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Design Framework for Mechanically Tunable Soft Biomaterial Composite Enhanced by Modified Horseshoe Lattice Structures

Abstract

Soft biomaterials have wide applications in many areas. However, one material can only cover a specific range of mechanical performance such as the elastic modulus and stretchability. In order to improve the mechanical performance of soft biomaterials, lattice structures are embedded to reinforce the biomaterials. In this paper, rectangular and triangular lattice structures formed by modified horseshoe microstructures are used because their mechanical properties are tunable and can be tailored precisely to match the desire properties by adjusting four geometrical parameters, the length L, radius R, width w and arc angle 0. A theoretical design framework for the modified horseshoe lattice structures is developed to predict the dependence of the mechanical behaviors on geometrical parameters. Both experiments and finite element simulations on lattice structures are conducted to validate the theoretical models. Results show that a wide range of design space for the elastic modulus (a few kPa to hundreds of MPa), stretchability (strain up to 180%) and Poisson ratio (ranging from -0.5 to 1.2) can be achieved. Experiments on lattice-hydrogel composites are also conducted to verify the reinforcement effect of lattice structures on the hydrogel. This work provides a theoretical method to predict the mechanical behaviors of the lattice structures and aid the rational design of the reinforced biomaterials, which has applications in tissue engineering, drug delivery and intraocular lenses.

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Article information


Submitted
25 Oct 2019
Accepted
06 Jan 2020
First published
06 Jan 2020

Soft Matter, 2020, Accepted Manuscript
Article type
Paper

Design Framework for Mechanically Tunable Soft Biomaterial Composite Enhanced by Modified Horseshoe Lattice Structures

D. Wang, Y. Xiong, B. Zhang, Y. Zhang, D. Rosen and Q. Ge, Soft Matter, 2020, Accepted Manuscript , DOI: 10.1039/C9SM02119A

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