Tensile failure of two-dimensional quasi-brittle foams

K. R. Mangipudi, P. R. Onck*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Scopus)

Abstract

Stress redistribution caused by damage onset and the subsequent local softening plays an important role in determining the ultimate tensile strength of a cellular structure. The formation of damage process zones with struts dissipating a finite amount of fracture energy will require the macroscopic stress to be increased in order to continue structural damage. The goal of this paper is to investigate the influence of the fracture energy of the solid on the tensile fracture strength and the strain to fracture in quasi-brittle two-dimensional foams using a microstructural model. We analyze the mesoscopic damage and failure mechanisms in uniaxial tension. Relative density, strut cross-sectional profile, solid's fracture strain, and fracture energy are varied systematically. The effect of the specific fracture energy on the peak behavior has been shown to be captured by the ratio of the fracture energy to the stored elastic energy. We have also explored the net section strength variation in the presence of a central crack at two different fracture energies. Comparison is made between two structurally identical quasi-brittle and ductile strain hardening foams to identify the differences in the damage mechanisms. (C) 2012 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)2823-2829
Number of pages7
JournalInternational Journal of Solids and Structures
Volume49
Issue number19-20
DOIs
Publication statusPublished - 1-Oct-2012

Keywords

  • Quasi-brittle failure
  • Cellular structure
  • Non-uniform struts
  • Notches
  • METALLIC FOAMS
  • DAMAGE
  • BEHAVIOR

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