Effects of boundary condition and cell structure on dynamic axial crushing honeycomb

The dynamic axially crushing behavior of metal honeycombs was studied with placing emphasis on the effects of boundary condition and cell structure on its characteristics as an energy absorber. Numerical honeycomb models of some metal foil materials were made by taking the plastic deformation of adh...

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Autores principales:	Tsutomu UMEDA, Koji MIMURA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2018
Materias:	honeycomb energy absorption boundary condition strain rate dependence Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/3550f062bd7d4056b0bbdb4cd10c832c
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spelling	oai:doaj.org-article:3550f062bd7d4056b0bbdb4cd10c832c2021-11-26T07:16:02ZEffects of boundary condition and cell structure on dynamic axial crushing honeycomb2187-974510.1299/mej.17-00571https://doaj.org/article/3550f062bd7d4056b0bbdb4cd10c832c2018-04-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/5/2/5_17-00571/_pdf/-char/enhttps://doaj.org/toc/2187-9745The dynamic axially crushing behavior of metal honeycombs was studied with placing emphasis on the effects of boundary condition and cell structure on its characteristics as an energy absorber. Numerical honeycomb models of some metal foil materials were made by taking the plastic deformation of adhesive layer, the failure of adhesively-bonded joint and the initial imperfection into account. Then, firstly, the foil material and the branch angle φ of cell geometry were varied to examine the effects on the crushing behavior and the energy absorption capacity. Secondly, to investigate the effects of boundary condition on the crushing mode and the energy absorption capacity, some boundary conditions such as the fixed end condition, the contact condition at the upper and lower ends and the periodic boundary condition at the side surfaces were applied to the honeycomb model. Typical calculated results under different strain rates and geometric conditions were compared with the corresponding experimental results, and the effects of material properties on the mean buckling stress were discussed. It was found that for the material with strain rate dependence, the stress increment of crushing honeycomb due to increasing the strain rate was 30-40 % as large as that of the material itself. Small φ causes different deformation mode of wrinkles, and the mean buckling stress σm decreased about 50 % by changing φ from 120° to 30°. Furthermore, small-scale honeycomb with small φ is easy to be affected by free edges considerably at φ = 60°. The oblique loading condition caused the transition from axial collapse to bending collapse so that at the crush angle of 45° σm became 30-50 % smaller than that under the vertical loading condition, while the effect of the direction of oblique load on σm is not so large.Tsutomu UMEDAKoji MIMURAThe Japan Society of Mechanical Engineersarticlehoneycombenergy absorptionboundary conditionstrain rate dependenceMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 5, Iss 2, Pp 17-00571-17-00571 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	honeycomb energy absorption boundary condition strain rate dependence Mechanical engineering and machinery TJ1-1570
spellingShingle	honeycomb energy absorption boundary condition strain rate dependence Mechanical engineering and machinery TJ1-1570 Tsutomu UMEDA Koji MIMURA Effects of boundary condition and cell structure on dynamic axial crushing honeycomb
description	The dynamic axially crushing behavior of metal honeycombs was studied with placing emphasis on the effects of boundary condition and cell structure on its characteristics as an energy absorber. Numerical honeycomb models of some metal foil materials were made by taking the plastic deformation of adhesive layer, the failure of adhesively-bonded joint and the initial imperfection into account. Then, firstly, the foil material and the branch angle φ of cell geometry were varied to examine the effects on the crushing behavior and the energy absorption capacity. Secondly, to investigate the effects of boundary condition on the crushing mode and the energy absorption capacity, some boundary conditions such as the fixed end condition, the contact condition at the upper and lower ends and the periodic boundary condition at the side surfaces were applied to the honeycomb model. Typical calculated results under different strain rates and geometric conditions were compared with the corresponding experimental results, and the effects of material properties on the mean buckling stress were discussed. It was found that for the material with strain rate dependence, the stress increment of crushing honeycomb due to increasing the strain rate was 30-40 % as large as that of the material itself. Small φ causes different deformation mode of wrinkles, and the mean buckling stress σm decreased about 50 % by changing φ from 120° to 30°. Furthermore, small-scale honeycomb with small φ is easy to be affected by free edges considerably at φ = 60°. The oblique loading condition caused the transition from axial collapse to bending collapse so that at the crush angle of 45° σm became 30-50 % smaller than that under the vertical loading condition, while the effect of the direction of oblique load on σm is not so large.
format	article
author	Tsutomu UMEDA Koji MIMURA
author_facet	Tsutomu UMEDA Koji MIMURA
author_sort	Tsutomu UMEDA
title	Effects of boundary condition and cell structure on dynamic axial crushing honeycomb
title_short	Effects of boundary condition and cell structure on dynamic axial crushing honeycomb
title_full	Effects of boundary condition and cell structure on dynamic axial crushing honeycomb
title_fullStr	Effects of boundary condition and cell structure on dynamic axial crushing honeycomb
title_full_unstemmed	Effects of boundary condition and cell structure on dynamic axial crushing honeycomb
title_sort	effects of boundary condition and cell structure on dynamic axial crushing honeycomb
publisher	The Japan Society of Mechanical Engineers
publishDate	2018
url	https://doaj.org/article/3550f062bd7d4056b0bbdb4cd10c832c
work_keys_str_mv	AT tsutomuumeda effectsofboundaryconditionandcellstructureondynamicaxialcrushinghoneycomb AT kojimimura effectsofboundaryconditionandcellstructureondynamicaxialcrushinghoneycomb
_version_	1718409710991835136

Effects of boundary condition and cell structure on dynamic axial crushing honeycomb

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