Bulk properties of open cell polyurethane foam are studied in a hydrostatic compression experiment under strain control. A linear region of behaviour is observed in the stress-strain curve, followed by a non-monotonic region corresponding to a negative incremental bulk modulus. The bulk modulus in the linear region is in reasonable agreement with the value calculated from compressional Young's modulus and Poisson's ratio. The linear region of behaviour in hydrostatic compression corresponds to less than half the axial strain range observed in axial compression.
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References
1.
GibsonL.J. and AshbyM.F., Cellular Solids: Structure and Properties, Cambridge: Cambridge University Press (1997).
2.
KoW.L., Deformations of foamed elastomers, J. Cell. Plast., 1, (1965) 45–49.
3.
GentA.N. and ThomasA.G.The deformation of foamed elastic materials, J. Appl. Polym. Sci., 1, (1959) 107–112.
4.
GibsonL.J. and AshbyM.F., The mechanics of three-dimensional cellular materials, Proc. R. Soc. Lond. A, 382, (1982) 43–56.
5.
StrongeW.J. and ShimV.P.W., Microdynamics of crushing in cellular solids, J. Engineering Materials Technology, 110, (1988) 185–190.
6.
LakesR.S., RosakisP. and RuinaA., Microbuckling instability in elastomeric cellular solids, J. Materials Science, 28, (1993) 4667–4672.
7.
AbeyaratneR. and TriantafyllidisN.An investigation of localization in a porous elastic material using homogenization theory, J. Applied Mechanics, 51, (1984) 481–486.
8.
ResnickI., A buoyancy material for undersea depths. U. S. Patent 3,477,967, (1969).
9.
LeeK.J. and WestmannR.A., Elastic properties of hollow-sphere-reinforced composites, Journal of Composite Materials4, (1970) 242–253.
10.
LakesR.S., Experimental microelasticity of two porous solids, International Journal of Solids and Structures, 22, (1986) 55–63.
11.
ShawM.C. and SataT., The plastic behavior of cellular materials, Int. J. Mech. Sci., 8, (1966) 469–478.
12.
WilseaM., JohnsonK.L. and AshbyM.F., Indentation of foamed plastics, Int. J. Mech. Sci., 17, (1975) 457–460.
13.
MajiA.K., SchreyerH.L., DonaldS., ZuoQ. and SatpathiD., Mechanical properties of polyurethance foam impact limiters, Journal of Engineering Mechanics, 121, (1995) 528–540.
14.
Masso MoreuY. and MillsN.J., Rapid hydrostatic compression of low density polymeric foams, Polymer Testing, 23, (2004) 313–322.
15.
LiQ.M., MinesR.A.W. and BirchR.S., The crush behavior of Rochacell-51WF structural foam, International Journal of Solids and Structures, 37, (2000) 6321–6341.
16.
SridharI. and FleckN.A., The multiaxial yield behaviour of an aluminum alloy foam, Journal of Materials Science, 40, (2005) 4005–4008.
17.
LakesR.S., Foam structures with a negative Poisson's ratio, Science, 235, (1987) 1038–1040.
18.
ZhuH.X., KnottJ.F. and MillsN.J., Analysis of the elastic properties of open-cell foams with tetrakaidecahedral cells, J. Mech. Phys. Solids, 45, (1997) 319–343.
19.
ChauK.T., Young's modulus interpreted from compression tests with end friction, J. Engineering Mechanics (ASCE), 123, (1997) 1–7.
20.
MooreB., JaglinskiT., StoneD.S. and LakesR.S., Negative incremental bulk modulus in foams, Philosophical Magazine Letters, 86, (2006) 651–659.
21.
TriantafilouT.C., ZhangJ., ShercliffT.L., GibsonL.J. and AshbyM.F., Failure surfaces for cellular materials under multiaxial loads II. Comparison of models with experiment, Int. J. Mechanical Sci., 31, (1989) 665–678.
