical method is
used.