This study aims to investigate the effect of honeycomb structure filled with graded
and nongraded polyurethane foam on reaction force during energy absorption under
in-plane and out-of-plane loadings. Three types of aluminum AL5052 honeycomb
structures without filling, with graded filling and with nongraded filling were
manufactured and subjected to quasistatic compression loading. In order to
investigate the effect of reaction force and energy absorption capacity, honeycomb
cores with different densities were selected. Afterward, the behavior of honeycomb
structures was numerically simulated in the ABAQUS software. The results of finite
element analysis show that using foam filling in honeycomb structures increases
energy absorption. The structures filled with graded foam, shows better performance
with the rate of stiffness reduction from impact location compared to those
filled with nongraded foam. Energy absorption for graded foam structure
occurs at a longer time period comparing to nongraded one. The energy
absorption capacity of the structure under out-of-plane loading is much
higher than in-plane loading, but its reaction force is very high. The results of
empirical tests are greatly similar to that of numerical studies. Therefore, it is
possible to use simulation in ABAQUS environment for solving more complex
problems.
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