Lateral collapse of short‐length sandwich tubes compressed by different indenters and exposed to external constraints

Gilchrist

Olabi

2016

Thin-Walled Structures

Self Cite

129

This paper presents the responses of nested tube systems under quasi-static and dynamic lateral loading. Nested systems in the form of short internally stacked tubes were proposed as energy absorbing structures for applications that have limited crush zones. Three configurations of nested tube systems were experimentally analysed in this paper. The crush behaviour and energy absorbing responses of these systems under various loading conditions were presented and discussed. It was found that the quasi-static and dynamic responses of the nested systems were comparable under an experimental velocity of v=4.5 m/sec. This is due to insignificant strain rate and inertia effects of the nested systems under the applied velocity. The performance indicators, which describe the effectiveness of energy absorbing systems, were calculated to compare the various nested systems and the best system was identified. Furthermore, the effects of geometrical and loading parameters on the responses of the best nested tube system were explored via performing parametric analysis. The parametric study was performed using validated finite element models. The outcome of this parametric study was full detailed design guidelines for such nested tube energy absorbing structures.

Section: Experimental Set-upmentioning

confidence: 99%

mentioning

confidence: 99%

Quasi-static, impact and energy absorption of internally nested tubes subjected to lateral loading

Gilchrist

Olabi

2016

Thin-Walled Structures

Self Cite

129

“…These components collapse progressively when they are subjected to impact loading, absorbing the kinetic energy of the moving mass and converting it into plastic strains energy. The thin-walled tubes showed excellent energy absorption performance under the various types loading including axial loading [2], [3], lateral loading [4]- [10], oblique loading [11], and bending loading [12], [13]. However, with the increased demand to develop light-weight vehicles that consume less fuel and cause reduced air pollution, automotive engineers needed to develop structures that are lightweight without compromising their crashworthiness performance.…”

Section: Introductionmentioning

confidence: 99%

Application of Cellular Material in Crashworthiness Applications: An Overview

Reference Module in Materials Science and Materials Engineering

Arjunan

Niknejad

et al. 2019

Cellular foams are a modern class of materials with unique mechanical properties that have wide ranging engineering applications, in the areas of biomedical, acoustic and thermal insulation, and crashworthiness. Recently, foam materials have received increased attention for vehicle crashworthiness due to their lightweight and excellent energy absorption capabilities that allow significant weight reduction without compromising structural safety aspects. Accordingly, this paper reviews the crush and energy absorption behaviour of foam-filled structures that can be used for crashworthy design in transport engineering. In addition, the mechanical and dynamic properties of cellular material and their role on the crashworthiness performance of filled structure are discussed. Particularly, the influences of foam density and interactions, between the foam and the tubes, on the deformation mode of the filled structures are clarified. The advantages offered by the innovative foam material, which contains a density gradient, on the crashworthiness behaviour are also highlighted. Also, a brief summary of optimisation studies involving the use of foam-filled structures are presented. It was found that the cellular materials improve the crashworthiness performance when they are used as filler material in thin-walled energy absorbers due to their capability of altering the deformation mode to a more favourable one.

“…structures, a few numbers of studies have been performed to investigate the collapse behaviour and energy absorption response of foam-filled structures under lateral loading [12,[29][30][31][32].…”

mentioning

confidence: 99%

Analysis and optimization of sandwich tubes energy absorbers under lateral loading

International Journal of Impact Engineering

Gilchrist

Smyth

et al. 2015

Self Cite

110

Abstract:In this paper, the sandwich tubes, which consist of thin-walled circular tubes with aluminium foam core, were proposed as energy absorption devices. The sandwich tubes were laterally crushed under quasi-static loading conditions. Detailed finite element model, validated against existing experimental results, was developed using the explicit code (ANSYS-LSDYNA) to assess the energy absorption responses and deformation modes. Response surface methodology (RSM) was employed in parallel with the finite element models to perform both parametric studies and multi-objective optimization in order to establish the optimal configuration of the sandwich tube.Sampling designs of the sandwich tubes were constructed based on a D -optimal design of experiment (DOE) method. Factorial analysis was performed using the DOE results to investigate the influences of the geometric parameters on the responses of sandwich tubes. In addition, multi-objective optimization design (MOD) of the sandwich tubes is carried out by adopting a desirability approach. It was found that the tube with a minimum diameter of the inner layer and a maximum foam thickness are more suitable for use as energy absorbing components.