Mathematical and numerical approach for a crashworthy problem
Estadístiques de LA Referencia / Recolecta
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/192679
Tipus de documentText en actes de congrés
Data publicació2013
EditorCIMNE
Condicions d'accésAccés obert
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Abstract
Vehicle crashworthiness has been improving in recent years with attention mainly
directed towards reducing the impact of the crash on the passengers. An optimal way to
achieve this target is by exclusive use of specific impact attenuators, such as strategically
placed tubular elements. Many of the mechanical devices are designed to absorb impact
energy under axial crushing, bending and/or combined loading. An important requirement is
that these structural members must be able to dissipate large amount of energy by controlled
collapse in the event of a collision. Generally, the total energy dissipated depends on the
governing deformation phenomena of all or part of the structural components of simple
geometry, such as thin-walled tubes, cones, frames and sections. The energy absorbing
capacity differs from one component to the next in a manner which depends on the mode of
deformation involved and the material used.
During the last decades the attention given to crash energy management has been centred on
composite structures. The use of fibre-reinforced plastic composite materials in automotive
structures may result in many potential economic and functional benefits due to their
improved properties respect to metal ones, ranging from weight reduction to increased
strength and durability features.
Although significant experimental work on the collapse of fibre-reinforced composite shells
has been carried out, studies on the theoretical modelling of the crushing process are quite
limited since the complex and brittle fracture mechanisms of composite materials. Most of the
studies have been directed towards the axial crush analysis, because it represents more or less
the most efficient design.
In the present paper, a mathematical approach on the failure mechanisms, pertaining to the
stable mode of collapse (Mode I) of thin-walled composite circular tubes subjected to axial
loading, was investigated. The analysis was conducted from an energetic point of view; it is
therefore necessary to identify the main energy contributions and then equate the total internal
energy to the work done by the external load. The average crush load can be obtained
minimizing the force contribution, function of several variables, on a domain using a
numerical approach. Comparison between theory and experiments concerning crushing loads
and total displacements was analysed, showing how the proposed analytical model is efficient
for predicting the energy absorption capability of axially collapsing composite shells.
ISBN978-84-941407-6-1
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