Browsing by Author "Wells, G N"
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Discontinuities in regularised media
Simone, A; Wells, G N; Sluys, L J (2003)Discontinuous interpolation of the problem fields in nonlocal and ratedependent media is considered. The necessity of discontinuities in the analysis of failure processes and some of the requirements for the introduction ... 
Discontinuous Modelling of Crack Propagation in a GradientEnhanced Continuum
Simone, A; Wells, G N; Sluys, L J (200207)A numerical model for the description of the combined continuous/discontinuous failure in a regularised strainsoftening continuum is proposed. The continuum is regularised through the introduction of gradient terms into ... 
Discontinuous modelling of strain localisation and failure
Wells, G N (20010612)The computational simulation of failure in solids poses many challenges. A proper understanding of how structures respond under loading, both before and past the peak load, is important for safe and economical constructions. ... 
Discrete analysis of localisation in threedimensional solids
Wells, G N; Sluys, L J (200009)A procedure is illustrated for the determination of the normal direction of a discontinuity plane within a solid finite element. Using socalled embedded discontinuities, discrete constitutive models can be applied within ... 
DOLFIN: Automated Finite Element Computing
Logg, Anders; Wells, G N (2009)We describe here a library aimed at automating the solution of partial differential equations using the finite element method. By employing novel techniques for automated code generation, the library combines a high level ... 
DOLFIN: Automated finite element computing
Logg, Anders; Wells, G N (20090225)We describe here a library aimed at automating the solution of partial differential equations using the finite element method. By employing novel techniques for automated code generation, the library combines a high level ... 
Embedded discontinuities for softening solids
Wells, G N; Sluys, L J (1999)Additional, discontinuous functions are added to the displacement field of standard finite elements in order to capture highly localised zones of intense straining. By embedding discontinuities within an element it is ... 
Formulation of continuous/discontinuous Galerkin methods for strain gradientdependent damage
Molari, Luisa; Garikipati, Krishna; Wells, G N (2005)Continuum damage models are widely used to represent the development of microscopic defects that coalesce into a macroscopic crack. The microscopic defects cause a progressive weakening or softening of the material (damage). ... 
An interface element based on the partition of unity
Simone, A; Remmers, Joris J C; Wells, G N (Delft University of Technology, 2001)An alternative interface ﬁnite element is developed. By using the partition of unity property of ﬁnite element shape functions, discontinuous shape functions are added to the standard ﬁnite element basis. The interface ... 
Multilevel analysis of localisation problems
Sluys, L J; Estrin, Y; Wells, G N (200106)Localisation processes, such as shear banding and necking, have been investigated following a macroscopic and a microscopic approach. Both approaches have been formulated within a finite deformation plasticity framework. ... 
A novel technique for modelling interfaces in reinforced brittle materials
Simone, A; Wells, G N; Sluys, L J (2001)A novel numerical technique for the modelling of interfaces is introduced for the analysis of reinforced brittle materials. The method exploits the partition of unity property of finite element shape functions. By considering ... 
Optimisations for quadrature representations of finite element tensors through automated code generation
Oelgaard, Kristian B; Wells, G N (20090720)We examine aspects of the computation of finite element matrices and vectors which are made possible by automated code generation. Given a variational form in a syntax which resembles standard mathematical notation, the ... 
A padaptive scheme for overcoming volumetric locking during isochoric plastic deformation
Wells, G N; Sluys, L J (200106)A padaptive scheme is developed in order to overcome volumetric locking in low order finite elements. A special adaptive scheme is used which is based on the partition of unity concept. This allows higher order polynomial ... 
A Précis of Some Recent Developments in Computational Failure Mechanics
De Borst, R; Askes, Harm; Gutiérrez, Miguel A; Remmers, Joris J C; Wells, G N (2002)A concise overview is given of various numerical methods that can be used to analyse localisation and failure in engineering materials. The importance of the cohesivezone approach is emphasised and various ways of ... 
Representations of finite element tensors via automated code generation
Oelgaard, Kristian B; Wells, G N (20090226)We examine aspects of the computation of finite element matrices and vectors which are made possible by automated code generation. Given a variational form in a syntax which resembles standard mathematical notation, the ... 
Simulating discontinuities in a gradientenhanced continuum
Simone, A; Wells, G N; Sluys, L J (2002)A continuumdiscrete model for failure in quasibrittle materials is presented. The continuum is regularised through the introduction of gradient terms into the constitutive model. At the transition to discrete failure, ... 
A study of discontinuous Galerkin methods for thin bending problems
Dung, N T; Wells, G N (2006)Various continuous/discontinuous Galerkin formulations are examined for the analysis of thin plates. These methods rely on weak imposition of continuity of the normal slope across element boundaries. We draw here upon ... 
Supporting material for the paper 'Analysis of an interface stabilised finite element method: The advectiondiffusionreaction equation'
Wells, G N (20091028)This solver is in support of the paper 'Analysis of an interface stabilised finite element method: The advectiondiffusionreaction equation', by Garth N. Wells 
Supporting material for the paper 'Analysis of an interface stabilised finite element method: The advectiondiffusionreaction equation'
Wells, G N (20101020)Supporting computer code for the paper 'Analysis of an interface stabilised finite element method: The advectiondiffusionreaction equation', by Garth N. Wells. 
Supporting material for the paper 'Automated Modelling of Evolving Discontinuities'
Nikbakht, Mehdi; Wells, G N (20090723)This computer code is in support of the paper 'Automated Modelling of Evolving Discontinuities' by Mehdi Nikbakht and Garth N. Wells in the journal Algorithms.