Modeling the Nonlinear Deformation of Highly Porous Cellular Plastics Filled with Clay Nanoplatelets

Rigid low-density plastic foams subjected to mechanical loads typically exhibit a nonlinear deformation stage preceding failure. At moderate strains, when the geometrical nonlinearity is negligible, such foam response is predominantly caused by the nonlinearity of deformation of their principal stru...

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Bibliographic Details
Published in:Materials 2022-01, Vol.15 (3), p.1033
Main Authors: Lagzdiņš, Aivars, Zilaucs, Alberts, Beverte, Ilze, Andersons, Jānis
Format: Article
Language:English
Subjects:
Carbon
Cellular structure
Clay
Composite materials
Deformation
Density
Load
Mechanical properties
Morphology
Nonlinearity
Plastic foam
Plastic foams
Polymers
Polyurethane foam
Porous materials
Stress-strain curves
Stress-strain relationships
Structural members
Structural models
Struts
Tensile stress
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Summary:Rigid low-density plastic foams subjected to mechanical loads typically exhibit a nonlinear deformation stage preceding failure. At moderate strains, when the geometrical nonlinearity is negligible, such foam response is predominantly caused by the nonlinearity of deformation of their principal structural elements-foam struts. Orientational averaging of stresses in foam struts enables estimation of the stresses taken up by foams at a given applied strain. Based on a structural model of highly porous anisotropic cellular plastics filled with clay nanoplatelets and the orientational averaging, a method for calculating their nonlinear deformation is derived in terms of structural parameters of the porous material, the mechanical properties of the monolithic polymer, and filler particles and their spatial orientation. The method is applied to predicting the tensile stress-strain diagrams of organoclay-filled low-density rigid polyurethane foams, and reasonable agreement with experimental data is demonstrated.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma15031033