Journal
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
Volume 336, Issue -, Pages 39-79Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cma.2018.02.027
Keywords
Isogeometric analysis; Trimmed shell surfaces; Kirchhoff-Love shells; Weakly enforced interface constraints; STEP exchange format; Abaqus
Funding
- National Science Foundation through the NSF CAREER [1651577]
- NSF [CISE-156599]
- National Natural Science Foundation of China [11602106]
- Natural Science Foundation of Jiangsu Province of China [BK20160783]
- Office of Naval Research [N00014-17-1-2119, N00014-13-1-0500]
- NSF/TARDEC [16504383]
- Army Research Office [W911NF-13-1-0220]
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Following a series of recent innovations, isogeometric shell analysis based on trimmed CAD surfaces is currently being developed into an accurate, efficient and mature design-through-analysis methodology. This work contributes to this emerging technology with respect to the following aspects. On the analysis side, we present a robust variationally consistent Nitsche-type formulation for thin shells at large deformations that weakly enforces coupling constraints at trimming curves. On the geometry side, we present a set of algorithms that enable automatic interaction of trimmed shell analysis with CAD data structures based on the STEP exchange format. We integrate these methodologies in a comprehensive framework for isogeometric trimmed shell analysis. We demonstrate that our framework is able to seamlessly perform large-deformation stress analysis of an industry-scale 76-patch surface model of a Dodge RAM hood, while delivering comparable accuracy with respect to Simulia's commercial software package Abaqus. (C) 2018 Elsevier B.V. All rights reserved.
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