Abstract (EN):
Sandwich plates represent an efficient structural element providing a high stiffness-weight ratio
characteristic. Moreover, when using this structural element, different design configurations and
materials in the core can be adopted in order to obtain desired properties. From high dissipation
elastomers to light and stiff honeycombs, several core materials can be applied, looking for high
damping ratios or simply to obtain an high flexural stiffness/weight ratio.
Despite the huge interest on the sandwich structures, its numerical modeling requires special attention
in the representation of the skin/core relation phenomena. This aspect assumes an important role when
dealing with soft cores. In fact, despite the difficulties arising from the high skin/core modulus ratio,
which requires a representative displacement field descriptor, the numerical model should take into
consideration the permissible transversal deformation to which the core may be submitted to.
Currently, the modeling of such behavior requires the application of layerwise models accomplishing
for a complete 3D spatial field description, which lead usually to a high computational cost during the
simulation of sandwich panels.
In this paper, to trim down the computational cost, it is proposed a simpler and cost-effective
layerwise model based on a two-dimensional displacement field descriptor. This finite element is
formulated by using a plate finite element to represent the in-plane and out-plane deformation field of
each layer, and a bar finite element to represent the nodal transversal displacement degree-of-freedom.
The proposed finite element formulation and numerical implementation are assessed by comparison
with results obtained from other modeling methodologies. Furthermore, the finite element model is
also validated through the correlation analysis between the numerical results and the experimental data
obtained from a dynamic analysis of representative specimens.
Idioma:
Português
Tipo (Avaliação Docente):
Científica
Contacto:
jdr@fe.up.pt