Análise dinâmica de placas metálicas submetidas a carregamentos explosivos considerando efeito de membrana através do método dos elementos finitos

Abstract

With the occurrence of vast explosive events on a global scale, which can be either accidental, or intentional, it becomes essential to investigate the dynamic behavior of structures under such loading. Explosive phenomena generate overpressure waves (positive phase), followed by underpressure waves (negative phase), which were until recently neglected. However, research conducted over the years highlights that the negative phase can cause displacements and stresses as significant as the positive phase. This study addresses a comparison between the von Karmán SDOF analytical model, employed in the DYNAblast 1.1 (2024) software, and the numerical model developed using the ABAQUS v6.14-1 finite element program, for the calibration of the structure used. In order to examine the behavior of simply supported, isotropic and linearly elastic slender plates, considering the explosive load and the worst-case membrane effect: immovable. Parametric analyses were carried out, concluding that variables such as explosive mass (WTNT), scaled distance (Z), and geometric modifications of the structure have significant impacts. The negative phase showed greater influence in scenarios with lower explosive mass, as well as in scaled distances greater than 5 m/kg1/3.