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Continuum models for stretching- and bending-dominated periodic trusses undergoing finite deformations

Glaesener, Raphaël N. and Lestringant, Claire and Telgen, Bastian and Kochmann, Dennis M. (2019) Continuum models for stretching- and bending-dominated periodic trusses undergoing finite deformations. International Journal of Solids and Structures, 171 . pp. 117-134. ISSN 0020-7683. http://resolver.caltech.edu/CaltechAUTHORS:20190415-151326350

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Abstract

Advances in additive manufacturing across scales have enabled the creation of random, periodic, or hierarchical truss networks containing millions and more of individual truss members. In order to significantly reduce computational costs while accurately capturing the dominant deformation mechanisms, we introduce a simple yet powerful homogenized continuum description of truss lattices, which is based on applying a multi-lattice Cauchy-Born rule to a representative unit cell (RUC). Beam theory applied at the level of the RUC introduces rotational degrees of freedom and leads to a generalized continuum model that depends on the effective deformation gradients, rotation, and curvature on the macroscale. While affinely deforming the RUC is shown to produce excellent results for simple Bravais lattices, a multi-lattice extension is required for general and especially bending-dominated lattices, which cannot be described by a pure Taylor expansion of the RUC deformation; the importance of the multi-lattice concept is demonstrated through analytical examples. The resulting method is a beneficial compromise between inefficient FE^2 techniques and micropolar theories with limited applicability. By implementing the model within a finite element framework, we solve and report several benchmark tests in 2D to illustrate the accuracy and efficiency of the model, which comes with only a small fraction of the computational costs associated with the full, discrete truss calculation. By using a corotational beam description, we also capture finite beam rotations. We further demonstrate that a second-gradient homogenization formulation is beneficial in examples involving localization, providing higher local accuracy at the RUC level than a first-gradient scheme, while affecting the global response only marginally.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.ijsolstr.2019.04.022DOIArticle
ORCID:
AuthorORCID
Kochmann, Dennis M.0000-0002-9112-6615
Additional Information:© 2019 Elsevier Ltd. Received 3 January 2019, Revised 23 March 2019, Accepted 11 April 2019, Available online 12 April 2019.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-16-1-2431
Subject Keywords:truss; homogenization; finite element method; finite deformation
Record Number:CaltechAUTHORS:20190415-151326350
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20190415-151326350
Official Citation:Raphaël N. Glaesener, Claire Lestringant, Bastian Telgen, Dennis M. Kochmann, Continuum models for stretching- and bending-dominated periodic trusses undergoing finite deformations, International Journal of Solids and Structures, Volume 171, 2019, Pages 117-134, ISSN 0020-7683, https://doi.org/10.1016/j.ijsolstr.2019.04.022. (http://www.sciencedirect.com/science/article/pii/S002076831930191X)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:94718
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:16 Apr 2019 20:16
Last Modified:29 May 2019 17:16

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