This article presents an experimental investigation of the effect of the skin layer on the mechanical behavior of a closed-cell polymeric foam material. The skin layer is a thin layer with increased density due to the manufacturing processes, which results in inhomogeneity. The skin-layer effect is investigated by comparing the stretch-stress characteristics of specimens with and without this skin layer on a particular closed-cell polyethylene foam sheet. The characteristics were recorded via uniaxial tension and compression tests, respectively, in all principal manufacturing directions. Thus, the skin-layer effect can be obtained by analyzing the recorded data points, which are also presented. The skin-layer-free specimens are prepared with a particularly designed assembly in accordance with the ASTM standards.
StorakersB. On material representation and constitutive branching in finite compressible elasticity. J Mech Phys Solids1986; 34: 125–145.
8.
LiBGuYDEnglishR. Characterisation of nonlinear material parameters of foams based on indentation tests. Mater Design2009; 3: 2708–2714.
9.
BriodyCDuignanBJerramsS. The implementation of a visco-hyperelastic numerical material model for simulating the behaviour of polymer foam materials. Computat Mater Sci2012; 64: 47–51.
10.
SchrodtMBenderothGKühhornA. Hyperelastic description of polymer soft foams at finite deformations. Technische Mechanik2005; 25: 162–173.
11.
PetreMTErdemirACabanaghPR. Determination of elastomeric foam parameters for simulations of complex loading. Comp Meth Biomech Biomed Engg2006; 9: 231–242.
RizviSJAAlaeiMHYadavA. Quantitative analysis of cell distribution in injection molded microcellular foam. J Cell Plast2014; 50: 199–219.
14.
MiH-YJingXPengJ. Influence and prediction of processing parameters on the properties of microcellular injection molded thermoplastic polyurethane based on an orthogonal array test. J Cell Plast2013; 49: 439–458.
15.
KubokiT. Mechanical properties and foaming behavior of injection molded cellulose fiber reinforced polypropylene composite foams. J Cell Plast2014; 50: 129–143.
16.
AhmadzaiAZBehraveshAH. Bulk density reduction of Injection molded thermoplastic foams via a mold design approach. J Cell Polym2014; 33: 21–43.
17.
PintoJSolórzanoERodriguez-PerezMA. Characterization of the cellular structure based on user-interactive image analysis procedures. J Cell Plast2012; 49: 555–575.
18.
MichaeliWFlorezLObeloerD. Analysis of the impact properties of structural foams. J Cell Plast2009; 45: 321–351.
19.
MechraouiARiedlBRodrigueD. Mechanical properties of polypropylene structural foams with fiber-reinforced skins. J Cell Plast2011; 47: 115–132.
20.
MohyeddinA. Theoretical evaluation of tensile and flexural moduli of structural polymer foams. J Cell Plast2014; 50: 221–239.
21.
BlanchetJFRodrigueD. The effect of skin thickness on the mechanical properties of structural foams. J Cell Polym2004; 23: 193–210.
22.
BarzegariMRRodrigueD. Prediction of the shear modulus of polymer structural foams. J Cell Plast2009; 45: 555–576.
23.
El-RatalWHMallickPK. Elastic response of flexible polyurethane foams in uniaxial tension. J Engg Mater Technol1996; 118: 157–161.
24.
MurphyJGRogersonGA. A method to model simple tension experiments using finite elasticity theory with and application to some polyurethane foams. Int J Engg Sci2002; 40: 499–510.
25.
Wolfram Research: 2010, Mathematica Edition: Version 8.0, Wolfram Research.
26.
American Standard for Testing and Materials (ASTM), D 3576-98, Standard method for cell size of rigid cellular plastics, 1999.
27.
International Organization of Standardisation (ISO), EN ISO 3386-1, Polymeric materials, cellular flexible – determination of stress-strain characteristic in compression – part 1: low density materials, 1986.
28.
American Standard for Testing and Materials (ASTM), D 3574-03, Standard test method for flexible cellular materials – slab, bonded and molded urethane foams, 2003.
