Effect of strain rate and load orientation on cyclic response of anisotropic polyurethane foam

Anisotropic cellular materials, such as polymeric foams, play an important role in structures subjected to cyclic loadings. The present paper provides an experimental investigation of the mechanical behavior of an anisotropic polyurethane foam subjected to cyclic compressive loadings under two perpe...

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Bibliographic Details
Published in:Cellular polymers 2022-07, Vol.41 (4), p.147-162
Main Authors: Ben Abdeljelil, Dorra, Chatti, Sami, O Ahmed Ben Ali, Raja
Format: Article
Language:English
Subjects:
Anisotropy
Cellular structure
Compressive properties
Cyclic loads
Deformation
Elongation
Empirical analysis
Energy
Energy absorption
Impact tests
Investigations
Manufacturing
Mechanical properties
Modulus of elasticity
Plastic foam
Plastic foams
Polyurethane foam
Shear tests
Strain rate
Stress-strain curves
Yield stress
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Summary:Anisotropic cellular materials, such as polymeric foams, play an important role in structures subjected to cyclic loadings. The present paper provides an experimental investigation of the mechanical behavior of an anisotropic polyurethane foam subjected to cyclic compressive loadings under two perpendicular orientations: the rising and perpendicular directions. The foam samples are loaded under three different strain rates and various deformations. The experimental results are presented in terms of elasticity modulus, maximal compressive stress, effective energy absorption capacity, and residual strain. It is proved that the investigated polyurethane foam presents a macroscopic mechanical anisotropy caused by microscopic cell elongation in the foaming direction. Moreover, it is demonstrated that the mechanical behavior of the foam is fully influenced by both deformation rates and imposed strains. The experimental stress–strain curves are modelized using an empirical model considering an adjustable modulus of elasticity. The analytical results show a good agreement with the experiments.
ISSN:0262-4893
1478-2421
DOI:10.1177/02624893221084895