Deformation behavior of open-cell dry natural rubber foam: Effect of different concentration of blowing agent and compression strain rate

Abstract

, were investigated by performing compressive deformation at different strains and strain rates. Different concentrations of sodium bicarbonate as a blowing agent (BA) were utilized, from 4 to 16 phr in order to produce foams with range of cell size and morphology. Overall, increasing of blowing agent concentration had significantly changed relative foam density. Compression stress-strain curves of the foams exhibited that the compression behavior was directly correlated to the foam cells morphology and physical density. Pronounced changes were noticed for foams with bigger cells particularly at 4 phr concentration of BA where the compression stress at plateau region was greater compared to those with higher concentration of BA. Cell deformation progressive images confirmed that the foams demonstrated small degree of struts bending at 15% of strain and followed by continuous severe struts bending and elastic buckling up to 50% of strain. Compression test at different strain rates revealed that the strain rate factor only affected the foams with 4 phr of BA by causing immediate increment in the compression stress value when higher strain rate was applied.

Mechanical compaction mechanisms in the input sediments of the Sumatra Subduction Complex- insights from microstructural analysis of cores from IODP Expedition- 362

“…11). In deforming granular foam material, bending was reported as the dominant deformation mechanism for the reduction in porosity and developing preferred alignment of the long axis of pores perpendicular to the applied stress (Elliott et al, 2002, Zhou et al, 2004Samsudin et al, 2017;Zakaria et al, 2018) studies on the experimental deformation of granular foam is described in supplementary data-16). Friction adheres clay particles to the edge of pores while the middle of particles drops into the pore, resulting in bending by intracrystalline slip.…”

Mechanical compaction mechanisms in the input sediments of the Sumatra subduction complex – insights from microstructural analysis of cores from IODP Expedition 362

“…14a to f). In deforming granular foam material, bending was reported as the dominant deformation mechanism for the reduction in porosity and developing preferred alignment of the long axis of pores perpendicular to the applied stress (Elliott et al, 2002;Zhou et al, 2004;Samsudin et al, 2017;Zakaria et al, 2018) (a review of these earlier studies on the experimental deforma-tion of granular foam is described in Document S2). Friction adheres clay particles to the edge of pores while the middle of particles drops into the pore, resulting in bending by inter-particle slip.…”