Dynamic compressive strength properties of aluminium foams. Part I - Experimental data and observations.

Puay Joo Tan, Stephen R Reid, John J Harrigan, Z. Zou, S. Li

Research output: Contribution to journalArticle

252 Citations (Scopus)

Abstract

This study of the dynamic compressive strength properties of metal foams is in two parts. Part I presents data from an extensive experimental study of closed-cell Hydro/Cymat aluminium foam, which elucidates a number of key issues and phenomena. Part II focuses on modelling issues.

The dynamic compressive response of the foam was investigated using a direct-impact technique for a range of velocities from 10 to 210 ms(-1). Elastic wave dispersion and attenuation in the pressure bar was corrected using a deconvolution technique.

A new method of locating the point of densification in the nominal stress-strain curves of the foam is proposed, which provides a consistent framework for the definition of the plateau stress and the densification strain, both essential parameters of the 'shock' model in Part II. Data for the uniaxial, plastic collapse and plateau stresses are presented for two different average cell sizes of approximately 4 and 14 mm. They show that the plastic collapse strength of the foam changes significantly with compression rate. This phenomenon is discussed, and the distinctive roles of microinertia and 'shock' formation are described. The effects of compression rates on the initiation, development and distribution of cell crushing are also examined. Tests were carried out to examine the effects of density gradient and specimen gauge length at different rates of compression and the results are discussed. The origin of the conflicting conclusions in the literature on the correlation between nominal strain rate epsilon (ratio of the impact velocity V-i to the initial gauge length l(o) of the specimen) and the dynamic strength of aluminium alloy foams is identified and explained. (c) 2005 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)2174-2205
Number of pages31
JournalJournal of the Mechanics and Physics of Solids
Volume53
Issue number10
DOIs
Publication statusPublished - Oct 2005

Keywords

  • foams
  • dynamic properties
  • size and length effects
  • strain rate
  • steady-shock wave
  • HOPKINSON PRESSURE BAR
  • STRAIN-RATE
  • INERTIA
  • HONEYCOMB
  • SOLIDS
  • IMPACT
  • WAVE

Cite this

Dynamic compressive strength properties of aluminium foams. Part I - Experimental data and observations. / Tan, Puay Joo; Reid, Stephen R; Harrigan, John J; Zou, Z.; Li, S.

In: Journal of the Mechanics and Physics of Solids, Vol. 53, No. 10, 10.2005, p. 2174-2205.

Research output: Contribution to journalArticle

@article{1374e607ca6d412ebdee990c7a2aefcd,
title = "Dynamic compressive strength properties of aluminium foams. Part I - Experimental data and observations.",
abstract = "This study of the dynamic compressive strength properties of metal foams is in two parts. Part I presents data from an extensive experimental study of closed-cell Hydro/Cymat aluminium foam, which elucidates a number of key issues and phenomena. Part II focuses on modelling issues.The dynamic compressive response of the foam was investigated using a direct-impact technique for a range of velocities from 10 to 210 ms(-1). Elastic wave dispersion and attenuation in the pressure bar was corrected using a deconvolution technique.A new method of locating the point of densification in the nominal stress-strain curves of the foam is proposed, which provides a consistent framework for the definition of the plateau stress and the densification strain, both essential parameters of the 'shock' model in Part II. Data for the uniaxial, plastic collapse and plateau stresses are presented for two different average cell sizes of approximately 4 and 14 mm. They show that the plastic collapse strength of the foam changes significantly with compression rate. This phenomenon is discussed, and the distinctive roles of microinertia and 'shock' formation are described. The effects of compression rates on the initiation, development and distribution of cell crushing are also examined. Tests were carried out to examine the effects of density gradient and specimen gauge length at different rates of compression and the results are discussed. The origin of the conflicting conclusions in the literature on the correlation between nominal strain rate epsilon (ratio of the impact velocity V-i to the initial gauge length l(o) of the specimen) and the dynamic strength of aluminium alloy foams is identified and explained. (c) 2005 Elsevier Ltd. All rights reserved.",
keywords = "foams, dynamic properties, size and length effects, strain rate, steady-shock wave, HOPKINSON PRESSURE BAR, STRAIN-RATE, INERTIA, HONEYCOMB, SOLIDS, IMPACT, WAVE",
author = "Tan, {Puay Joo} and Reid, {Stephen R} and Harrigan, {John J} and Z. Zou and S. Li",
year = "2005",
month = "10",
doi = "10.1016/j.jmps.2005.05.007",
language = "English",
volume = "53",
pages = "2174--2205",
journal = "Journal of the Mechanics and Physics of Solids",
issn = "0022-5096",
publisher = "Elsevier Limited",
number = "10",

}

TY - JOUR

T1 - Dynamic compressive strength properties of aluminium foams. Part I - Experimental data and observations.

AU - Tan, Puay Joo

AU - Reid, Stephen R

AU - Harrigan, John J

AU - Zou, Z.

AU - Li, S.

PY - 2005/10

Y1 - 2005/10

N2 - This study of the dynamic compressive strength properties of metal foams is in two parts. Part I presents data from an extensive experimental study of closed-cell Hydro/Cymat aluminium foam, which elucidates a number of key issues and phenomena. Part II focuses on modelling issues.The dynamic compressive response of the foam was investigated using a direct-impact technique for a range of velocities from 10 to 210 ms(-1). Elastic wave dispersion and attenuation in the pressure bar was corrected using a deconvolution technique.A new method of locating the point of densification in the nominal stress-strain curves of the foam is proposed, which provides a consistent framework for the definition of the plateau stress and the densification strain, both essential parameters of the 'shock' model in Part II. Data for the uniaxial, plastic collapse and plateau stresses are presented for two different average cell sizes of approximately 4 and 14 mm. They show that the plastic collapse strength of the foam changes significantly with compression rate. This phenomenon is discussed, and the distinctive roles of microinertia and 'shock' formation are described. The effects of compression rates on the initiation, development and distribution of cell crushing are also examined. Tests were carried out to examine the effects of density gradient and specimen gauge length at different rates of compression and the results are discussed. The origin of the conflicting conclusions in the literature on the correlation between nominal strain rate epsilon (ratio of the impact velocity V-i to the initial gauge length l(o) of the specimen) and the dynamic strength of aluminium alloy foams is identified and explained. (c) 2005 Elsevier Ltd. All rights reserved.

AB - This study of the dynamic compressive strength properties of metal foams is in two parts. Part I presents data from an extensive experimental study of closed-cell Hydro/Cymat aluminium foam, which elucidates a number of key issues and phenomena. Part II focuses on modelling issues.The dynamic compressive response of the foam was investigated using a direct-impact technique for a range of velocities from 10 to 210 ms(-1). Elastic wave dispersion and attenuation in the pressure bar was corrected using a deconvolution technique.A new method of locating the point of densification in the nominal stress-strain curves of the foam is proposed, which provides a consistent framework for the definition of the plateau stress and the densification strain, both essential parameters of the 'shock' model in Part II. Data for the uniaxial, plastic collapse and plateau stresses are presented for two different average cell sizes of approximately 4 and 14 mm. They show that the plastic collapse strength of the foam changes significantly with compression rate. This phenomenon is discussed, and the distinctive roles of microinertia and 'shock' formation are described. The effects of compression rates on the initiation, development and distribution of cell crushing are also examined. Tests were carried out to examine the effects of density gradient and specimen gauge length at different rates of compression and the results are discussed. The origin of the conflicting conclusions in the literature on the correlation between nominal strain rate epsilon (ratio of the impact velocity V-i to the initial gauge length l(o) of the specimen) and the dynamic strength of aluminium alloy foams is identified and explained. (c) 2005 Elsevier Ltd. All rights reserved.

KW - foams

KW - dynamic properties

KW - size and length effects

KW - strain rate

KW - steady-shock wave

KW - HOPKINSON PRESSURE BAR

KW - STRAIN-RATE

KW - INERTIA

KW - HONEYCOMB

KW - SOLIDS

KW - IMPACT

KW - WAVE

U2 - 10.1016/j.jmps.2005.05.007

DO - 10.1016/j.jmps.2005.05.007

M3 - Article

VL - 53

SP - 2174

EP - 2205

JO - Journal of the Mechanics and Physics of Solids

JF - Journal of the Mechanics and Physics of Solids

SN - 0022-5096

IS - 10

ER -