Mixed Tetrahedral Elements for the Analysis of Structures with Material and Geometric Nonlinearities. Issue 1 (21st October 2015)

• Record Type: Journal Article
• Authors: Nodargi, Nicola A.; Bisegna, Paolo
• Is Part Of: Proceedings in applied mathematics and mechanics. Volume 15:Issue 1(2015)
• Page Start: 219
• Page End: 220
• Publication Date: 2015-10-21
• Subjects: Applied mathematics -- Periodicals; Engineering mathematics -- Periodicals; Mathematical physics -- Periodicals; 519
• DOI: 10.1002/pamm.201510100
• Languages: English
• ISSNs: 1617-7061

Abstract

Abstract: A new mixed tetrahedral element, particularly suited for the analysis of structures exhibiting nonlinear material and geometric behavior, is here presented. Its derivation is based on a Hu–Washizu type formulation, including also rotation and skew‐symmetric stress fields as independent variables, instrumental to equip the element with nodal rotational degrees of freedom. A Gauss‐point‐discontinuous interpolation is selected for the total strain field, in order to account for its possibly highly nonlinear spatial distribution due to inelastic strains. Accordingly, the resulting tetrahedron can properly describe inelastic effects occurring over a space scale smaller than the element size. An original and efficient iterative procedure is proposed to perform the element state determination. Geometric nonlinearities are treated by means of the corotational approach. A numerical simulation is presented to analyze the element performances. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)