Exact corotational shell for finite strains and fracture

  • Authors:

  • P. Areias;J. Garção;E. B. Pires;J. Infante Barbosa

  • Affiliations:

  • Departamento de Física, Colégio Luís António Verney, Universidade de Évora, Évora, Portugal 7002-554 and ICIST, Lisbon, Portugal;Departamento de Física, Colégio Luís António Verney, Universidade de Évora, Évora, Portugal 7002-554 and IDMEC, Lisbon, Portugal;ICIST, Lisbon, Portugal and Departamento de Engenharia Civil e Arquitectura, Instituto Superior Técnico, Lisbon, Portugal 1049-001;Departamento de Física, Colégio Luís António Verney, Universidade de Évora, Évora, Portugal 7002-554 and IDMEC, Lisbon, Portugal

  • Venue:
  • Computational Mechanics
  • Year:
  • 2011

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Abstract

The corotational method for frame-invariant elements is generalized to obtain a consistent large-strain shell element incorporating thickness extensibility. The resulting element allows arbitrary in-plane deformations and is distinct from the traditional corotational methods (either quadrature-based or element-based) in the sense that the corotational frame is exact. The polar decomposition operation is performed in two parts, greatly simplifying the linearization calculations. Expressions for the strain-degrees-of-freedom matrices are given for the first time. The symbolic calculations are performed with a well-known algebraic system with a code generation package. Classical linear benchmarks are shown with excellent results. Applications with hyperelasticity and finite strain plasticity are presented, with asymptotically quadratic convergence and very good benchmark results. An example of finite strain plasticity with fracture is solved successfully, showing remarkable robustness without the need of enrichment techniques.