Honeycomb Sandwich Material Modelling
For Dynamic Simulations Of A Crash-box
For A Racing Car
Author(s)
S. Boria & G. Forasassi
Abstract
Aluminium sandwich construction has been recognized as a promising concept
for structural purposes in lightweight transportation systems. The aim of the
present study is to investigate, through experiment as well as numerical
approaches, the energy absorbing capabilities of a thin-walled crash-box, made
of sandwich material, for a racing car. The basic considered structures are panels
composed of two aluminium alloy sheets and an aluminium hexagonal cells
honeycomb core. Several crash tests were performed, in the conditions related to
a frontal impact at the velocity of 12 m/s, in order to acquire information on the
dynamic behaviour of the mentioned structure; during these tests the
load-deformation diagram, the deceleration and the energy absorbed by the
structure were measured. A finite element model is then developed using the
non-linear, explicit dynamic code LS-DYNA. In order to characterize the
material and to set up the numerical model, a series of strength tests were carried
out on aluminium honeycomb-cored sandwich panel specimens. By means of
these preliminary tests some necessary material parameters were determined.
The simulation results accurately predicted the average deceleration, the specific
absorbed energy and the total deformation of the specimen, but appeared to
slightly overestimate the initial peak load obtained in the crash tests. Therefore
the performed investigation can help to build confidence in the future possibility
of using non-linear dynamic finite element code LS-DYNA for the design of
sandwich primary structures subjected to crash loading, especially after a further
tuning up of the models and material characteristics.
Keywords: aluminium sandwich panel, LS-DYNA, dynamic simulation, plastic
collapse.
Keywords
aluminium sandwich panel, LS-DYNA, dynamic simulation, plastic
collapse.
Related Book
Other papers in this volume
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