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Stress–displacement stabilized finite element analysis of thin structures using Solid-Shell elements, Part II: Finite strain hyperelasticity.

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Title: Stress–displacement stabilized finite element analysis of thin structures using Solid-Shell elements, Part II: Finite strain hyperelasticity.
Authors: Aguirre, A.1,2 (AUTHOR) alejandro.aguirre@upc.edu, Codina, R.1,3 (AUTHOR) ramon.codina@upc.edu, Baiges, J.1,3 (AUTHOR) joan.baiges@upc.edu, Castañar, I.1 (AUTHOR) icastanar@cimne.upc.edu
Source: Finite Elements in Analysis & Design. Sep2024, Vol. 236, pN.PAG-N.PAG. 1p.
Subjects: Finite element method, Displacement (Mechanics), Hypergraphs, Infinitesimal geometry
Abstract: This work is the second of a two-part research project focused on modeling solid-shell elements using a stabilized two-field finite element formulation. The first part introduces a stabilization technique based on the Variational Multiscale framework, which is proven to effectively address numerical locking in infinitesimal strain problems. The primary objective of the study was to characterize the inherent numerical locking effects of solid-shell elements in order to comprehensively understand their triggers and how stabilized mixed formulations can overcome them. In this current phase of the work, the concept is extended to finite strain solid dynamics involving hyperelastic materials. The aim of introducing this method is to obtain a robust stabilized mixed formulation that enhances the accuracy of the stress field. This improved formulation holds great potential for accurately approximating shell structures undergoing finite deformations. To this end, three techniques based in the Variational Multiscale stabilization framework are presented. These stabilized formulations allow circumventing the compatibility restriction of interpolating spaces of the unknowns inherent to mixed formulations, thus allowing any combination of them. The accuracy of the stress field is successfully enhanced while maintaining the accuracy of the displacement field. These improvements are also inherited to the solid-shell elements, providing locking-free approximation of thin structures. • A Stabilized finite element method for the mixed displacement–stress approach is presented. • Solid-shell models are considered in finite strain hyperelasticity using the total Lagrangian approach. • The fully stabilized and linearized formulation is presented. • The final formulation is accurate and robust, free of any type of locking. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:This work is the second of a two-part research project focused on modeling solid-shell elements using a stabilized two-field finite element formulation. The first part introduces a stabilization technique based on the Variational Multiscale framework, which is proven to effectively address numerical locking in infinitesimal strain problems. The primary objective of the study was to characterize the inherent numerical locking effects of solid-shell elements in order to comprehensively understand their triggers and how stabilized mixed formulations can overcome them. In this current phase of the work, the concept is extended to finite strain solid dynamics involving hyperelastic materials. The aim of introducing this method is to obtain a robust stabilized mixed formulation that enhances the accuracy of the stress field. This improved formulation holds great potential for accurately approximating shell structures undergoing finite deformations. To this end, three techniques based in the Variational Multiscale stabilization framework are presented. These stabilized formulations allow circumventing the compatibility restriction of interpolating spaces of the unknowns inherent to mixed formulations, thus allowing any combination of them. The accuracy of the stress field is successfully enhanced while maintaining the accuracy of the displacement field. These improvements are also inherited to the solid-shell elements, providing locking-free approximation of thin structures. • A Stabilized finite element method for the mixed displacement–stress approach is presented. • Solid-shell models are considered in finite strain hyperelasticity using the total Lagrangian approach. • The fully stabilized and linearized formulation is presented. • The final formulation is accurate and robust, free of any type of locking. [ABSTRACT FROM AUTHOR]
ISSN:0168874X
DOI:10.1016/j.finel.2024.104179