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Open AccessArticle

On the Influence of Inhomogeneous Interphase Layers on Instabilities in Hyperelastic Composites

1
Department of Mechanical Engineering, University of Wisconsin Madison, Madison, WI 53706, USA
2
Department of Aerospace Engineering, Technion—Israel Institute of Technology, Haifa 32000, Israel
*
Author to whom correspondence should be addressed.
Materials 2019, 12(5), 763; https://doi.org/10.3390/ma12050763
Received: 16 January 2019 / Revised: 26 February 2019 / Accepted: 28 February 2019 / Published: 6 March 2019
(This article belongs to the Special Issue Soft Materials)
Polymer-based three-dimensional (3D) printing—such as the UV-assisted layer-by-layer polymerization technique—enables fabrication of deformable microstructured materials with pre-designed properties. However, the properties of such materials require careful characterization. Thus, for example, in the polymerization process, a new interphase zone is formed at the boundary between two constituents. This article presents a study of the interphasial transition zone effect on the elastic instability phenomenon in hyperelastic layered composites. In this study, three different types of the shear modulus distribution through the thickness of the interphasial layer were considered. Numerical Bloch-Floquet analysis was employed, superimposed on finite deformations to detect the onset of instabilities and the associated critical wavelength. Significant changes in the buckling behavior of the composites were observed because of the existence of the interphasial inhomogeneous layers. Interphase properties influence the onset of instabilities and the buckling patterns. Numerical simulations showed that interlayer inhomogeneity may result in higher stability of composites with respect to classical layup constructions of identical shear stiffness. Moreover, we found that the critical wavelength of the buckling mode can be regulated by the inhomogeneous interphase properties. Finally, a qualitative illustration of the effect is presented for 3D-printed deformable composites with varying thickness of the stiff phase. View Full-Text
Keywords: 3D printing; inhomogeneous interphase; instability; fiber composites; microscopic instability 3D printing; inhomogeneous interphase; instability; fiber composites; microscopic instability
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MDPI and ACS Style

Arora, N.; Batan, A.; Li, J.; Slesarenko, V.; Rudykh, S. On the Influence of Inhomogeneous Interphase Layers on Instabilities in Hyperelastic Composites. Materials 2019, 12, 763.

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