Energy absorption of axially crushed expanded metal tubes

This paper investigates the axial crushing response of concentric expanded metal tubes under impact loading. The study is conducted by means of nonlinear finite element simulations, considering the speed of deformation and the size of the expanded metal cells. In the analysis, two tubes are placed concentrically and then axially crushed with an impact mass at various speed levels. Crushing loaddisplacement responses are analyzed to investigate the influence of the size of the mesh and the impact speed. The results show that specimens with the same mesh sizes increases their crushing length with increasing speed. Finally the main outcome of this investigation is to add to the state of knowledge information concerning the use of expanded metal meshes in impact attenuation devices.

Section: Introductionmentioning

confidence: 99%

Axial Crushing of Concentric Expanded Metal Tubes Under Impact Loading

Graciano

Borges

Martínez

et al. 2017

“…In contrast, for α =90° the collapse can be rather instable. Placing expanded metal tubes concentrically enhances the energy absorption characteristics of the individual configurations (Martínez et al 2013, Smith et al 2014.…”

Section: Introductionmentioning

confidence: 99%

Energy Absorption Characteristics of Coiled Expanded Metal Tubes Under Axial Compression

Smith

Graciano

Teixeira

et al. 2016

This paper presents an experimental investigation on the axial crushing of coiled expanded metal tubes subjected to quasi-static compressive loading. The investigation aims at comparing the energy absorption characteristics between tubes fabricated with coiled expanded metal meshes and solid plates. Then, a series of quasistatic axial crushing tests were performed to obtain the structural performance on coiled tubes, and then compare these with round and square solid tubes. Coiled tubes were fabricated using circular and square geometries, as well as various cell orientations. The results showed that cell orientation enhance the energy absorption response of the coiled tubes. Regarding these responses in comparison to those of solid tubes, the results showed that for coiled and solid tubes with the same weight, the energy absorption capacity of the former is much lesser than the latter.

“…With due regard of the tests conducted on long and short aluminum tubes, their global and progressive buckling were studies. In short, metal energy absorbers fail under axial compressive loads in various modes including axial collapse, global buckling, or at a point depending on geometric parameters (length and cross sectional area) (Martínez et al, 2013). Gupta and Venkatesh (2006) also conducted experimental and numerical studies on cylindrical aluminum sheets with different lengths and diameters.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of lattice-walled cylindrical shell under low axial impact velocities

Hatami

Nouri

2015

This research was an experimental and numerical investigation of the cylindrical expanded Sheets under impact loading. Two types of absorbers with different cell angles were examined (i.e.  =0 and  =90). The experiments were performed using the drop hammer setup, and the numerical simulations were conducted by ABAQUS. In this study, the type of collapse, force-displacement diagrams, the crushing length, and the absorbed energy were investigated. The experimental and numerical results were compared, and it was observed that they were in good agreement. Results showed that the absorbers with the cell angle of α=0 had a symmetric collapse and a high energy absorption capacity. Also, various heights of fall were considered for the impact mass to examine the type of collapse in the models. The crushing amounts of the models were also compared in different heights. Multi-walled expanded metal tubes were studied, and the effect of being multi-walled in collapse was examined.Keywords Expanded metal energy absorbers; energy absorption capacity; dynamic axial loading; effect of impact force; finite element.Experimental and numerical investigation of lattice-walled cylindrical shell under low axial impact velocities Nomenclature A the cross section and yield stress at Eq.7