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Effects of Interface on the Mechanical Properties of Filled Polymer Hexagonal Honeycombs: A Comparison Between Different Designs



Polymer-filled hexagonal honeycomb structures have been extensively used as impact resistant materials. Though filled hexagonal honeycombs demonstrate excellent behavior under in-plane compression loadind, their tensile properties are poor. However, a material needs to be strong in tension as well as compression because it undergoes both tension and compression cycles under impact loading. The objective of this study is to determine the best designs with competing functionalities such as stiffness, strength and toughness for polymer filled hexagonal honeycombs. The hexagonal architectures have been designed by considering the cellular walls made of a stiff polymer such as PMMA while the filler material has been chosen as a soft, viscous polymer such as Polyurethane. Mechanical properties under tensile loading have been characterized for various design modifications within the hexagonal architecture in a finite element based study where a no-slip condition has been assumed between stiff-soft polymer interfaces. To determine the toughness and the composite’s failure properties, contact, and cohesive zones have been described across the stiff-soft polymer interfaces. Uniaxial tensile behavior for the designs varies depending on interface properties. The material property charts were developed for the design modifications to draw a comparison between their competing properties such as stiffness and toughness.

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