Experimental Investigation Of The Energy
Absorption Capability Of Bonded Crash Boxes
Author(s)
L. Peroni & M. Avalle
Abstract
In the design of vehicle structures for crashworthiness there is a need for rigid
subsystems that guarantee an undeformable survival cell for the passengers and
deformable subsystems able to efficiently dissipate the kinetic energy. The front
rail is the main deformable component dissipating energy in a frontal impact,
which is the most dangerous crash situation. In frontal impact these rails have the
greatest influence on vehicle crash performance. The design of the front rail,
usually consisting of a thin walled prismatic column, requires definition of the
geometry, that is, of the shape and dimensions of the cross section, of the
thickness of the material, and of the material itself. In this work the analysis of
the effect of different cross sections of the front rail and of the joining system is
carried out. Furthermore, the collapse during crash is influenced by the loading
rate since the loading speed has substantial influence on the mode of collapse
and on the material behaviour. In fact, the structural materials used in this
application are known to be strain-rate sensitive. Within the work, different types
of sections are compared. The ground-breaking joining technology of bonding is
examined: three different types of adhesive are compared, an acrylic, a one
component epoxy and a two component epoxy. Adhesives can be used as a
substitute to the widely used spot-welding to improve the structure performance
mainly because of the continuous joint. The effects of the loading speed are
taken into account by comparing quasi-static crush tests with dynamic impact
tests. Dynamic tests have been performed under a drop tower testing apparatus
built within the Vercelli campus of the II Faculty of Engineering of the
Politecnico di Torino.
Keywords: bonded structures, adhesive bonding, energy absorbing components.
Keywords
bonded structures, adhesive bonding, energy absorbing components.
Related Book
Other papers in this volume
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