Comparative study on bending behavior and damage analysis of 3D-printed sandwich core designs with bio-inspired reinforcements
Abstract
In this study, novel sandwich core designs with bio-inspired reinforcements were proposed
and their bending behaviors were comparatively examined. The geometrical shapes of alligator osteoderm and chambered nautilus shell were utilized as bio-inspired reinforcements
for sandwich core structures. Sandwich core structures were produced through the additive
manufacturing method. Experimental tests and finite element analysis were performed to
determine the bending performances of the proposed sandwich core structures. The loadcarrying capacity, deformation ability, damage-tolerant capability, energy absorption, and
damage mechanisms of the proposed sandwich core structures were comparatively investigated
through experimental and numerical methods. The orthotropic material model and Hashin’s
damage criterion were used in the numerical model of 3D-printed sandwich core structures to
consider the effect of the filament raster orientation on the elastic and damage behavior of
the sandwich core structures. Compared to the classical honeycomb sandwich core structure,
while bio-inspired reinforcements improved the load-carrying capacity and damage-tolerant
capability of sandwich core structures, they reduced the energy absorption ability of sandwich
core structures due to reducing the vertical deformation ability of sandwich core structures.
Bio-inspired reinforcements significantly affected the stress distribution and damage behavior
of the sandwich core structures. They reduced von Mises stress level at the outer cell edges of
the sandwich core structures and caused reinforcement damage instead of outer cell damage.
