Type

Journal Article

Authors

M. D. Gilchrist
Liang Cui
Manuel A. Forero Rueda

Subjects

Engineering

Topics
optimisation finite element modelling layered foam liner energy absorbing liner head impact safety helmets equestrian material

Optimisation of energy absorbing liner for equestrian helmets. Part I: Layered foam liner (2009)

Abstract The energy absorbing foam liner used in safety helmets was optimised using finite element modelling. Computational simulations of certification standard tests were carried out to obtain the best performing configurations of helmet liner. For each test condition, the best configuration of helmet liner was identified. Two alternative designs were considered: the first was composed of three layers of different foam density, the second was a conventional liner of one single uniform density. The observed reduction in peak acceleration for the best performing helmet liners in various test conditions are directly related to the contact area, the distribution of material stresses and the dissipated plastic energy density (DPED). Peak linear accelerations are shown to be lowered by increasing the contact areas of the inner and outer surfaces of the energy absorbing liner, or by varying the foam density through the thickness of the liner to ensure that the foam absorbs energy plastically when the stress reaches the late plateau stage of the foam stress–strain curve.
Collections Ireland -> University College Dublin -> Mechanical & Materials Engineering Research Collection
Ireland -> University College Dublin -> College of Engineering & Architecture
Ireland -> University College Dublin -> School of Mechanical and Materials Engineering

Full list of authors on original publication

M. D. Gilchrist, Liang Cui, Manuel A. Forero Rueda

Experts in our system

1
M. D. Gilchrist
University College Dublin
Total Publications: 172