Cutting-induced end surface effect on compressive behaviour of aluminium foams

Research output: Contribution to journalArticle

  • External authors:
  • Kangpei Meng
  • C. G. Chai
  • Weiguang Wang
  • Qian Wang

Abstract

Three cutting methods, i.e. electrical discharge machining (EDM), band saw (BS) and water jet (WJ), were used to prepare cuboid samples of closed-cell aluminium Alporas foam. On the end surfaces of the prepared samples, local roughness of mesoscopic structural components (i.e. cell wall, node and facet) and global roughness for the entire cut surface were measured using confocal microscopy. Furthermore, quasi-static uniaxial compression tests were performed with intermittent unloading-reloading. In the initial stage of compression, the measured loading stiffness and unloading elastic modulus are highest, intermediate and lowest for the EDM-cut, BS-cut and WJ-cut samples, respectively. This difference in measured compressive properties has been correlated with the difference in end-surface roughness associated with different cutting methods. However, the peak and plateau of compressive stress and the unloading elastic modulus in the plateau stage are insensitive to cutting method. An analytical model has been developed to elucidate the observed compressive behaviour and shed light on the responsible mechanisms.

Bibliographical metadata

Original languageEnglish
Pages (from-to)410-418
JournalEuropean Journal of Mechanics, A/Solids
Volume75
Early online date27 Feb 2019
DOIs
Publication statusPublished - 1 May 2019