Browsing by Author "Askes, Harm"
Now showing items 1-10 of 10
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A combined rh-adaptive scheme based on domain subdivision. Formulation and linear examples
(Wiley and Sons, 2001-09)
Article
Open AccessAn adaptive scheme is proposed in which the domain is split into two subdomains. One subdomain consists of regions where the discretization is refined with an h-adaptive approach, whereas in the other subdomain node ... -
A general framework for softening regularisation based on gradient elasticity
(2011-05-01)
Article
Open AccessA general non-local approach to regularise strain-softening continua is presented. The key idea is to introduce the gradient-type enrichment at the level of displacements (rather than some internal variable), so the model ... -
A new bipenalty formulation for ensuring time step stability in time domain computational dynamics
(John Wiley & Sons, 2012-04-20)
Article
Open Access -
Adaptive analysis of yield line patterns in plates with the Arbitrary Lagrangian-Eulerian method
(1999-02)
Article
Open AccessPlasticity models provide suitable tools to describe the so-called yield line pattern that occurs with the failure of plates. However, in a Lagrangian description a huge number of finite elements are needed for accurate ... -
Bipenalty method for time domain computational dynamics
(2009-12-11)
Article
Open AccessPenalty functions can be used to add constraints to systems of equations. In computational mechanics, stiffness-type penalties are the common choice. However, in dynamic applications stiffness penalties have the disadvantage ... -
Damage regularisation with inertia gradients
(2012-01-01)
Article
Open AccessA gradient enhanced model is formulated which simulates micro-structurally induced wave dispersion and is capable of achieving mesh objective results when modelling strain-softening materials. Length scale parameters are ... -
Error assessment and mesh adaptivity for regularized continuous failure models
(2009-11-26)
Article
Open AccessThis paper deals with the adaptive finite element analysis of structural failure. A gradient-enhanced damage model has been chosen to simulate material degradation. Since this model is regularized in the post-peak regime, ... -
The bipenalty method for arbitrary multipoint constraints
(John Wiley & Sons, 2013-02-03)
Article
Open AccessIn finite element (FE) analysis, traditional penalty methods impose constraints by adding virtual stiffness to the FE system. In dynamics, this can decrease the critical time step of the system when conditionally stable ... -
The concept of Representative Volume Elements for elastic, hardening and softening materials
(2004)
Conference report
Restricted access - publisher's policyThe concept of the Representative Volume Element (RVE) is analysed in the present paper. For elastic materials, one can determine the size of the RVE. However, for other applications, such as the case of softening materials, ... -
The effects of element shape on the critical time step in explicit time integrators for elasto-dynamics
(John Wiley & Sons, 2015-03-16)
Article
Open AccessIn this paper, the effects of element shape on the critical time step are investigated. The common rule-of-thumb, used in practice, is that the critical time step is set by the shortest distance within an element divided ...
