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Deriving a lattice model for neo-Hookean solids from finite element methods

Teng zhang's picture

Lattice models are popular methods for simulating deformation of solids by discretizing continuum structures into spring networks. Despite the simplicity and efficiency, most lattice models only rigorously converge to continuum models for lattices with regular shapes. Here, we derive a lattice model for neo-Hookean solids directly from finite element methods (FEM). The proposed lattice model can handle complicated geometries and tune the material compressibility without significantly increasing the complexity of the model. Distinct lattices are required for irregular structures, where the lattice spring stiffness can be pre-calculated with the aid of FEM shape functions. Multibody interactions are incorporated to describe the volumetric deformation. We validate the lattice model with benchmark tests using FEM. The simplicity and adoptability of the proposed lattice model open possibilities to develop novel numerical platforms for simulating multiphysics and multiscale problems via integrating it with other modeling techniques.


Teng zhang's picture

The Matab codes for the three numerical examples in the manuscript can be downloaded from the following link

The codes are modified from the FEM codes in Prof. Allan Bower's online text book

The current codes can be used to learn the implementation of lattice models and also provide a short cut for students to learn nonlinear finite element simulations.

Deat Teng,

Thank you for sharing these m files.


Best regards

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