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

In the present study, the effect of cell morphology on mechanical properties in metallic foams with al based closed cells wasexamined. alsi8mg0.8 alloyed metallic foam materials were produced by the powder metallurgy (pm) method. the elastic stressesand their distributions which were created by the compression load in the metallic foams, producing in similar density and differentcell sizes were investigated by the photoelasticity method. the fracture and collapse mechanisms of the foaming materials, havingthe same density but different cell size and shape factor, exhibited discrepancy as well. the elastic stress concentrations and theirdistributions that were created by compression at the cell walls could be determined by the photoelasticity method. it was detectedthat the fringe orders in the photoelasticity images provided important and accurate information about the stress concentration areasat the foam walls. it was specified that the collapse at the end of the compression tests started mostly at these areas.