Experimental Verification of Cell Shape-Collapse Relationships in Metallic Foams by Photoelasticity Method

Year 2019, , 1101 - 1110, 01.12.2019

Ersin Bahceci Yusuf Ozcatalbas

https://doi.org/10.2339/politeknik.490993

Abstract

In the present study, the effect of
cell morphology on mechanical properties in metallic foams with Al based closed
cells was examined. AlSi8Mg0.8 alloyed metallic foam materials were produced by
the Powder Metallurgy (PM) method. The elastic stresses and their distributions
which were created by the compression load in the metallic foams, producing in
similar density and different cell sizes were investigated by the
photoelasticity method. The fracture and collapse mechanisms of the foaming
materials, having the same density but different cell size and shape factor,
exhibited discrepancy as well. The elastic stress concentrations and their
distributions that were created by compression at the cell walls could be
determined by the photoelasticity method. It was detected that the fringe
orders in the photoelasticity images provided important and accurate
information about the stress concentration areas at the foam walls. It was
specified that the collapse at the end of the compression tests started mostly
at these areas.  

Keywords

Metallic foam, cell morphology, photoelasticity, stress distribution, collapse

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